Near-Infrared Reflectivity of Superconducting FeSe Thin Films
We present an investigation on the intrinsic optical properties of superconducting FeSe thin films deposited on CaF<sub>2</sub> substrates. It is found that the samples respond strongly to the near-infrared (NIR) irradiation in different temperature regimes. Thus, we are able to measure...
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IEEE
2019-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8691687/ |
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| author | Yanmin Zhang Wen Xu Zhongpei Feng Zefeng Lin Kui Jin Jie Zhang Shun Zhou Zhaojun Liu Chen Guan Tiandi Chen Junqi Wang Lan Ding Sasa Zhang |
| author_facet | Yanmin Zhang Wen Xu Zhongpei Feng Zefeng Lin Kui Jin Jie Zhang Shun Zhou Zhaojun Liu Chen Guan Tiandi Chen Junqi Wang Lan Ding Sasa Zhang |
| author_sort | Yanmin Zhang |
| collection | DOAJ |
| description | We present an investigation on the intrinsic optical properties of superconducting FeSe thin films deposited on CaF<sub>2</sub> substrates. It is found that the samples respond strongly to the near-infrared (NIR) irradiation in different temperature regimes. Thus, we are able to measure the optical reflectivity of the in-plane (ab-plane) thin films from room temperature to 5 K. A critical behavior near the superconducting transition temperature (<italic>T</italic><sub>c</sub>∼10 K) can be observed optically in the temperature-dependent reflectivity spectrum. We carry out the Kramers–Kronig analysis of the experimental data and discuss the basic optical properties of superconducting FeSe thin films in different structural phases above and below the transition temperature <italic>T</italic><sub>s</sub>∼100 K. By fitting experimental data with the Drude–Smith and Drude–Lorentz formulas, we obtain the key sample parameters such as the electronic relaxation time and dc conductivity. The interesting and important findings obtained from this study not only shed new light on the pairing mechanism in FeSe but also demonstrate that the NIR reflection experiment is a powerful and convenient optical technique for contactless characterization and investigation of superconducting thin film materials. |
| format | Article |
| id | doaj-art-ccf314bcc2c3482c9add586f2ed59b0e |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-ccf314bcc2c3482c9add586f2ed59b0e2025-08-20T03:33:11ZengIEEEIEEE Photonics Journal1943-06552019-01-011131910.1109/JPHOT.2019.29106688691687Near-Infrared Reflectivity of Superconducting FeSe Thin FilmsYanmin Zhang0https://orcid.org/0000-0003-3147-8018Wen Xu1Zhongpei Feng2Zefeng Lin3Kui Jin4Jie Zhang5Shun Zhou6Zhaojun Liu7https://orcid.org/0000-0003-3502-9666Chen Guan8Tiandi Chen9Junqi Wang10Lan Ding11https://orcid.org/0000-0002-7423-2061Sasa Zhang12School of Information Science and Engineering, Shandong University, Jinan, ChinaKey Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, ChinaNational Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing, ChinaNational Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing, ChinaNational Laboratory for Superconductivity, Institute of Physics, Chinese Academy of Sciences, Beijing, ChinaSchool of Physics and Astronomy, Key Laboratory of Quantum Information of Yunnan Province, Yunnan University, Kunming, ChinaSchool of Physics and Astronomy, Key Laboratory of Quantum Information of Yunnan Province, Yunnan University, Kunming, ChinaSchool of Information Science and Engineering, Shandong University, Jinan, ChinaSchool of Information Science and Engineering, Shandong University, Jinan, ChinaSchool of Information Science and Engineering, Shandong University, Jinan, ChinaSchool of Information Science and Engineering, Shandong University, Jinan, ChinaSchool of Physics and Astronomy, Key Laboratory of Quantum Information of Yunnan Province, Yunnan University, Kunming, ChinaSchool of Information Science and Engineering, Shandong University, Jinan, ChinaWe present an investigation on the intrinsic optical properties of superconducting FeSe thin films deposited on CaF<sub>2</sub> substrates. It is found that the samples respond strongly to the near-infrared (NIR) irradiation in different temperature regimes. Thus, we are able to measure the optical reflectivity of the in-plane (ab-plane) thin films from room temperature to 5 K. A critical behavior near the superconducting transition temperature (<italic>T</italic><sub>c</sub>∼10 K) can be observed optically in the temperature-dependent reflectivity spectrum. We carry out the Kramers–Kronig analysis of the experimental data and discuss the basic optical properties of superconducting FeSe thin films in different structural phases above and below the transition temperature <italic>T</italic><sub>s</sub>∼100 K. By fitting experimental data with the Drude–Smith and Drude–Lorentz formulas, we obtain the key sample parameters such as the electronic relaxation time and dc conductivity. The interesting and important findings obtained from this study not only shed new light on the pairing mechanism in FeSe but also demonstrate that the NIR reflection experiment is a powerful and convenient optical technique for contactless characterization and investigation of superconducting thin film materials.https://ieeexplore.ieee.org/document/8691687/Infraredreflectionthin filmsoptical propertiesspectrum analysis |
| spellingShingle | Yanmin Zhang Wen Xu Zhongpei Feng Zefeng Lin Kui Jin Jie Zhang Shun Zhou Zhaojun Liu Chen Guan Tiandi Chen Junqi Wang Lan Ding Sasa Zhang Near-Infrared Reflectivity of Superconducting FeSe Thin Films IEEE Photonics Journal Infrared reflection thin films optical properties spectrum analysis |
| title | Near-Infrared Reflectivity of Superconducting FeSe Thin Films |
| title_full | Near-Infrared Reflectivity of Superconducting FeSe Thin Films |
| title_fullStr | Near-Infrared Reflectivity of Superconducting FeSe Thin Films |
| title_full_unstemmed | Near-Infrared Reflectivity of Superconducting FeSe Thin Films |
| title_short | Near-Infrared Reflectivity of Superconducting FeSe Thin Films |
| title_sort | near infrared reflectivity of superconducting fese thin films |
| topic | Infrared reflection thin films optical properties spectrum analysis |
| url | https://ieeexplore.ieee.org/document/8691687/ |
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