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    Title: Effect of Cr deficiency on physical properties of triangular-lattice antiferromagnets CuCr1−xO2 (0 ≦ x ≦ 0.10)
    Authors: Ling, D. C.;Chiang, C. W.;Wang, Y. F.;Lee Y. J.;Yeh, Ping-Hung
    Contributors: 淡江大學物理學系
    Date: 2011-04
    Issue Date: 2012-02-09 14:47:29 (UTC+8)
    Publisher: College Park: American Institute of Physics
    Abstract: 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.
    Relation: Journal of Applied Physics 109(7), 07D908(3pages)
    DOI: 10.1063/1.3544498
    Appears in Collections:[物理學系暨研究所] 期刊論文

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