Dimensional Crossover of Low-Energy Magnetic Excitation for Delafossite Oxide Cu_<1-x>Ag_xCrO_2 with a Spin-3/2 Antiferromagnetic Triangular Sublattice(Condensed matter: structure and mechanical and thermal properties)
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概要
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Dimensional crossover from anisotropic-three-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu_<1-x>Ag_xCrO_2 having a spin-3/2 antiferromagnetic (AF) triangular lattice. The crossover is evidenced by a decrease in AF transition temperature (T_N), distinct 2D magnetic excitations above T_N for Cu_<0.85>Ag_<0.15>CrO_2, a disappearance of a peak of magnetic specific heat (C_<mag>) around T_N, and a successive change from T^3 to T^2 dependence of low-T C_<mag> accompanying a low-T shift of magnetic entropy. These results may suggest a gradual change from AF to spin-liquid like states with an increase in x.
- 社団法人日本物理学会の論文
- 2009-01-15
著者
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TOKURA Yoshinori
Department of Applied Physics, University of Tokyo
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Tokura Yoshinori
Department Of Applied Physics Faculty Of Engineering The University Of Tokyo
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MATSUDA Masaaki
Quantum Beam Science Directorate, Japan Atomic Energy Agency
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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 The University Of Tokyo:multiferroics Project Erato Jst
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KISHIMOTO Taizo
Department of Nano-structures and Advanced Materials, Kagoshima University
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HOKAZONO Takahisa
Department of Nano-structures and Advanced Materials, Kagoshima University
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ONOSE Yoshinori
Department of Applied Physics, The University of Tokyo
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Kishimoto Taizo
Department Of Nano-structures And Advanced Materials Kagoshima University
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Onose Yoshinori
Department Of Applied Physics The University Of Tokyo:multiferroics Project Erato Jst
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Hokazono Takahisa
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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