RANDOM QUANTUM SPIN CHAINS - A REAL-SPACE RENORMALIZATION-GROUP STUDY

被引：76

作者：

WESTERBERG, E

FURUSAKI, A

SIGRIST, M

LEE, PA

机构：

[1] Department of Physics, Massachusetts Institute of Technology, Cambridge

[2] Department of Applied Physics, University of Tokyo, Hongo

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 75卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.75.4302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum Heisenberg spin chains with random couplings and spin sizes are studied using a real-space renormalization group technique. These systems belong to a new universality class of disordered quantum spin systems realized in, e.g., Sr3CuPt1-xIrxO6. The low-energy fixed point is characterized by the formation of weakly coupled large effective spins. At low temperature T the entropy obeys a power law T-delta (delta approximate to 0.44), and the susceptibility follows a Curie-like behavior.

引用

页码：4302 / 4305

页数：4

共 12 条

[1] SCALING STUDIES OF HIGHLY DISORDERED SPIN-1/2 ANTI-FERROMAGNETIC SYSTEMS [J].