LOW-FREQUENCY SPIN DYNAMICS IN UNDOPED AND SR-DOPED LA2CUO4

被引:266
作者
IMAI, T
SLICHTER, CP
YOSHIMURA, K
KOSUGE, K
机构
[1] UNIV ILLINOIS,DEPT PHYS,LOOMIS LAB PHYS,URBANA,IL 61801
[2] UNIV ILLINOIS,DEPT CHEM,URBANA,IL 61801
[3] UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801
[4] KYOTO UNIV,FAC SCI,DEPT CHEM,KYOTO 606,JAPAN
关键词
D O I
10.1103/PhysRevLett.70.1002
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report Cu-63 NQR and NMR studies of low frequency spin dynamics in the paramagnetic state of La2-xSrxCuO4 for 0 less-than-or-equal-to x less-than-or-equal-to 0.15 in the temperature range up to 900 K. For x = 0, the results were in good agreement with the theoretical predictions for an S = 1/2 two-dimensional quantum Heisenberg antiferromagnet. For Sr-doped samples, we found that d spins exhibit, above 300 K, the.characteristic behavior expected for a local moment system even for the highest-T(c) phase La1.85Sr0.15CuO4, and cross over to an itinerant regime before superconductivity sets in.
引用
收藏
页码:1002 / 1005
页数:4
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