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Magnetic-field-induced spin crossover of Y-doped Pr0.7Ca0.3CoO3
http://hdl.handle.net/2261/60904
http://hdl.handle.net/2261/6090405bbc7b1-8706-40bb-896d-d7b529f34990
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
PhysRevB.94.115129.pdf (580.5 kB)
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2017-01-10 | |||||
| タイトル | ||||||
| タイトル | Magnetic-field-induced spin crossover of Y-doped Pr0.7Ca0.3CoO3 | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源 | http://purl.org/coar/resource_type/c_6501 | |||||
| タイプ | journal article | |||||
| 著者 |
Ikeda, Akihiko
× Ikeda, Akihiko× Lee, Suyeon× Terashima, Taku T.× Matsuda, Yasuhiro H.× Tokunaga, Masashi× Naito, Tomoyuki |
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| 著者所属 | ||||||
| 著者所属 | Institute for Solid State Physics, University of Tokyo | |||||
| 著者所属 | ||||||
| 著者所属 | Faculty of Science and Engineering, Iwate University | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The family of hole-doped Pr-based perovskite cobaltites, Pr0.5Ca0.5CoO3 and (Pr1−yREy)0.3Ca0.7CoO3 (where RE is rare earth), has recently been found to exhibit simultaneous metal-insulator, spin-state, and valence transitions. We have investigated magnetic-field-induced phase transitions of (Pr1−yYy)0.7Ca0.3CoO3 by means of magnetization measurements at 4.2–100 K up to an ultrahigh magnetic field of 140 T with the chemical pressure varied by y=0.0625, 0.075, 0.1. The observed magnetic-field-induced transitions were found to occur simultaneously with the metal-insulator transitions up to 100 T. The obtained magnetic-field-temperature (B−T) phase diagram and magnetization curves are well analyzed by a spin-crossover model of a single ion with interion interactions. On the other hand, the chemical pressure dependence of the experimentally obtained magnetization change during the phase transition disagrees with the single-ion model when approaching low temperatures. The significant y dependence of the magnetization change at low temperatures may arise from the itinerant magnetism of Co3+ in the paramagnetic metallic phase, where the chemical pressure enhances the exchange splitting by promoting the double-exchange interaction. The observed B−T phase diagrams of (Pr1−yYy)0.7Ca0.3CoO3 are quite contrary to that of LaCoO3, indicating that in (Pr1−yYy)0.7Ca0.3CoO3 the high-field phase possesses higher entropy than the low-field phase, whereas it is the other way around in LaCoO3. | |||||
| 書誌情報 |
Physical Review B 巻 94, 号 11, 発行日 2016-09-13 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1550235X | |||||
| DOI | ||||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | info:doi/10.1103/PhysRevB.94.115129 | |||||
| 権利 | ||||||
| 権利情報 | ©2016 American Physical Society | |||||
| 著者版フラグ | ||||||
| 値 | publisher | |||||
| 出版者 | ||||||
| 出版者 | American Physical Society | |||||
| 異版である | ||||||
| 関連タイプ | isVersionOf | |||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://dx.doi.org/10.1103/PhysRevB.94.115129 | |||||
