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Quantum XY spin glass model with planar Dzyaloshinskii-Moriya interactions in longitudinal field |
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| Authors: | Y Shang L Yi K Yao |
| Institution: | (1) Department of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China, CN;(2) Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, CN;(3) CCAST (World Lab.) P.O. Box 8730, Beijing 100080, and International Center for Material Physics, Academia Sinica, Shenyang 110015, China, CN |
| Abstract: | In the replica symmetric approximation and static limit in Matsubara “imaginary time”, the quantum XY spin glass model with planar Dzyaloshinskii-Moriya interaction in longitudinal field is investigated. Several thermodynamic quantities are calculated numerically as well as spin self-interaction and spin glass order parameter for spin S=1/2. It is shown that the entropy is not independent of the field. A crossover behavior of the specific heat depending on temperature is found. There is a deviation from the parabolic approximation, C/T=A+Bh 2 . Received 11 March 1998 |
| Keywords: | PACS 75 10 Nr Spin-glass and other random models - 75 50 Lk Magnetic phase boundaries (including magnetic transitions metamagnetism etc ) - 75 30 Gw Magnetic anisotropy - 75 40 Cx Static properties (order parameter static susceptibility heat capacities critical exponents etc ) |
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