NEUTRON SPECTROSCOPIC EVIDENCE FOR CLUSTER FORMATION AND PERCOLATIVE SUPERCONDUCTIVITY IN ERBA2CU3OX

被引：131

作者：

MESOT, J ^{[1
]}

ALLENSPACH, P ^{[1
]}

STAUB, U ^{[1
]}

FURRER, A ^{[1
]}

MUTKA, H ^{[1
]}

机构：

[1] INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 70卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.70.865

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Inelastic neutron scattering has been employed to study in detail the low-energy crystal-field excitations of Er3+ in ErBa2Cu3Ox (6 < x < 7). The observed energy spectra are found to be the result of a superposition of three stable states, which we interpret in terms of local regions of semiconducting and metallic character. The superconductivity is shown to result from the formation of a two-dimensional percolative network. A two-dimensional bond percolation model correctly predicts the critical oxygen contents associated with the two-plateau structure of T(c).

引用

页码：865 / 868

页数：4

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