Magnetism of one-dimensional copper oxides related to HTSC

doi:10.1016/0304-8853(92)90374-W

Journal of Magnetism and Magnetic Materials

Volumes 104–107, Part 2, 2 February 1992, Pages 817-818

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Abstract

Magnetic and electronic properties of two kinds of copper oxides with the linear chains linked by planar CuO₄, Ca ₂CuO₃ and Li₂CuO₂, were investigated by magnetic susceptibility (χ), specific heat (C_p) and XPS measurements. Ca ₂CuO₃ has scarcely any magnetic contribution to χ and C_p in striking contrast with Li₂CuO₂ which shows 3D-AF magnetic ordering at 9.3 K. They are discussed on the linear chain model.

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Measurements of specific heat and DC magnetic susceptibility have been carried out on the antiferromagnetic compound Li₂CuO₂ (T_N=9.3 K). Strong short-range order (SRO) effects have been clearly observed. We report quantitative analyses for the SRO effects which are associated with magnetic low dimensionality. The analysis of the specific heat confirms that the magnetic entropy diminishes 65% above T_N owing to the SRO effects of spins with decreasing temperature. The temperature dependence of the magnetic susceptibility shows a large deviation from the Curie–Weiss law below 180 K. This large SRO effect above T_N has been analysed using the Bethe–Peierls–Weiss method and Li's theory, and the dominant exchange constant with the antiferromagnetic coupling constant has been estimated to be J=−11 to −12 K. The magnetic susceptibilities of the Ni-doped system Li₂Cu_1−xNi_xO₂ (0≤x≤0.2) have also been investigated. The value of T_N decreases with increasing x, and the critical concentration of x_c has a very low value of about 0.13, at which the long-range order disappears. The experimental results of the Li₂Cu_1−xNi_xO₂ system support the magnetic low dimensionality of Li₂CuO₂.
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Magnetism of one-dimensional copper oxides related to HTSC

Abstract

Phys. Rev. B

Z. Anorg. Allg. Chem.

Z. Anorg. Allg. Chem.

Phys. Rev.