TY  - JOUR
AU  - Wu, Xueliang
AU  - Hu, Zhixiang
AU  - Graf, David
AU  - Liu, Yu
AU  - Deng, Chaoyue
AU  - Fu, Huixia
AU  - Kundu, Asish K.
AU  - Valla, Tonica
AU  - Petrović, Čedomir
AU  - Wang, Aifeng
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12448
AB  - We report a comprehensive study of magnetotransport properties, angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations on self-flux grown LaAuSb2 single crystals. Resistivity and Hall measurements reveal a charge density wave (CDW) transition at 77 K. MR and de Haas-van Alphen measurements indicate that the transport properties of LaAuSb2 are dominated by Dirac fermions that arise from Sb square nets. ARPES measurements and DFT calculations reveal an electronic structure with a common feature of the square-net-based topological semimetals, which is in good agreement with the magnetotransport properties. Our results indicate the coexistence of CDW and Dirac fermion in LaAuSb2, both of which are linked to the bands arising from the Sb square net, suggesting that the square net could serve as a structural motif to explore various electronic orders.
T2  - Physical Review B
T1  - Coexistence of Dirac fermion and charge density wave in the square-net-based semimetal LaAuSb2
VL  - 108
IS  - 24
DO  - 10.1103/PhysRevB.108.245156
ER  - 

@article{
author = "Wu, Xueliang and Hu, Zhixiang and Graf, David and Liu, Yu and Deng, Chaoyue and Fu, Huixia and Kundu, Asish K. and Valla, Tonica and Petrović, Čedomir and Wang, Aifeng",
year = "2023",
abstract = "We report a comprehensive study of magnetotransport properties, angle-resolved photoemission spectroscopy (ARPES), and density functional theory (DFT) calculations on self-flux grown LaAuSb2 single crystals. Resistivity and Hall measurements reveal a charge density wave (CDW) transition at 77 K. MR and de Haas-van Alphen measurements indicate that the transport properties of LaAuSb2 are dominated by Dirac fermions that arise from Sb square nets. ARPES measurements and DFT calculations reveal an electronic structure with a common feature of the square-net-based topological semimetals, which is in good agreement with the magnetotransport properties. Our results indicate the coexistence of CDW and Dirac fermion in LaAuSb2, both of which are linked to the bands arising from the Sb square net, suggesting that the square net could serve as a structural motif to explore various electronic orders.",
journal = "Physical Review B",
title = "Coexistence of Dirac fermion and charge density wave in the square-net-based semimetal LaAuSb2",
volume = "108",
number = "24",
doi = "10.1103/PhysRevB.108.245156"
}

Wu, X., Hu, Z., Graf, D., Liu, Y., Deng, C., Fu, H., Kundu, A. K., Valla, T., Petrović, Č.,& Wang, A.. (2023). Coexistence of Dirac fermion and charge density wave in the square-net-based semimetal LaAuSb2. in Physical Review B, 108(24).
https://doi.org/10.1103/PhysRevB.108.245156

Wu X, Hu Z, Graf D, Liu Y, Deng C, Fu H, Kundu AK, Valla T, Petrović Č, Wang A. Coexistence of Dirac fermion and charge density wave in the square-net-based semimetal LaAuSb2. in Physical Review B. 2023;108(24).
doi:10.1103/PhysRevB.108.245156 .

Wu, Xueliang, Hu, Zhixiang, Graf, David, Liu, Yu, Deng, Chaoyue, Fu, Huixia, Kundu, Asish K., Valla, Tonica, Petrović, Čedomir, Wang, Aifeng, "Coexistence of Dirac fermion and charge density wave in the square-net-based semimetal LaAuSb2" in Physical Review B, 108, no. 24 (2023),
https://doi.org/10.1103/PhysRevB.108.245156 . .

