Constraints on the quasiparticle density of states in high-Tc superconductors

被引：26
作者：
Cren, T
Roditchev, D
Sacks, W
Klein, J
机构：
[1] Univ Paris 07, CNRS, Phys Solides Grp, Unite Mixte Rech 75 88, F-75251 Paris 5, France
[2] Univ Paris 06, CNRS, Phys Solides Grp, Unite Mixte Rech 75 88, F-75251 Paris 5, France
来源：
EUROPHYSICS LETTERS | 2000年 / 52卷 / 02期
关键词：
D O I：
10.1209/epl/i2000-00424-4
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this letter we present new tunneling data on YBa2Cu3O7 thin films by low-temperature scanning tunneling spectroscopy. Unusual peak-dip-hump features, previously reported in Bi2Sr2CaCu2O8+delta, are also found in YBa2Cu3O7. To analyse these common sig natures, we propose a new heuristic model in which, in addition to thp d-wave symmetry, the gap function is energy dependent. A simple expression for the quasiparticle density of states is derived, giving an excellent agreement with the experiment. The dynamics of the quasiparticle states and the energy scales involved in the superconducting transition are discussed.
引用
收藏
页码：203 / 209
页数：7
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