MEAN-FIELD THEORY OF THE SPIRAL PHASES OF A DOPED ANTIFERROMAGNET

被引:182
作者
KANE, CL
LEE, PA
NG, TK
CHAKRABORTY, B
READ, N
机构
[1] MIT,DEPT PHYS,CAMBRIDGE,MA 02139
[2] YALE UNIV,DEPT APPL PHYS,NEW HAVEN,CT 06520
来源
PHYSICAL REVIEW B | 1990年 / 41卷 / 04期
关键词
D O I
10.1103/PhysRevB.41.2653
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We develop a Schwinger boson-slave fermion mean-field theory for the t-t-J model, where t represents same sublattice hopping. In an expansion for small hole concentration, , we show that doping favors a spiral distortion of the spins in which the antiferromagnetic order parameter spirals with a wave vector proportional to . In addition, we point out the novel possibility of a double spiral state which has isotropic spin correlations, is disordered for arbitrarily small , and exhibits a staggered chiral order. The relationship with resonating-valence-bond theory and the implications for neutron scattering experiments are discussed. © 1990 The American Physical Society.
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页码:2653 / 2656
页数:4
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