Effect of Spin Dilution on the Magnetic State of Delafossite CuCrO2 with an S = 3/2 Antiferromagnetic Triangular Sublattice
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概要
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We investigated an effect of spin dilution on the magnetic and thermal properties of delafossite CuCrO2 having an S = 3/2 antiferromagnetic triangular lattice (ATL) by the substitution of Al3+ for Cr3+ by measurements of magnetization, specific heat, and neutron scattering. Spin defects introduced into Cr ATL layers blur the anti ferromagnetic transition and induce a dimensional crossover of low-energy magnetic excitation in the residual Cr ATL region due to the reduction of inter-layer magnetic interaction, while accompanying an enhancement of a spin-glass component. The observed T^{2} contribution to the low-T C_{\text{mag}} above y = 0.15, as well as in Cu0.85Ag0.15CrO2, comes mainly from a short-range 2D AF excitation originating in a nontrivial magnetic state such as spin-nematic or spin-liquid states.
- 2011-01-15
著者
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Seki Shinichiro
Department Of Applied Physics University Of Tokyo
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Okuda Tetsuji
Department Of Nano-structures And Advanced Materials Kagoshima University:presto Jst
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Matsuda Masaaki
Quantum Beam Science Directorate Japan Atomic Energy Agency
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Kajimoto Ryoichi
J-parc Center Japan Atomic Energy Agency
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Uto Kazuma
Department Of Nano-structures And Advanced Materials Kagoshima University
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Tokura Yoshinori
Department Of Applied Physics And Quantum Phase Electronics Center University Of Tokyo
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Onose Yoshinori
Department Of Applied Physics And Quantum Phase Electronics Center University Of Tokyo
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Tokura Yoshinori
Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo, Tokyo 113-8656, Japan
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Kajimoto Ryoichi
J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Onose Yoshinori
Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo, Tokyo 113-8656, Japan
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Seki Shinichiro
Department of Applied Physics, The University of Tokyo, Hongo, Bunkyo, Tokyo 113-8656, Japan
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Uto Kazuma
Department of Nano-Structures and Advanced Materials, Kagoshima University, 1-21-40 Korimoto, Kagohisma 890-0065, Japan
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Seki Shinichiro
Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Bunkyo, Tokyo 113-8656, Japan
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