Quantum XY spin glass model with planar Dzyaloshinskii-Moriya interactions in longitudinal field*
Department of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China
2 Department of Physics, The Hong Kong University of Science and Technology, Kowloon, Hong Kong
3 CCAST (World Lab.) P.O. Box 8730, Beijing 100080, and International Center for Material Physics, Academia Sinica, Shenyang 110015, China
Published online: 15 April 1999
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, .
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.)
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1999