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

相关论文

共 32 条

[21] Unusual dispersion and line shape of the superconducting state spectra of Bi2Sr2CaCu2O8+delta [J].

Norman, MR ;

Ding, H ;

Campuzano, JC ;

Takeuchi, T ;

Randeria, M ;

Yokoya, T ;

Takahashi, T ;

Mochiku, T ;

Kadowaki, K .

PHYSICAL REVIEW LETTERS, 1997, 79 (18) :3506-3509

[22] Collective modes and the superconducting-state spectral function of Bi2Sr2CaCu2O8 [J].

Norman, MR ;

Ding, H .

PHYSICAL REVIEW B, 1998, 57 (18) :R11089-R11092

[23] VACUUM TUNNELING SPECTROSCOPY AND ASYMMETRIC DENSITY-OF-STATES OF BI2SR2CACU2O8+DELTA [J].

RENNER, C ;

FISCHER, O .

PHYSICAL REVIEW B, 1995, 51 (14) :9208-9218

[24] Oxygen doping and temperature dependence of the tunneling spectroscopy on Bi2Sr2CaCu2O8+delta [J].

Renner, C ;

Revaz, B ;

Genoud, JY ;

Fischer, O .

JOURNAL OF LOW TEMPERATURE PHYSICS, 1996, 105 (5-6) :1083-1089

[25] Pseudogap precursor of the superconducting gap in under- and overdoped Bi2Sr2CaCu2O8+δ [J].

Renner, C ;

Revaz, B ;

Genoud, JY ;

Kadowaki, K ;

Fischer, O .

PHYSICAL REVIEW LETTERS, 1998, 80 (01) :149-152

[26] Observation of the low temperature pseudogap in the vortex cores of Bi2Sr2CaCu2O8+δ [J].

Renner, C ;

Revaz, B ;

Kadowaki, K ;

Maggio-Aprile, I ;

Fischer, O .

PHYSICAL REVIEW LETTERS, 1998, 80 (16) :3606-3609

[27] Weak pseudogap behavior in the underdoped cuprate superconductors [J].

Schmalian, J ;

Pines, D ;

Stojkovic, B .

PHYSICAL REVIEW LETTERS, 1998, 80 (17) :3839-3842

[28]

Schrieffer J. R., 1964, THEORY SUPERCONDUCTI

[29] THEORY OF ELECTRON TUNNELING [J].

SCHRIEFFER, JR .

REVIEWS OF MODERN PHYSICS, 1964, 36 (1P1) :200-&

[30] Quasiparticle tunneling spectra of the high-Tc mercury cuprates:: Implications of the d-wave two-dimensional van Hove scenario [J].

Wei, JYT ;

Tsuei, CC ;

van Bentum, PJM ;

Xiong, Q ;

Chu, CW ;

Wu, MK .

PHYSICAL REVIEW B, 1998, 57 (06) :3650-3662

← 1 2 3 4 →