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Yokoya T, Yoshida R, Utsumi Y, Tsubota K, Okazaki H, Wakita T, Mizuguchi Y, Takano Y, Muro T, Kato Y, Kumigashira H, Oshima M, Harima H, Aiura Y, Sato H, Ino A, Namatame H, Taniguchi M, Hirai M, Muraoka Y. Te concentration dependent photoemission and inverse-photoemission study of FeSe 1-xTe x. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2012; 13:054403. [PMID: 27877521 PMCID: PMC5099622 DOI: 10.1088/1468-6996/13/5/054403] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2012] [Accepted: 11/05/2012] [Indexed: 06/03/2023]
Abstract
We have characterized the electronic structure of FeSe1-x Te x for various x values using soft x-ray photoemission spectroscopy (SXPES), high-resolution photoemission spectroscopy (HRPES) and inverse photoemission spectroscopy (IPES). The SXPES valence band spectral shape shows that the 2 eV feature in FeSe, which was ascribed to the lower Hubbard band in previous theoretical studies, becomes less prominent with increasing x. HRPES exhibits systematic x dependence of the structure near the Fermi level (EF): its splitting near EF and filling of the pseudogap in FeSe. IPES shows two features, near EF and approximately 6 eV above EF; the former may be related to the Fe 3d states hybridized with chalcogenide p states, while the latter may consist of plane-wave-like and Se d components. In the incident electron energy dependence of IPES, the density of states near EF for FeSe and FeTe has the Fano lineshape characteristic of resonant behavior. These compounds exhibit different resonance profiles, which may reflect the differences in their electronic structures. By combining the PES and IPES data the on-site Coulomb energy was estimated at 3.5 eV for FeSe.
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Affiliation(s)
- Takayoshi Yokoya
- The Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency, Okayama 700-8530, Japan
- Research Laboratory for Surface Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
| | - Rikiya Yoshida
- The Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
| | - Yuki Utsumi
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Koji Tsubota
- The Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
| | - Hiroyuki Okazaki
- The Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
- Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency, Okayama 700-8530, Japan
| | - Takanori Wakita
- The Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency, Okayama 700-8530, Japan
- Research Laboratory for Surface Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
| | - Yoshikazu Mizuguchi
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
- University of TsukubaGraduate School of Pure and Applied Sciences, Tsukuba, Ibaraki 305-8577, Japan
| | - Yoshihiko Takano
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
- University of TsukubaGraduate School of Pure and Applied Sciences, Tsukuba, Ibaraki 305-8577, Japan
| | - Takayuki Muro
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Yukako Kato
- Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, Japan
| | - Hiroshi Kumigashira
- Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency, Okayama 700-8530, Japan
- Department of Applied Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Masaharu Oshima
- Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency, Okayama 700-8530, Japan
- Department of Applied Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hisatomo Harima
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- Department of Physics, Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan
| | - Yoshihiro Aiura
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan
| | - Hitoshi Sato
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan
| | - Akihiro Ino
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Hirofumi Namatame
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan
| | - Masaki Taniguchi
- Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
- Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashihiroshima, Hiroshima 739-0046, Japan
| | - Masaaki Hirai
- The Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency, Okayama 700-8530, Japan
- Research Laboratory for Surface Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
| | - Yuji Muraoka
- The Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
- Japan Science and Technology Agency-Transformative Research Project on Iron Pnictides (JST-TRIP), Tsukuba, Ibaraki 305-0047, Japan
- Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency, Okayama 700-8530, Japan
- Research Laboratory for Surface Science, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530, Japan
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