TY  - JOUR
AU  - Liu, Yu
AU  - Wang, Aifeng
AU  - Ivanovski, Valentin N.
AU  - Du, Qianheng
AU  - Koteski, Vasil J.
AU  - Petrović, Čedomir
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10174
AB  - We report thermoelectric studies of FeS1-xSex (x=0,0.06) superconducting single crystals that feature high irreversibility fields and critical current density Jc comparable to materials with much higher superconducting critical temperatures (Tc's). The ratio of Tc to the Fermi temperature TF is very small, indicating weak electronic correlations. With a slight selenium substitution on sulfur site in FeS both Tc/TF and the effective mass m∗ rise considerably, implying increase in electronic correlation of the bulk conducting states. The first-principle calculations show rise of the density of states at the Fermi level in FeS0.94Se0.06 when compared to FeS, which is related not only to Fe but also to chalcogen-derived electronic states.
T2  - Physical Review B
T1  - Thermoelectricity and electronic correlation enhancement in FeS by light Se doping
VL  - 105
IS  - 4
SP  - 045133
DO  - 10.1103/PhysRevB.105.045133
ER  - 

@article{
author = "Liu, Yu and Wang, Aifeng and Ivanovski, Valentin N. and Du, Qianheng and Koteski, Vasil J. and Petrović, Čedomir",
year = "2022",
abstract = "We report thermoelectric studies of FeS1-xSex (x=0,0.06) superconducting single crystals that feature high irreversibility fields and critical current density Jc comparable to materials with much higher superconducting critical temperatures (Tc's). The ratio of Tc to the Fermi temperature TF is very small, indicating weak electronic correlations. With a slight selenium substitution on sulfur site in FeS both Tc/TF and the effective mass m∗ rise considerably, implying increase in electronic correlation of the bulk conducting states. The first-principle calculations show rise of the density of states at the Fermi level in FeS0.94Se0.06 when compared to FeS, which is related not only to Fe but also to chalcogen-derived electronic states.",
journal = "Physical Review B",
title = "Thermoelectricity and electronic correlation enhancement in FeS by light Se doping",
volume = "105",
number = "4",
pages = "045133",
doi = "10.1103/PhysRevB.105.045133"
}

Liu, Y., Wang, A., Ivanovski, V. N., Du, Q., Koteski, V. J.,& Petrović, Č.. (2022). Thermoelectricity and electronic correlation enhancement in FeS by light Se doping. in Physical Review B, 105(4), 045133.
https://doi.org/10.1103/PhysRevB.105.045133

Liu Y, Wang A, Ivanovski VN, Du Q, Koteski VJ, Petrović Č. Thermoelectricity and electronic correlation enhancement in FeS by light Se doping. in Physical Review B. 2022;105(4):045133.
doi:10.1103/PhysRevB.105.045133 .

Liu, Yu, Wang, Aifeng, Ivanovski, Valentin N., Du, Qianheng, Koteski, Vasil J., Petrović, Čedomir, "Thermoelectricity and electronic correlation enhancement in FeS by light Se doping" in Physical Review B, 105, no. 4 (2022):045133,
https://doi.org/10.1103/PhysRevB.105.045133 . .

TY  - JOUR
AU  - Wang, Aifeng
AU  - Milosavljević, Ana
AU  - Abeykoon, A. M. Milinda
AU  - Ivanovski, Valentin N.
AU  - Du, Qianheng
AU  - Baum, Andreas
AU  - Stavitski, Eli
AU  - Liu, Yu
AU  - Lazarević, Nenad
AU  - Attenkofer, Klaus
AU  - Hackl, Rudi
AU  - Popović, Zoran
AU  - Petrović, Čedomir
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10380
AB  - Connections between crystal chemistry and critical temperature Tc have been in the focus of superconductivity, one of the most widely studied phenomena in physics, chemistry, and materials science alike. In most Fe-based superconductors, materials chemistry and physics conspire so that Tc correlates with the average anion height above the Fe plane, i.e., with the geometry of the FeAs4 or FeCh4 (Ch = Te, Se, or S) tetrahedron. By synthesizing Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1), we find that in alloyed crystals Tc is not correlated with the anion height like it is for most other Fe superconductors. Instead, changes in Tc(x) and tetragonal-to-orthorhombic (nematic) transition Ts(x) upon cooling are correlated with disorder in Fe vibrations in the direction orthogonal to Fe planes, along the crystallographic c-axis. The disorder stems from the random nature of S substitution, causing deformed Fe(Se,S)4 tetrahedra with different Fe–Se and Fe–S bond distances. Our results provide evidence of Tc and Ts suppression by disorder in anion height. The connection to local crystal chemistry may be exploited in computational prediction of new superconducting materials with FeSe/S building blocks.
T2  - Inorganic Chemistry
T1  - Suppression of Superconductivity and Nematic Order in Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder
VL  - 61
IS  - 29
SP  - 11036
EP  - 11045
DO  - 10.1021/acs.inorgchem.2c00568
ER  - 

