OCCURRENCE OF VANHOVE SINGULARITIES IN YBA2CU4O8 AND YBA2CU3O6.9

被引：125

作者：

GOFRON, K ^{[1
]}

CAMPUZANO, JC ^{[1
]}

DING, H ^{[1
]}

GU, C ^{[1
]}

LIU, R ^{[1
]}

DABROWSKI, B ^{[1
]}

VEAL, BW ^{[1
]}

CRAMER, W ^{[1
]}

JENNINGS, G ^{[1
]}

机构：

[1] ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1993年 / 54卷 / 10期

基金：

美国国家科学基金会;

关键词：

HIGH T(C) SUPERCONDUCTORS; VANHOVE SINGULARITIES; PHOTOEMISSION; ARPES; FERMI SURFACE;

D O I：

10.1016/0022-3697(93)90165-N

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report seeing a saddle point in the energy band, known as a van Hove singularity. We measure an exact position of the singularity in both YBa2Cu4O8 (Y124) and YBa2Cu3O6.9 (Y123). In Y123 the van Hove singularity is at binding energy of less then 10 meV, closer ot E(F), than in Y124, which has a singularity at 19 meV. The singularity has and extended character along the GAMMA-Y direction. Another clearly resolved band exhibits a saddle point singularity at binding energy of 115 meV. Similar singularities are observed in the vicinity of the X point, extended along the GAMMA-X direction. In order to study these features the energy resolution of the system was improved to better than 10 meV.

引用

页码：1193 / 1198

页数：6

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