PHONON SELF-ENERGY EFFECTS DUE TO SUPERCONDUCTIVITY - EVIDENCE FOR THE STRONG-COUPLING LIMIT IN YBA2CU3O7-DELTA

被引：106

作者：

ZEYHER, R ^{[1
]}

ZWICKNAGL, G ^{[1
]}

机构：

[1] TH DARMSTADT,INST FESTKORPERPHYS,D-6100 DARMSTADT,FED REP GER

来源：

SOLID STATE COMMUNICATIONS | 1988年 / 66卷 / 06期

关键词：

PHONONS - SUPERCONDUCTIVITY - YTTRIUM COMPOUNDS - Electric Conductivity;

D O I：

10.1016/0038-1098(88)90220-7

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The self-energy of phonons due to superconductivity is calculated in the weak and the strong coupling limit. Applying the theory to YBa//2Cu//3O//7// minus // delta we find the following results: a) The signs of the observed yields q equals 0 phonon shifts due to superconductivity disagree in general with the predictions of the weak-coupling case; this result suggests that electronic transitions are not responsible for the electron pairing; b) the magnitude of the observed shifts (as well as the value of T//c) can consistently and semi-quantitatively be explained by assuming the strong-coupling limit with lambda approximately 2. 9.

引用

页码：617 / 622

页数：6

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