Collinear order in frustrated quantum antiferromagnet on square lattice (CuBr)LaNb2O7

Noriaki Oba; Hiroshi Kageyama; Taro Kitano; Jun Yasuda; Yoichi Baba; Masakazu Nishi; Kazuma Hirota; Yasuo Narumi; Masayuki Hagiwara; Koichi Kindo; Takashi Saito; Yoshitami Ajiro; Kazuyoshi Yoshimura

doi:10.1143/JPSJ.75.113601

Collinear order in frustrated quantum antiferromagnet on square lattice (CuBr)LaNb₂O₇

Noriaki Oba, Hiroshi Kageyama, Taro Kitano, Jun Yasuda, Yoichi Baba, Masakazu Nishi, Kazuma Hirota, Yasuo Narumi, Masayuki Hagiwara, Koichi Kindo, Takashi Saito, Yoshitami Ajiro, Kazuyoshi Yoshimura

Materials Property Division

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

39 Citations (Scopus)

Abstract

Magnetic susceptibility, heat capacity, high-field magnetization and neutron diffraction measurements have been performed on a two-dimensional S = 1/2 square-lattice system (CuBr)LaNb₂O₇, prepared by a topotactic ion-exchange reaction of a nonmagnetic double-layered perovskite RbLaNb₂O₇. (CuBr)LaNb₂O₇ exhibits a second-order magnetic transition at 32 K, in marked contrast to a spin-singlet nature for its Cl-based counterpart (CuCl)LaNb₂O₇, despite nearly identical structural parameters. The magnetic structure is a novel collinear antiferromagnetic (CAF) ordering characterized by a modulation vector q = (π, 0, π) with a reduced moment of 0.6μ_B. Mixed ferromagnetic nearest-neighbor (J₁) and antiferromagnetic second-nearest-neighbor (J₂) interactions are of comparable strength (J₁/k_B = -35.6K and J₂=k_B = 41.3 K), placing the system in a more frustrated region of the CAF phase than ever reported.

Original language	English
Article number	113601
Journal	journal of the physical society of japan
Volume	75
Issue number	11
DOIs	https://doi.org/10.1143/JPSJ.75.113601
Publication status	Published - 2006 Nov

Keywords

(CuBr)LaNbO
Collinear order
Frustration
Ion exchange
J-J model
Square lattice

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.75.113601

Cite this

Collinear order in frustrated quantum antiferromagnet on square lattice (CuBr)LaNb₂O₇. / Oba, Noriaki; Kageyama, Hiroshi; Kitano, Taro; Yasuda, Jun; Baba, Yoichi; Nishi, Masakazu; Hirota, Kazuma; Narumi, Yasuo; Hagiwara, Masayuki; Kindo, Koichi; Saito, Takashi; Ajiro, Yoshitami; Yoshimura, Kazuyoshi.

In: journal of the physical society of japan, Vol. 75, No. 11, 113601, 11.2006.

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

Oba, Noriaki ; Kageyama, Hiroshi ; Kitano, Taro ; Yasuda, Jun ; Baba, Yoichi ; Nishi, Masakazu ; Hirota, Kazuma ; Narumi, Yasuo ; Hagiwara, Masayuki ; Kindo, Koichi ; Saito, Takashi ; Ajiro, Yoshitami ; Yoshimura, Kazuyoshi. / Collinear order in frustrated quantum antiferromagnet on square lattice (CuBr)LaNb₂O₇. In: journal of the physical society of japan. 2006 ; Vol. 75, No. 11.

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abstract = "Magnetic susceptibility, heat capacity, high-field magnetization and neutron diffraction measurements have been performed on a two-dimensional S = 1/2 square-lattice system (CuBr)LaNb2O7, prepared by a topotactic ion-exchange reaction of a nonmagnetic double-layered perovskite RbLaNb2O7. (CuBr)LaNb2O7 exhibits a second-order magnetic transition at 32 K, in marked contrast to a spin-singlet nature for its Cl-based counterpart (CuCl)LaNb2O7, despite nearly identical structural parameters. The magnetic structure is a novel collinear antiferromagnetic (CAF) ordering characterized by a modulation vector q = (π, 0, π) with a reduced moment of 0.6μB. Mixed ferromagnetic nearest-neighbor (J1) and antiferromagnetic second-nearest-neighbor (J2) interactions are of comparable strength (J1/kB = -35.6K and J2=kB = 41.3 K), placing the system in a more frustrated region of the CAF phase than ever reported.",

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author = "Noriaki Oba and Hiroshi Kageyama and Taro Kitano and Jun Yasuda and Yoichi Baba and Masakazu Nishi and Kazuma Hirota and Yasuo Narumi and Masayuki Hagiwara and Koichi Kindo and Takashi Saito and Yoshitami Ajiro and Kazuyoshi Yoshimura",

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AU - Narumi, Yasuo

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AB - Magnetic susceptibility, heat capacity, high-field magnetization and neutron diffraction measurements have been performed on a two-dimensional S = 1/2 square-lattice system (CuBr)LaNb2O7, prepared by a topotactic ion-exchange reaction of a nonmagnetic double-layered perovskite RbLaNb2O7. (CuBr)LaNb2O7 exhibits a second-order magnetic transition at 32 K, in marked contrast to a spin-singlet nature for its Cl-based counterpart (CuCl)LaNb2O7, despite nearly identical structural parameters. The magnetic structure is a novel collinear antiferromagnetic (CAF) ordering characterized by a modulation vector q = (π, 0, π) with a reduced moment of 0.6μB. Mixed ferromagnetic nearest-neighbor (J1) and antiferromagnetic second-nearest-neighbor (J2) interactions are of comparable strength (J1/kB = -35.6K and J2=kB = 41.3 K), placing the system in a more frustrated region of the CAF phase than ever reported.

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