QUANTUM CRITICAL SCALING IN A MODERATELY DOPED ANTIFERROMAGNET

被引:46
作者
SOKOL, A
GLENISTER, RL
SINGH, RRP
机构
[1] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801
[2] UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616
[3] LD LANDAU INST,MOSCOW,RUSSIA
关键词
D O I
10.1103/PhysRevLett.72.1549
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Using high temperature expansions for the equal time correlator S(q) and static susceptibility chi(q) for the t-J model, we present evidence for quantum critical (QC), z = 1, behavior at intermediate temperatures in a broad range of t/J ratio, doping, and temperatures. We find that the dynamical susceptibility is very close to the universal scaling function computable for the asymptotic QC regime, and that the dominant energy scale is temperature. Our results are in excellent agreement with measurements of the spin-echo decay rate, 1/T2G, in La2CuO4, and provide qualitative understanding of both 1/T1 and 1/T2G nuclear relaxation rates in doped cuprates.
引用
收藏
页码:1549 / 1552
页数:4
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