@article{
author = "Wang, Aifeng and Milosavljević, Ana and Abeykoon, A. M. Milinda and Ivanovski, Valentin N. and Du, Qianheng and Baum, Andreas and Stavitski, Eli and Liu, Yu and Lazarević, Nenad and Attenkofer, Klaus and Hackl, Rudi and Popović, Zoran and Petrović, Čedomir",
year = "2022",
abstract = "Connections between crystal chemistry and critical temperature Tc have been in the focus of superconductivity, one of the most widely studied phenomena in physics, chemistry, and materials science alike. In most Fe-based superconductors, materials chemistry and physics conspire so that Tc correlates with the average anion height above the Fe plane, i.e., with the geometry of the FeAs4 or FeCh4 (Ch = Te, Se, or S) tetrahedron. By synthesizing Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1), we find that in alloyed crystals Tc is not correlated with the anion height like it is for most other Fe superconductors. Instead, changes in Tc(x) and tetragonal-to-orthorhombic (nematic) transition Ts(x) upon cooling are correlated with disorder in Fe vibrations in the direction orthogonal to Fe planes, along the crystallographic c-axis. The disorder stems from the random nature of S substitution, causing deformed Fe(Se,S)4 tetrahedra with different Fe–Se and Fe–S bond distances. Our results provide evidence of Tc and Ts suppression by disorder in anion height. The connection to local crystal chemistry may be exploited in computational prediction of new superconducting materials with FeSe/S building blocks.",
journal = "Inorganic Chemistry",
title = "Suppression of Superconductivity and Nematic Order in Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder",
volume = "61",
number = "29",
pages = "11036-11045",
doi = "10.1021/acs.inorgchem.2c00568"
}

Wang, A., Milosavljević, A., Abeykoon, A. M. M., Ivanovski, V. N., Du, Q., Baum, A., Stavitski, E., Liu, Y., Lazarević, N., Attenkofer, K., Hackl, R., Popović, Z.,& Petrović, Č.. (2022). Suppression of Superconductivity and Nematic Order in Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder. in Inorganic Chemistry, 61(29), 11036-11045.
https://doi.org/10.1021/acs.inorgchem.2c00568

Wang A, Milosavljević A, Abeykoon AMM, Ivanovski VN, Du Q, Baum A, Stavitski E, Liu Y, Lazarević N, Attenkofer K, Hackl R, Popović Z, Petrović Č. Suppression of Superconductivity and Nematic Order in Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder. in Inorganic Chemistry. 2022;61(29):11036-11045.
doi:10.1021/acs.inorgchem.2c00568 .

Wang, Aifeng, Milosavljević, Ana, Abeykoon, A. M. Milinda, Ivanovski, Valentin N., Du, Qianheng, Baum, Andreas, Stavitski, Eli, Liu, Yu, Lazarević, Nenad, Attenkofer, Klaus, Hackl, Rudi, Popović, Zoran, Petrović, Čedomir, "Suppression of Superconductivity and Nematic Order in Fe1–ySe1–xSx (0 ≤ x ≤ 1; y ≤ 0.1) Crystals by Anion Height Disorder" in Inorganic Chemistry, 61, no. 29 (2022):11036-11045,
https://doi.org/10.1021/acs.inorgchem.2c00568 . .

