Two-dimensional antiferromagnetic correlation with spin 1 2 in magnetic susceptibility of (La, Sr)2NiO4

M. Kato; Y. Maeno; T. Fujita

doi:10.1016/0921-4534(91)90060-C

Two-dimensional antiferromagnetic correlation with spin 1 2 in magnetic susceptibility of (La, Sr)₂NiO₄

M. Kato, Y. Maeno, T. Fujita

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

15 Citations (Scopus)

Abstract

Measurements of the magnetic susceptibility χ of nonsuperconducting (La_1-χSr_χ)₂NiO₄ (LSNO) with χ close to 0.5 between 5 and 700 K revealed the presence of a broad peak in the temperature dependence of χ as observed in superconducting (La_1-χSr_χ)₂CuO₄ (LSCO). The broad peak is attributed to the two-dimensional antiferromagnetic (2DAF) correlation between S = 1 2 spins of Ni³⁺ in the low-spin state. However, contrary to LSCO, the peak temperature, T_max, which is related to the correlation energy J, increases with χ for LSNO. In LSNO e_g electrons are distributed to the 3d_x²-_y² and 3d_z² orbitals, both of which are not completely occupied. A strong 2DAF correlation exists among Ni³⁺ spins in a (3d_x²-_y²)¹ configuration. With increasing χ, the fraction of Ni³⁺ ions in the (3d_x²-_y²)¹ configuration increases and the effective J increases. This overlap of the orbital levels appears to play an important role in the absence of superconductivity in LSNO.

Original language	English
Pages (from-to)	533-540
Number of pages	8
Journal	Physica C: Superconductivity and its applications
Volume	176
Issue number	4-6
DOIs	https://doi.org/10.1016/0921-4534(91)90060-C
Publication status	Published - 1991 Jun 1
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "Two-dimensional antiferromagnetic correlation with spin 1 2 in magnetic susceptibility of (La, Sr)2NiO4",

abstract = "Measurements of the magnetic susceptibility χ of nonsuperconducting (La1-χSrχ)2NiO4 (LSNO) with χ close to 0.5 between 5 and 700 K revealed the presence of a broad peak in the temperature dependence of χ as observed in superconducting (La1-χSrχ)2CuO4 (LSCO). The broad peak is attributed to the two-dimensional antiferromagnetic (2DAF) correlation between S = 1 2 spins of Ni3+ in the low-spin state. However, contrary to LSCO, the peak temperature, Tmax, which is related to the correlation energy J, increases with χ for LSNO. In LSNO eg electrons are distributed to the 3dx2-y2 and 3dz2 orbitals, both of which are not completely occupied. A strong 2DAF correlation exists among Ni3+ spins in a (3dx2-y2)1 configuration. With increasing χ, the fraction of Ni3+ ions in the (3dx2-y2)1 configuration increases and the effective J increases. This overlap of the orbital levels appears to play an important role in the absence of superconductivity in LSNO.",

author = "M. Kato and Y. Maeno and T. Fujita",

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T1 - Two-dimensional antiferromagnetic correlation with spin 1 2 in magnetic susceptibility of (La, Sr)2NiO4

AU - Kato, M.

AU - Maeno, Y.

AU - Fujita, T.

PY - 1991/6/1

Y1 - 1991/6/1

N2 - Measurements of the magnetic susceptibility χ of nonsuperconducting (La1-χSrχ)2NiO4 (LSNO) with χ close to 0.5 between 5 and 700 K revealed the presence of a broad peak in the temperature dependence of χ as observed in superconducting (La1-χSrχ)2CuO4 (LSCO). The broad peak is attributed to the two-dimensional antiferromagnetic (2DAF) correlation between S = 1 2 spins of Ni3+ in the low-spin state. However, contrary to LSCO, the peak temperature, Tmax, which is related to the correlation energy J, increases with χ for LSNO. In LSNO eg electrons are distributed to the 3dx2-y2 and 3dz2 orbitals, both of which are not completely occupied. A strong 2DAF correlation exists among Ni3+ spins in a (3dx2-y2)1 configuration. With increasing χ, the fraction of Ni3+ ions in the (3dx2-y2)1 configuration increases and the effective J increases. This overlap of the orbital levels appears to play an important role in the absence of superconductivity in LSNO.

AB - Measurements of the magnetic susceptibility χ of nonsuperconducting (La1-χSrχ)2NiO4 (LSNO) with χ close to 0.5 between 5 and 700 K revealed the presence of a broad peak in the temperature dependence of χ as observed in superconducting (La1-χSrχ)2CuO4 (LSCO). The broad peak is attributed to the two-dimensional antiferromagnetic (2DAF) correlation between S = 1 2 spins of Ni3+ in the low-spin state. However, contrary to LSCO, the peak temperature, Tmax, which is related to the correlation energy J, increases with χ for LSNO. In LSNO eg electrons are distributed to the 3dx2-y2 and 3dz2 orbitals, both of which are not completely occupied. A strong 2DAF correlation exists among Ni3+ spins in a (3dx2-y2)1 configuration. With increasing χ, the fraction of Ni3+ ions in the (3dx2-y2)1 configuration increases and the effective J increases. This overlap of the orbital levels appears to play an important role in the absence of superconductivity in LSNO.

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