TY  - JOUR
AU  - Martin, Catalin
AU  - Martinez, V. A.
AU  - Opačić, Marko R.
AU  - Đurđić-Mijin, Sanja
AU  - Mitrić, Petar
AU  - Umićević, Ana
AU  - Poudel, A.
AU  - Sydoryk, Ihor
AU  - Ren, Weijun
AU  - Martin, Ruaridh M.
AU  - Tanner, David B.
AU  - Lazarević, Nenad
AU  - Petrović, Čedomir
AU  - Tanasković, Darko
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10987
AB  - Intermetallic narrow-gap semiconductors have been intensively explored due to their large thermoelectric power at low temperatures and a possible role of strong electronic correlations in their unusual thermodynamic and transport properties. Here we study the optical spectra and vibrational properties of FeGa3 single crystal. The optical conductivity indicates that FeGa3 has a direct band gap of ≈0.7 eV, consistent with density functional theory (DFT) calculations. Most importantly, we find a substantial spectral weight also below 0.4 eV, which is the energy of the indirect (charge) gap found in resistivity measurements and ab initio calculations. We find that the spectral weight below the gap decreases with increasing temperature, which indicates that it originates from the impurity states and not from the electronic correlations. Interestingly, we did not find any signatures of the impurity states in vibrational spectra. The infrared and Raman vibrational lines are narrow and weakly temperature dependent. The vibrational frequencies are in excellent agreement with our DFT calculations, implying a modest role of electronic correlations. Narrow Mössbauer spectral lines also indicate high crystallinity of the sample. © 2023 American Physical Society.
T2  - Physical Review B
T1  - Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3
VL  - 107
IS  - 16
DO  - 10.1103/PhysRevB.107.165151
ER  - 

@article{
author = "Martin, Catalin and Martinez, V. A. and Opačić, Marko R. and Đurđić-Mijin, Sanja and Mitrić, Petar and Umićević, Ana and Poudel, A. and Sydoryk, Ihor and Ren, Weijun and Martin, Ruaridh M. and Tanner, David B. and Lazarević, Nenad and Petrović, Čedomir and Tanasković, Darko",
year = "2023",
abstract = "Intermetallic narrow-gap semiconductors have been intensively explored due to their large thermoelectric power at low temperatures and a possible role of strong electronic correlations in their unusual thermodynamic and transport properties. Here we study the optical spectra and vibrational properties of FeGa3 single crystal. The optical conductivity indicates that FeGa3 has a direct band gap of ≈0.7 eV, consistent with density functional theory (DFT) calculations. Most importantly, we find a substantial spectral weight also below 0.4 eV, which is the energy of the indirect (charge) gap found in resistivity measurements and ab initio calculations. We find that the spectral weight below the gap decreases with increasing temperature, which indicates that it originates from the impurity states and not from the electronic correlations. Interestingly, we did not find any signatures of the impurity states in vibrational spectra. The infrared and Raman vibrational lines are narrow and weakly temperature dependent. The vibrational frequencies are in excellent agreement with our DFT calculations, implying a modest role of electronic correlations. Narrow Mössbauer spectral lines also indicate high crystallinity of the sample. © 2023 American Physical Society.",
journal = "Physical Review B",
title = "Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3",
volume = "107",
number = "16",
doi = "10.1103/PhysRevB.107.165151"
}

Martin, C., Martinez, V. A., Opačić, M. R., Đurđić-Mijin, S., Mitrić, P., Umićević, A., Poudel, A., Sydoryk, I., Ren, W., Martin, R. M., Tanner, D. B., Lazarević, N., Petrović, Č.,& Tanasković, D.. (2023). Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3. in Physical Review B, 107(16).
https://doi.org/10.1103/PhysRevB.107.165151

Martin C, Martinez VA, Opačić MR, Đurđić-Mijin S, Mitrić P, Umićević A, Poudel A, Sydoryk I, Ren W, Martin RM, Tanner DB, Lazarević N, Petrović Č, Tanasković D. Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3. in Physical Review B. 2023;107(16).
doi:10.1103/PhysRevB.107.165151 .

Martin, Catalin, Martinez, V. A., Opačić, Marko R., Đurđić-Mijin, Sanja, Mitrić, Petar, Umićević, Ana, Poudel, A., Sydoryk, Ihor, Ren, Weijun, Martin, Ruaridh M., Tanner, David B., Lazarević, Nenad, Petrović, Čedomir, Tanasković, Darko, "Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3" in Physical Review B, 107, no. 16 (2023),
https://doi.org/10.1103/PhysRevB.107.165151 . .

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 . .