TY  - JOUR
AU  - Tian, Jianjun
AU  - Ivanovski, Valentin N.
AU  - Abeykoon, Milinda
AU  - Martin, Rodica M.
AU  - Baranets, Sviatoslav
AU  - Martin, Catalin
AU  - Liu, Yu
AU  - Du, Qianheng
AU  - Wang, Aifeng
AU  - Chen, Shuzhang
AU  - Tong, Xiao
AU  - Zhang, Weifeng
AU  - Bobev, Svilen
AU  - Koteski, Vasil J.
AU  - Petrović, Čedomir
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10108
AB  - Transition metal dichalcogenides attract considerable attention due to a variety of interesting properties, including long-range magnetism in nanocrystals. Here we investigate the magnetic, thermal, and electrical properties of an FeTe2 single crystal with iron vacancy defects. Magnetic measurements show a paramagnetic state and the absence of magnetic order with low anisotropy in the magnetic susceptibility. Fe 3d orbitals are well hybridized, contributing to the bad metal electrical resistivity. Observed thermal conductivity values below room temperature are rather low and comparable to those of high-performance thermoelectric materials. Our results indicate that FeTe2 can form in a highly defective marcasite crystal structure which can be exploited in future materials design.
T2  - Physical Review B
T1  - Absence of long-range magnetic order in Fe1−δ Te2  (δ ≈ 0.1) crystals
VL  - 104
IS  - 22
SP  - 224109
DO  - 10.1103/PhysRevB.104.224109
ER  - 

@article{
author = "Tian, Jianjun and Ivanovski, Valentin N. and Abeykoon, Milinda and Martin, Rodica M. and Baranets, Sviatoslav and Martin, Catalin and Liu, Yu and Du, Qianheng and Wang, Aifeng and Chen, Shuzhang and Tong, Xiao and Zhang, Weifeng and Bobev, Svilen and Koteski, Vasil J. and Petrović, Čedomir",
year = "2021",
abstract = "Transition metal dichalcogenides attract considerable attention due to a variety of interesting properties, including long-range magnetism in nanocrystals. Here we investigate the magnetic, thermal, and electrical properties of an FeTe2 single crystal with iron vacancy defects. Magnetic measurements show a paramagnetic state and the absence of magnetic order with low anisotropy in the magnetic susceptibility. Fe 3d orbitals are well hybridized, contributing to the bad metal electrical resistivity. Observed thermal conductivity values below room temperature are rather low and comparable to those of high-performance thermoelectric materials. Our results indicate that FeTe2 can form in a highly defective marcasite crystal structure which can be exploited in future materials design.",
journal = "Physical Review B",
title = "Absence of long-range magnetic order in Fe1−δ Te2  (δ ≈ 0.1) crystals",
volume = "104",
number = "22",
pages = "224109",
doi = "10.1103/PhysRevB.104.224109"
}

Tian, J., Ivanovski, V. N., Abeykoon, M., Martin, R. M., Baranets, S., Martin, C., Liu, Y., Du, Q., Wang, A., Chen, S., Tong, X., Zhang, W., Bobev, S., Koteski, V. J.,& Petrović, Č.. (2021). Absence of long-range magnetic order in Fe1−δ Te2  (δ ≈ 0.1) crystals. in Physical Review B, 104(22), 224109.
https://doi.org/10.1103/PhysRevB.104.224109

Tian J, Ivanovski VN, Abeykoon M, Martin RM, Baranets S, Martin C, Liu Y, Du Q, Wang A, Chen S, Tong X, Zhang W, Bobev S, Koteski VJ, Petrović Č. Absence of long-range magnetic order in Fe1−δ Te2  (δ ≈ 0.1) crystals. in Physical Review B. 2021;104(22):224109.
doi:10.1103/PhysRevB.104.224109 .

Tian, Jianjun, Ivanovski, Valentin N., Abeykoon, Milinda, Martin, Rodica M., Baranets, Sviatoslav, Martin, Catalin, Liu, Yu, Du, Qianheng, Wang, Aifeng, Chen, Shuzhang, Tong, Xiao, Zhang, Weifeng, Bobev, Svilen, Koteski, Vasil J., Petrović, Čedomir, "Absence of long-range magnetic order in Fe1−δ Te2  (δ ≈ 0.1) crystals" in Physical Review B, 104, no. 22 (2021):224109,
https://doi.org/10.1103/PhysRevB.104.224109 . .

