| 標題：Effect of Cr deficiency on physical properties of triangular-lattice antiferromagnets CuCr1−xO2 (0 ≦ x ≦ 0.10) |
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| 學年 | 99 |
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| 學期 | 2 |
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| 出版（發表）日期 | 2011/04/01 |
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| 作品名稱 | Effect of Cr deficiency on physical properties of triangular-lattice antiferromagnets CuCr1−xO2 (0 ≦ x ≦ 0.10) |
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| 作品名稱（其他語言） | |
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| 著者 | Ling, D. C.; Chiang, C. W.; Wang, Y. F.; Lee Y. J.; Yeh, Ping-Hung |
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| 單位 | 淡江大學物理學系 |
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| 出版者 | College Park: American Institute of Physics |
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| 著錄名稱、卷期、頁數 | Journal of Applied Physics 109(7), 07D908(3pages) |
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| 摘要 | Structural, transport, and magnetoelectric (ME) properties of delafossite oxides CuCr1-xO2 with 0 <= x <= 0.10 were extensively investigated. The Rietveld refinement shows that the Cu-O bond length decreases with increasing Cr deficiency, indicative of the presence of a mixed valence state of Cu+/Cu2+ and an enhancement of the hybridization between Cu 3d and O 2p orbitals. As a result, it leads to a decrease of room-temperature resistivity by two orders of magnitude. The deduced effective moment for the Cr-deficient samples is larger than the one only taking into account the contribution from Cr3+ with S = 3/2. This demonstrates that Cu2+ is present in the Cr-deficient samples, giving rise to excess holes at the Cu site. Below TN(Cr) ∼ 24 K, the magnetocapacitance [[variant_greek_epsilon](H)-[variant_greek_epsilon](0)]/[variant_greek_epsilon](0) exhibits a distinct field dependence and deviates from the square of magnetization M2. These findings suggest that the ME coupling in CuCr1-xO2 with higher x is modulated by an increase of the spin fluctuations in the CrO2 triangular lattice through the interplay between charge and spin degrees of freedom. |
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| 關鍵字 | |
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| 語言 | 英文 |
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| ISSN | 0021-8979; 1089-7550 |
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| 期刊性質 | 國外 |
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| 產學合作 | |
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| 通訊作者 | Ling, D. C. |
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| 審稿制度 | |
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| 國別 | 美國 |
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| 公開徵稿 | |
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| 出版型式 | 紙本;電子版 |
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| 相關連結 | |
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