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

Martin, Catalin; Martinez, V. A.; Opačić, Marko; Djurdjić-Mijin, Sanja; Mitrić, Petar; Umićević, Ana B.; Poudel, Aashish; Sydoryk, Ihor; Ren, Weijun; Martin, Rodica M.; Tanner, David B.; Lazarević, Nenad; Petrovic, Cedomir; Tanasković, Darko

doi:10.1103/physrevb.107.165151

Title: Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa 3

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 FeGa 3 . The optical conductivity indicates that FeGa 3 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 highmore » crystallinity of the sample.« less

Authors:

^[1]; Martinez, V. A. ^[2];

^[3];

^[1];

^[4];

^[5];

^[2];

^[3];

^[6];

^[3]

Ramapo College of New Jersey, Mahwah, NJ (United States)
University of Florida, Gainesville, FL (United States)
University of Belgrade (Serbia)
Brookhaven National Laboratory (BNL), Upton, NY (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Montclair State University, NJ (United States)
Brookhaven National Laboratory (BNL), Upton, NY (United States)

Publication Date:: Wed Apr 26 00:00:00 EDT 2023

Research Org.:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Contributing Org.:: National Natural Science Foundation of China, Beijing (China)

OSTI Identifier:: 1985786

Alternate Identifier(s):: OSTI ID: 1972743

Report Number(s):: BNL-224519-2023-JAAM
Journal ID: ISSN 2469-9950; TRN: US2402693

Grant/Contract Number:: SC0012704; 51671192; 51531008

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review. B

Additional Journal Information:: Journal Volume: 107; Journal Issue: 16; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Electronic structure; Optical conductivity; Intermetallic semiconductors; Mössbauer spectroscopy; Optical spectroscopy; Raman spectroscopy

Citation Formats


                    Martin, Catalin, Martinez, V. A., Opačić, Marko, Djurdjić-Mijin, Sanja, Mitrić, Petar, Umićević, Ana B., Poudel, Aashish, Sydoryk, Ihor, Ren, Weijun, Martin, Rodica M., Tanner, David B., Lazarević, Nenad, Petrovic, Cedomir, and Tanasković, Darko. Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3.  United States: N. p., 2023. 
Web.  doi:10.1103/physrevb.107.165151.

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                    Martin, Catalin, Martinez, V. A., Opačić, Marko, Djurdjić-Mijin, Sanja, Mitrić, Petar, Umićević, Ana B., Poudel, Aashish, Sydoryk, Ihor, Ren, Weijun, Martin, Rodica M., Tanner, David B., Lazarević, Nenad, Petrovic, Cedomir, & Tanasković, Darko. Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3.  United States.  https://doi.org/10.1103/physrevb.107.165151

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                    Martin, Catalin, Martinez, V. A., Opačić, Marko, Djurdjić-Mijin, Sanja, Mitrić, Petar, Umićević, Ana B., Poudel, Aashish, Sydoryk, Ihor, Ren, Weijun, Martin, Rodica M., Tanner, David B., Lazarević, Nenad, Petrovic, Cedomir, and Tanasković, Darko. Wed .  
"Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3".  United States.  https://doi.org/10.1103/physrevb.107.165151.  https://www.osti.gov/servlets/purl/1985786.

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@article{osti_1985786,

  title        = {Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa3},

  author       = {Martin, Catalin and Martinez, V. A. and Opačić, Marko and Djurdjić-Mijin, Sanja and Mitrić, Petar and Umićević, Ana B. and Poudel, Aashish and Sydoryk, Ihor and Ren, Weijun and Martin, Rodica M. and Tanner, David B. and Lazarević, Nenad and Petrovic, Cedomir and Tanasković, Darko},

  abstractNote = {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. 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.},

  doi          = {10.1103/physrevb.107.165151},

  journal      = {Physical Review. B},

  number       = 16,

  volume       = 107,

  place        = {United States},

  year         = {Wed Apr 26 00:00:00 EDT 2023},

  month        = {Wed Apr 26 00:00:00 EDT 2023}

}

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Title: Optical conductivity and vibrational spectra of the narrow-gap semiconductor FeGa 3

Abstract

Citation Formats

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