TY  - JOUR
AU  - Tian, Jianjun
AU  - Ivanovski, Valentin N.
AU  - Szalda, David
AU  - Lei, Hechang
AU  - Wang, Aifeng
AU  - Liu, Yu
AU  - Zhang, Weifeng
AU  - Koteski, Vasil J.
AU  - Petrović, Čedomir
PY  - 2019
UR  - http://pubs.acs.org/doi/10.1021/acs.inorgchem.8b03089
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8082
AB  - We report the synthesis and characterization of Fe 0.36(4) Pd 0.64(4) Se 2 with a pyrite-type structure. Fe 0.36(4) Pd 0.64(4) Se 2 was synthesized using ambient pressure flux crystal growth methods even though the space group Pa3 is high-pressure polymorph for both FeSe 2 and PdSe 2 . Combined experimental and theoretical analysis reveal magnetic spin glass state below 23 K in 1000 Oe that stems from random Fe/Pd occupancies on the same atomic site. The frozen-in magnetic randomness contributes significantly to electronic transport. Electronic structure calculations confirm dominant d-electron character of hybridized bands and large density of states near the Fermi level. Flux-grown single crystal alloys in Pd-Fe-Se atomic system therefore open new pathway for exploring different polymorphs in crystal structures and their novel properties. © 2019 American Chemical Society.
T2  - Inorganic Chemistry
T1  - Fe0.36(4)Pd 0.64(4)Se 2 : Magnetic Spin-Glass Polymorph of FeSe2 and PdSe2 Stable at Ambient Pressure
VL  - 58
IS  - 5
SP  - 3107
EP  - 3114
DO  - 10.1021/acs.inorgchem.8b03089
ER  - 

@article{
author = "Tian, Jianjun and Ivanovski, Valentin N. and Szalda, David and Lei, Hechang and Wang, Aifeng and Liu, Yu and Zhang, Weifeng and Koteski, Vasil J. and Petrović, Čedomir",
year = "2019",
abstract = "We report the synthesis and characterization of Fe 0.36(4) Pd 0.64(4) Se 2 with a pyrite-type structure. Fe 0.36(4) Pd 0.64(4) Se 2 was synthesized using ambient pressure flux crystal growth methods even though the space group Pa3 is high-pressure polymorph for both FeSe 2 and PdSe 2 . Combined experimental and theoretical analysis reveal magnetic spin glass state below 23 K in 1000 Oe that stems from random Fe/Pd occupancies on the same atomic site. The frozen-in magnetic randomness contributes significantly to electronic transport. Electronic structure calculations confirm dominant d-electron character of hybridized bands and large density of states near the Fermi level. Flux-grown single crystal alloys in Pd-Fe-Se atomic system therefore open new pathway for exploring different polymorphs in crystal structures and their novel properties. © 2019 American Chemical Society.",
journal = "Inorganic Chemistry",
title = "Fe0.36(4)Pd 0.64(4)Se 2 : Magnetic Spin-Glass Polymorph of FeSe2 and PdSe2 Stable at Ambient Pressure",
volume = "58",
number = "5",
pages = "3107-3114",
doi = "10.1021/acs.inorgchem.8b03089"
}

Tian, J., Ivanovski, V. N., Szalda, D., Lei, H., Wang, A., Liu, Y., Zhang, W., Koteski, V. J.,& Petrović, Č.. (2019). Fe0.36(4)Pd 0.64(4)Se 2 : Magnetic Spin-Glass Polymorph of FeSe2 and PdSe2 Stable at Ambient Pressure. in Inorganic Chemistry, 58(5), 3107-3114.
https://doi.org/10.1021/acs.inorgchem.8b03089

Tian J, Ivanovski VN, Szalda D, Lei H, Wang A, Liu Y, Zhang W, Koteski VJ, Petrović Č. Fe0.36(4)Pd 0.64(4)Se 2 : Magnetic Spin-Glass Polymorph of FeSe2 and PdSe2 Stable at Ambient Pressure. in Inorganic Chemistry. 2019;58(5):3107-3114.
doi:10.1021/acs.inorgchem.8b03089 .

