RAMAN INVESTIGATION OF THE SUPERCONDUCTING GAP OF YBA2CU3OX FOR 6.85-LESS-THAN-X-LESS-THAN-7.0

被引：34

作者：

ALTENDORF, E ^{[1
]}

IRWIN, JC ^{[1
]}

LIANG, R ^{[1
]}

HARDY, WN ^{[1
]}

机构：

[1] UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.45.7551

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature dependences of the linewidth and frequency of the 340-cm-1 Raman-active phonon have been measured in five lightly twinned crystals of YBa2Cu3Ox with different oxygen concentrations x. The observed changes in the linewidth and frequency that occur for temperatures below the critical temperature have been found to depend strongly on the value of x within the region 6.85 less-than-or-similar-to x less-than-or-similar-to 7.0. The linewidth and frequency dependences for T < T(c) result in superconducting gap energy estimates which indicate that 2-DELTA decreases for oxygen concentrations x > 6.95 and remains approximately constant for 6.85 less-than-or-similar-to x less-than-or-similar-to 6.95. Given the low level of impurities in these crystals these results are attributed to variations in the hole concentrations which arise primarily from variations in the oxygen content.

引用

页码：7551 / 7554

页数：4

共 24 条

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