Impurity effects on the Ni3+ triangular lattice of Ag 2NiO2

H. Yoshida; Y. Muraoka; Z. Hiroi

doi:10.1088/0953-8984/19/14/145235

Impurity effects on the Ni³⁺ triangular lattice of Ag ₂NiO₂

H. Yoshida, Y. Muraoka, Z. Hiroi

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

Abstract

Silver oxonickelate Ag₂NiO₂ is a metallic compound presenting a spin-1/2 triangular lattice. It exhibits a structural transition at T_s ≤ 260K, which may be related to e_g orbital ordering, and an antiferromagnetic transition at T_N ≤ 55K. Impurity effects on its magnetic and electronic properties are examined by substituting Fe for Ni in Ag₂Ni_1-xFe_xO ₂ (0≤x≤0.3). A Curie-like enhancement in magnetic susceptibility is observed at low temperature, which implies that most Fe ³⁺ spins behave as free spins. Moreover, a large enhancement of residual resistivity and its suppression under magnetic fields are observed. Magnetic interactions in the Ni³⁺ triangular lattice are discussed.

Original language	English
Article number	145235
Journal	Journal of Physics Condensed Matter
Volume	19
Issue number	14
DOIs	https://doi.org/10.1088/0953-8984/19/14/145235
Publication status	Published - Apr 11 2007
Externally published	Yes

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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abstract = "Silver oxonickelate Ag2NiO2 is a metallic compound presenting a spin-1/2 triangular lattice. It exhibits a structural transition at Ts ≤ 260K, which may be related to eg orbital ordering, and an antiferromagnetic transition at TN ≤ 55K. Impurity effects on its magnetic and electronic properties are examined by substituting Fe for Ni in Ag2Ni1-xFexO 2 (0≤x≤0.3). A Curie-like enhancement in magnetic susceptibility is observed at low temperature, which implies that most Fe 3+ spins behave as free spins. Moreover, a large enhancement of residual resistivity and its suppression under magnetic fields are observed. Magnetic interactions in the Ni3+ triangular lattice are discussed.",

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N2 - Silver oxonickelate Ag2NiO2 is a metallic compound presenting a spin-1/2 triangular lattice. It exhibits a structural transition at Ts ≤ 260K, which may be related to eg orbital ordering, and an antiferromagnetic transition at TN ≤ 55K. Impurity effects on its magnetic and electronic properties are examined by substituting Fe for Ni in Ag2Ni1-xFexO 2 (0≤x≤0.3). A Curie-like enhancement in magnetic susceptibility is observed at low temperature, which implies that most Fe 3+ spins behave as free spins. Moreover, a large enhancement of residual resistivity and its suppression under magnetic fields are observed. Magnetic interactions in the Ni3+ triangular lattice are discussed.

AB - Silver oxonickelate Ag2NiO2 is a metallic compound presenting a spin-1/2 triangular lattice. It exhibits a structural transition at Ts ≤ 260K, which may be related to eg orbital ordering, and an antiferromagnetic transition at TN ≤ 55K. Impurity effects on its magnetic and electronic properties are examined by substituting Fe for Ni in Ag2Ni1-xFexO 2 (0≤x≤0.3). A Curie-like enhancement in magnetic susceptibility is observed at low temperature, which implies that most Fe 3+ spins behave as free spins. Moreover, a large enhancement of residual resistivity and its suppression under magnetic fields are observed. Magnetic interactions in the Ni3+ triangular lattice are discussed.

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Impurity effects on the Ni³⁺ triangular lattice of Ag ₂NiO₂

Abstract

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