Tian, Jianjun, Ivanovski, Valentin N., Szalda, David, Lei, Hechang, Wang, Aifeng, Liu, Yu, Zhang, Weifeng, Koteski, Vasil J., Petrović, Čedomir, "Fe0.36(4)Pd 0.64(4)Se 2 : Magnetic Spin-Glass Polymorph of FeSe2 and PdSe2 Stable at Ambient Pressure" in Inorganic Chemistry, 58, no. 5 (2019):3107-3114,
https://doi.org/10.1021/acs.inorgchem.8b03089 . .

TY  - JOUR
AU  - Wang, Aifeng
AU  - Wu, Lijun
AU  - Ivanovski, Valentin N.
AU  - Warren, J. B.
AU  - Tian, Jianjun
AU  - Zhu, Yimei
AU  - Petrović, Čedomir
PY  - 2016
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1232
AB  - We report critical current density (J(c)) in tetragonal FeS single crystals, similar to iron-based superconductors with much higher superconducting critical temperatures (T-c). The Jc is enhanced three times by 6% Se doping. We observe scaling of the normalized vortex pinning force as a function of reduced field at all temperatures. Vortex pinning in FeS and FeS0.94Se0.06 shows contribution of core-normal surfacelike pinning. Reduced temperature dependence of J(c) indicates that dominant interaction of vortex cores and pinning centers is via scattering of charge carriers with reduced mean free path (delta l), in contrast to KxFe2-ySe2 where spatial variations in T-c (delta T-c) prevails.
T2  - Physical Review B: Condensed Matter and Materials Physics
T1  - Critical current density and vortex pinning in tetragonal FeS1-xSex (x=0,0.06)
VL  - 94
IS  - 9
DO  - 10.1103/PhysRevB.94.094506
ER  - 

@article{
author = "Wang, Aifeng and Wu, Lijun and Ivanovski, Valentin N. and Warren, J. B. and Tian, Jianjun and Zhu, Yimei and Petrović, Čedomir",
year = "2016",
abstract = "We report critical current density (J(c)) in tetragonal FeS single crystals, similar to iron-based superconductors with much higher superconducting critical temperatures (T-c). The Jc is enhanced three times by 6% Se doping. We observe scaling of the normalized vortex pinning force as a function of reduced field at all temperatures. Vortex pinning in FeS and FeS0.94Se0.06 shows contribution of core-normal surfacelike pinning. Reduced temperature dependence of J(c) indicates that dominant interaction of vortex cores and pinning centers is via scattering of charge carriers with reduced mean free path (delta l), in contrast to KxFe2-ySe2 where spatial variations in T-c (delta T-c) prevails.",
journal = "Physical Review B: Condensed Matter and Materials Physics",
title = "Critical current density and vortex pinning in tetragonal FeS1-xSex (x=0,0.06)",
volume = "94",
number = "9",
doi = "10.1103/PhysRevB.94.094506"
}

Wang, A., Wu, L., Ivanovski, V. N., Warren, J. B., Tian, J., Zhu, Y.,& Petrović, Č.. (2016). Critical current density and vortex pinning in tetragonal FeS1-xSex (x=0,0.06). in Physical Review B: Condensed Matter and Materials Physics, 94(9).
https://doi.org/10.1103/PhysRevB.94.094506

Wang A, Wu L, Ivanovski VN, Warren JB, Tian J, Zhu Y, Petrović Č. Critical current density and vortex pinning in tetragonal FeS1-xSex (x=0,0.06). in Physical Review B: Condensed Matter and Materials Physics. 2016;94(9).
doi:10.1103/PhysRevB.94.094506 .

Wang, Aifeng, Wu, Lijun, Ivanovski, Valentin N., Warren, J. B., Tian, Jianjun, Zhu, Yimei, Petrović, Čedomir, "Critical current density and vortex pinning in tetragonal FeS1-xSex (x=0,0.06)" in Physical Review B: Condensed Matter and Materials Physics, 94, no. 9 (2016),
https://doi.org/10.1103/PhysRevB.94.094506 . .