Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3
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2023
Authors
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

Article (Published version)

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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.
Source:
Physical Review B, 2023, 107, 16Funding / projects:
- National Natural Science Foundation of China [Grants No. 51671192 and No. 51531008]
- e Ministry of Science, Technological Development, and Innovation of the Republic of Serbia
- Vinca Institute of Nuclear Sciences, through an agreement ˇ with the Ministry of Science, Technological Development, and Innovation of the Republic of Serbia
Institution/Community
VinčaTY - 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 . .