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Electronic and crystal structures of (Na1−xCax)Cr2O4 with anomalous colossal magnetoresistance
https://repo.qst.go.jp/records/81433
https://repo.qst.go.jp/records/8143346499b96-2f0e-45dc-99c8-b2f828b436f6
| Item type | 学術雑誌論文 / Journal Article(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-12-24 | |||||
| タイトル | ||||||
| タイトル | Electronic and crystal structures of (Na1−xCax)Cr2O4 with anomalous colossal magnetoresistance | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Yamaoka, Hitoshi
× Yamaoka, Hitoshi× F. Schwier, Eike× Yamamoto, Yoshiya× Nakatake, Masashi× Sawada, Masahiro× Sakurai, Hiroya× Tsujii, Naohito× Arita, Masashi× Iwasawa, Hideaki× Taguchi, Munetaka× Shimada, Kenya× Jun’ichiro, Mizuki× Hideaki, Iwasawa |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The electronic and crystal structures of (Na1−xCax)Cr2O4 have been studied in detail by combining photoelectron spectroscopy (PES), x-ray absorption spectroscopy (XAS), and x-ray diffraction (XRD). The PES results suggest a gap opening at the Fermi level with decreasing temperature and/or increasing the Ca concentration. The XAS spectra at the O K-absorption edge suggest a slight increase of the O 2p–Cr 3d hybridization at low temperatures in NaCr2O4 and Na0.8Ca0.2Cr2O4, which corresponds to the appearance of the antiferromagnetic order. However, XRD showed no corresponding structural transition. The experimental results were compared with spin-resolved density functional theory (DFT) calculations. In Na1−xCaxCr2O4 the pre-edge intensity of the XAS spectra at the O K-absorption edge is strongly suppressed with increasing x, in accordance with the gap opening by Ca doping. This observation is consistent with the DFT calculation, where the density of states just above and below the Fermi level diminishes as the electron is doped into NaCr2O4. | |||||
| 書誌情報 |
Physical Review B 巻 102, p. 235150, 発行日 2020-12 |
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| 出版者 | ||||||
| 出版者 | アメリカ物理学会 | |||||
| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 2469-9950 | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.1103/PhysRevB.102.235150 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://journals.aps.org/prb/abstract/10.1103/PhysRevB.102.235150 | |||||
