Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu1-xAgxCrO2 with a spin-3/2 antiferromagnetic triangular sublattice

Tetsuji Okuda; Taizo Kishimoto; Kazuma Uto; Takahisa Hokazono; Yoshinori Onose; Yoshinori Tokura; Ryoichi Kajimoto; Masaaki Matsuda

doi:10.1143/JPSJ.78.013604

Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu_1-xAg_xCrO₂ with a spin-3/2 antiferromagnetic triangular sublattice

Tetsuji Okuda, Taizo Kishimoto, Kazuma Uto, Takahisa Hokazono, Yoshinori Onose, Yoshinori Tokura, Ryoichi Kajimoto, Masaaki Matsuda

IMR - Materials Design Division

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

Dimensional crossover from anisotropic-three-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu _1-xAg_xCrO₂ 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_0.85Ag_0.15CrO₂, a disappearance of a peak of magnetic specific heat (C_mag) around T_N, and a successive change from T³ to T² 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.

Original language	English
Article number	013604
Journal	Journal of the Physical Society of Japan
Volume	78
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.78.013604
Publication status	Published - 2009 Jan

Keywords

Antiferromagnetic triangular lattice
Delafossite
Magnetic frustration

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10.1143/JPSJ.78.013604

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title = "Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu1-xAgxCrO2 with a spin-3/2 antiferromagnetic triangular sublattice",

abstract = "Dimensional crossover from anisotropic-three-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu 1-xAgxCrO2 having a spin-3/2 antiferromagnetic (AF) triangular lattice. The crossover is evidenced by a decrease in AF transition temperature (TN), distinct 2D magnetic excitations above TN for Cu0.85Ag0.15CrO2, a disappearance of a peak of magnetic specific heat (Cmag) around TN, and a successive change from T3 to T2 dependence of low-T Cmag 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.",

keywords = "Antiferromagnetic triangular lattice, Delafossite, Magnetic frustration",

author = "Tetsuji Okuda and Taizo Kishimoto and Kazuma Uto and Takahisa Hokazono and Yoshinori Onose and Yoshinori Tokura and Ryoichi Kajimoto and Masaaki Matsuda",

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T1 - Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu1-xAgxCrO2 with a spin-3/2 antiferromagnetic triangular sublattice

AU - Okuda, Tetsuji

AU - Kishimoto, Taizo

AU - Uto, Kazuma

AU - Hokazono, Takahisa

AU - Onose, Yoshinori

AU - Tokura, Yoshinori

AU - Kajimoto, Ryoichi

AU - Matsuda, Masaaki

PY - 2009/1

Y1 - 2009/1

N2 - Dimensional crossover from anisotropic-three-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu 1-xAgxCrO2 having a spin-3/2 antiferromagnetic (AF) triangular lattice. The crossover is evidenced by a decrease in AF transition temperature (TN), distinct 2D magnetic excitations above TN for Cu0.85Ag0.15CrO2, a disappearance of a peak of magnetic specific heat (Cmag) around TN, and a successive change from T3 to T2 dependence of low-T Cmag 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.

AB - Dimensional crossover from anisotropic-three-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu 1-xAgxCrO2 having a spin-3/2 antiferromagnetic (AF) triangular lattice. The crossover is evidenced by a decrease in AF transition temperature (TN), distinct 2D magnetic excitations above TN for Cu0.85Ag0.15CrO2, a disappearance of a peak of magnetic specific heat (Cmag) around TN, and a successive change from T3 to T2 dependence of low-T Cmag 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.

KW - Antiferromagnetic triangular lattice

KW - Delafossite

KW - Magnetic frustration

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Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu_1-xAg_xCrO₂ with a spin-3/2 antiferromagnetic triangular sublattice

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Keywords

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