Physical Properties of SuperconductivityNo Access

THEORETICAL STUDIES OF THE ZERO-FIELD SPLITTING AND g FACTOR FOR Gd³⁺ IN La_2-xSr_xCuO₄

Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

International Centre for Materials Physics, Chinese Academy of Sciences, Shenyang 110016, P. R. China

Corresponding author. Corresponding address: Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China.

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H. M. ZHANG

Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

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G. D. LU

Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

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, and

J. S. YAO

Department of Applied Physics, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China

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https://doi.org/10.1142/S0217979207044317Cited by:0 (Source: Crossref)

Abstract

The zero-field splitting D of the ⁸S_7/2 ground singlet for the tetragonal Gd³⁺ center in La_2-xSr_xCuO₄ is theoretically studied from the superposition model. Meanwhile, the g factor is also quantitatively investigated from the approximation formula including admixture of the ground ⁸S_7/2 and the excited ⁶L_7/2 (L=P, D, F, G) states via the spin-orbit coupling interactions. The calculated zero-field splitting and g factor are in reasonable agreement with the experimental data. It is found that the significant zero-field splitting can be ascribed to the average impurity-ligand bonding angles [≈ (θ₁ + θ₂)/2 ≈ 62°] related to the four-fold axis larger than that (≈ 54.74°) of the cubic case. Nevertheless, the experimental g factor close to 2 may be largely due to the very slight admixture of the ground ⁸S_7/2 and the excited ⁶L_7/2 states via the spin-orbit coupling interactions.

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