Asymmetry of critical exponents in YBa2Cu3O7-δ

被引：11

作者：

Charalambous, M ^{[1
]}

Riou, O ^{[1
]}

Gandit, P ^{[1
]}

Billon, B ^{[1
]}

Lejay, P ^{[1
]}

Chaussy, J ^{[1
]}

Hardy, WN ^{[1
]}

Bonn, DA ^{[1
]}

Liang, RX ^{[1
]}

机构：

[1] Univ Grenoble 1, CNRS, Ctr Rech Tres Basses Temp, F-38042 Grenoble 09, France

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.83.2042

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The critical behavior of YBa2Cu3O7-delta close to the zero field superconducting critical point (T-c = 92 K) was investigated using a high precision, high resolution microcalorimeter and detwinned single crystals with mu g mass. A detailed analysis of the specific heat reveals a pronounced asymmetry of the critical exponent a above and below T-c: alpha(+) = 0.5 +/- 0.2, alpha(-) = -0.2 +/- 0.3, which does not heal for different choices of the critical temperature T-c or the phonon background C-p, and persists in the overdoped regime. This abnormal behavior cannot be explained within the framework of regular second order phase transitions.

引用

页码：2042 / 2045

页数：4

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[1] Comment on "Asymmetry of critical exponents in YBa2Cu3O7-δ"
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