THE SUPERCONDUCTING GAP AND AN UNIDENTIFIED 110-190-K PHASE OF YBA2CU3O7 OBSERVED BY FAR-INFRARED ELLIPSOMETRY

被引：5

作者：

BARTH, KL

KEILMANN, F

机构：

[1] Max-Planck-Institut für Festkörperforschung, Stuttgart 80, W-7000

来源：

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1993年 / 91卷 / 04期

关键词：

D O I：

10.1007/BF01316818

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have measured the complex dielectric function of pure and Fe-doped YBa2Cu3O7 ceramics, between 10 and 150 cm 1 and 20 and 300 K, with a far-infrared, rotating-analyzer laser ellipsometer. The superconducting phase transition and the gap energy are clearly observable. The undoped ceramic exhibits remarkable dielectric hysteresis between 110 K and 190 K. This points to a still unidentified phase which we observe to be sensitive to a weak magnetic field.

引用

页码：419 / 422

页数：4

共 14 条

[1]

Azzam R. M. A., 1977, ELLIPSOMETRY POLARIZ

[2]

BARTH KL, IN PRESS REV SCI INS

[3]

BAUER M, 1990, THESIS U TUBINGEN

[4] PROPAGATION OF ULTRASONIC-WAVES AND ANOMALIES NEAR TC IN SINGLE CRYSTALLINE YBA2CU3O7-X HIGH-TC SUPERCONDUCTORS [J].