SUPERPARAMAGNETIC BEHAVIOR IN ND2-XCEXCU(CO-57)O4

被引:31
作者
CHECHERSKY, V
KOPELEV, NS
O, BH
LARKIN, MI
PENG, JL
MARKERT, JT
GREENE, RL
NATH, A
机构
[1] UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712
[2] UNIV MARYLAND,DEPT PHYS,CTR SUPERCONDUCT RES,COLL PK,MD 20742
关键词
D O I
10.1103/PhysRevLett.70.3355
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
As a microprobe of the environment, 20-30 ppm of Co-57 is substituted for Cu in the CuO2 planes of Nd2-xCexCuO4. Mossbauer effect studies show that all the oxygenated and ''deoxygenated'' samples with x=0.00, 0.14, 0.16, and 0.18 contain large proportions of microscopic spin clusters. Even in the deoxygenated ceramic with x=0.16, superconducting regions coexist with about 53% of microscopic spin clusters of typical size approximately 25-250 angstrom. Spin clusters formation is induced by extraneous oxygen. 2D magnetic order in the electron-doped system is much stronger than that in hole-doped systems, with extremely long-lived (> 10(-8) s) spin correlations far above the 3D Neel temperature.
引用
收藏
页码:3355 / 3358
页数:4
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