EFFECT OF OXYGEN DISORDER ON SUPERCONDUCTIVITY-INDUCED SELF-ENERGY EFFECTS IN IMPURITY-FREE YBA2CU3O7-DELTA

被引：49

作者：

HADJIEV, VG

THOMSEN, C

ERB, A

MULLERVOGT, G

KOBLISCHKA, MR

CARDONA, M

机构：

[1] UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY

[2] MAX PLANCK INST MET RES,W-7000 STUTTGART 80,GERMANY

来源：

SOLID STATE COMMUNICATIONS | 1991年 / 80卷 / 08期

关键词：

D O I：

10.1016/0038-1098(91)90170-Z

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We investigated various areas of impurity-free YBa2Cu3O7-delta single crystals with Raman spectroscopy. A definite correlation between the appearance of the group-theoretically forbidden chain-related Raman lines at 232 and 598 cm-1 and the superconductivity-induced self-energy effects observed for the 340 cm-1 B1g-like mode was established: Disorder in the chains in pure crystals has a similar effect as the introduction of impurity atoms, both leading to an increased gap value for 2-DELTA/kT(c) as deduced from the phonon self-energy effects. The absence of the forbidden chain modes in the Raman spectra may be used as an extremely sensitive quality criterion of impurity-free crystals.

引用

页码：643 / 647

页数：5

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