Quantum HeisenbergS=1/2 spin glass with ferromagnetic coupling and random Dzyaloshinskii-Moriya interactions |
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Authors: | Y -S Xiong L Yi K -L Yao Z -G Li |
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Institution: | (1) Physics Department of Huazhong, University of Science and Technology, 430074 Wuhan, People's Republic of China;(2) Chinese Center for Advanced Science and Technology (World Laboratory), P.O. Box 8730, 100080 Beijing;(3) International Center for Material Physics, Chinese Academy Sinica, 110015 Shenyang;(4) National Laboratory of Laser Technology, 430074 Wuhan, People's Republic of China |
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Abstract: | By means of the generalized static replica symmetric spin glass theory, a quantum HeisenbergS=1/2 spin glass model with the infinite-ranged random Dzyaloshinskii-Moriya (DM) interaction and ferromagnetic coupling is investigated. The dependence of entropy, specific heat, susceptibility and the corresponding order parameters on temperature is studied numerically for different ferromagnetic interactions and fixed anisotropy. Two spin glass phases has been found including transverse and mixed spin glass phases. It has been shown that the local susceptibility exhibits double-cusp features for different ferromagnetic coupling (J
0). Phase transition poins are found in the specific heat-temperature plane at various ferromagnetic coupling values. Additionally, the dependence of the spontaneous moment on temperature is calculated. |
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Keywords: | 75 10 Nr 75 50 Lk 75 30 Gw 75 40 Gx |
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