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

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 21期

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

页码：3355 / 3358

页数：4

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