Absence of gross static inhomogeneity in cuprate superconductors

被引：51

作者：

Loram, JW

Tallon, JL

Liang, WY

机构：

[1] Univ Cambridge, Interdisciplinary Res Ctr Superconduct, Cambridge CB3 0HE, England

[2] Ind Res Ltd, MacDiarmid Inst Adv Mat & Nanotechnol, Lower Hutt, New Zealand

[3] Univ Victoria, Lower Hutt, New Zealand

来源：

PHYSICAL REVIEW B | 2004年 / 69卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.69.060502

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent scanning tunnelling microscopy (STM) studies on Bi2Sr2CaCu2O8+delta (Bi-2212) revealed the presence of severe inhomogeneity with a length scale L(0)approximate toxi(0), the coherence length. Other studies have been interpreted in terms of mesoscale or nanoscale phase segregation. Here we analyze heat capacity and NMR data on Bi-2212 and (Y,Ca)Ba2Cu3O7-delta and find no evidence of phase segregation or gross inhomogeneity. For Bi-2212 the coherence scale L-0 increases with doping from 5xi(0) to 17xi(0) and the hole density inhomogeneity decreases from 0.028 to 0.005 holes/Cu. We conclude that STM measurements considerably overstate the inhomogeneity in bulk Bi-2212.

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页数：4

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