NEUTRON SPECTROSCOPIC EVIDENCE FOR CLUSTER FORMATION AND PERCOLATIVE SUPERCONDUCTIVITY IN PR2-XCEXCUO4-DELTA (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.2)

被引：25

作者：

HENGGELER, W ^{[1
]}

CUNTZE, G ^{[1
]}

MESOT, J ^{[1
]}

KLAUDA, M ^{[1
]}

SAEMANNISCHENKO, G ^{[1
]}

FURRER, A ^{[1
]}

机构：

[1] UNIV ERLANGEN NURNBERG,INST PHYS,D-91058 ERLANGEN,GERMANY

来源：

EUROPHYSICS LETTERS | 1995年 / 29卷 / 03期

关键词：

D O I：

10.1209/0295-5075/29/3/008

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We used neutron crystal field spectroscopy as a local probe to investigate cluster formations in the electron-doped compound Pr2-xCexCuO4-delta. The observed energy spectra were indeed found to result from a superposition of three different components which we interpret in terms of local regions of undoped, intermediately doped and highly doped character. The volume fraction of the doped clusters is shown to reach the percolation limit for x approximate to 0.14 where the onset of superconductivity is observed. The highly doped clusters are presumably controlled by a charge transfer mechanism.

引用

页码：233 / 238

页数：6

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