Anomalous Effect of Magnetic Field on the Low-Temperature Thermal Expansion of the Bi2Sr2-xLaxCuO6+δ and Nd2-xCexCuO4-δ HTSC Systems in the Non-Superconducting Phase

被引：2

作者：

Krynetskii, I. B. ^{[3
]}

Krapf, A. ^{[2
]}

Martovitskii, V. P. ^{[1
]}

Shabanova, N. P. ^{[1
]}

Gavrilkin, S. Yu. ^{[1
]}

Kovalenko, V. I. ^{[1
]}

Rusakov, A. P. ^{[4
]}

Golovashkin, A. I. ^{[1
]}

机构：

[1] Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia

[2] Humboldt Univ, Inst Physik, D-12489 Berlin, Germany

[3] Moscow MV Lomonosov State Univ, Moscow 119991, Russia

[4] Natl Univ Sci & Technol MISIS, Moscow 119049, Russia

来源：

BULLETIN OF THE LEBEDEV PHYSICS INSTITUTE | 2011年 / 38卷 / 12期

基金：

俄罗斯基础研究基金会;

关键词：

high-temperature superconductors; anomalous thermal expansion; charge density wave; fluctuation superconductivity; SINGLE-CRYSTAL; T-C; DIFFRACTION; CROSSOVER;

D O I：

10.3103/S1068335611120013

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The thermal expansion of single crystals of the Bi2Sr2-xLaxCuO6+delta high-temperature superconducting (HTSC) system in the insulating phase with compositions having no superconducting transition to a temperature of 1.8 K (x >= 0.8) is measured in an arbitrary direction in the (ab) plane in the temperature range of 7-50 K. Temperature regions of material compression upon heating are found. The study of anomalies in magnetic fields of 3 and 6 T, parallel and perpendicular to the c-axis revealed an anisotropic and nonmonotonic effect of the field on thermal expansion. Such anomalies for the n-type Nd2-xCexCuO4-delta HTSC sample also having no superconducting transition are detected for the first time. The results show that the anomaly nature is caused by anisotropic electronic ordering, probably, by the charge density wave in the CuO2 plane and superconductivity fluctuations in the insulating phase.

引用

页码：349 / 353

页数：5

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