THEORY OF THE NON-FERMI-LIQUID TRANSITION POINT IN THE 2-IMPURITY KONDO MODEL

被引:31
作者
SIRE, C [1 ]
VARMA, CM [1 ]
KRISHNAMURTHY, HR [1 ]
机构
[1] INDIAN INST SCI,DEPT PHYS,BANGALORE 560012,KARNATAKA,INDIA
来源
PHYSICAL REVIEW B | 1993年 / 48卷 / 18期
关键词
D O I
10.1103/PhysRevB.48.13833
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We present an explicit solution of the problem of two coupled spin-1/2 impurities, interacting with a band of conduction electrons. We obtain an exact effective bosonized Hamiltonian, which is then treated by two different methods (low-energy theory and mean-field approach). Scale invariance is explicitly shown at the quantum critical point. The staggered susceptibility behaves like ln(T(K)/T) at low T, whereas the magnetic susceptibility and [S1.S2] are well behaved at the transition. The divergence of C(T)/T when approaching the transition point is also studied. The non-Fermi-liquid (actually marginal-Fermi-liquid) critical point is shown to arise because of the existence of anomalous correlations, which lead to degeneracies between bosonic and fermionic states of the system. The methods developed in this paper are of interest for studying more physically relevant models, for instance, for high-T(c) cuprates.
引用
收藏
页码:13833 / 13839
页数:7
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