PAULI COUPLING OF THE EXTERNAL MAGNETIC-FIELD TO SPIN-DENSITY WAVES

被引:12
作者
BJELIS, A
ZANCHI, D
机构
[1] Department of Physics, Faculty of Science, University of Zagreb, 41001 Zagreb
来源
PHYSICAL REVIEW B | 1994年 / 49卷 / 09期
关键词
D O I
10.1103/PhysRevB.49.5968
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effects of the external magnetic field on the spin-density-wave (SDW) order and on accompanying fluctuations are calculated within the random-phase approximation for the extended Hubbard model with imperfectly nested quasi-one-dimenisonal Fermi surfaces. Both Pauli and orbital mechanisms are treated in parallel. It is shown that the Pauli coupling leads to a finite hybridization of the SDW component in the direction of the external field and the charge-density wave. The mean value of this SDW component remains zero below the critical temperature in the isotropic system, but may be activated in systems with an internal spin anisotropy. The mean-field expression for the corresponding spin-flop field is derived. Furthermore, the Pauli coupling renormalizes two of six fluctuative SDW modes. In order to establish ways of qualitative and quantitative comparison between effects belonging to the Pauli and orbital couplings, we analyze the characteristic parameters for these two modes as well as for the other four modes affected only by the orbital coupling. In particular we evaluate the field dependence of long-wavelength gaps, correlation lengths, and attenuation coefficients.
引用
收藏
页码:5968 / 5977
页数:10
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