Quantum melting of magnetic order due to orbital fluctuations

被引：261
作者：
Feiner, LF
Oles, AM
Zaanen, J
机构：
[1] MAX PLANCK INST FESTKORPERFORSCH,D-70569 STUTTGART,GERMANY
[2] LEIDEN UNIV,INST LORENTZ,NL-2300 RA LEIDEN,NETHERLANDS
[3] JAGIELLONIAN UNIV,INST PHYS,PL-30059 KRAKOW,POLAND
来源：
PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 14期
关键词：
INSULATING PHASE; ANTIFERROMAGNETS; TRANSITION; MODEL; LATTICE; V2O3;
D O I：
10.1103/PhysRevLett.78.2799
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have studied the phase diagram and excitations of the spin-orbital model derived for a three-dimensional perovskite lattice, as in KCuF3. The results demonstrate that the orbital degeneracy drastically increases quantum fluctuations and suppresses the classical long-range order near the multicritical point in the mean-field phase diagram. This indicates the presence of a quantum liquid state, and we present explicit evidence for valence bond type correlations in three dimensions.
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页码：2799 / 2802
页数：4
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