Large isotope effect on the pseudogap in the high-temperature superconductor HoBa2Cu4O8

被引：179

作者：

Temprano, DR ^{[1
]}

Mesot, J

Janssen, S

Conder, K

Furrer, A

Mutka, H

Müller, KA

机构：

[1] Swiss Fed Inst Technol, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[2] PSI Villigen, CH-5232 Villigen, Switzerland

[3] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[4] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.84.1990

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The oxygen isotope effect on the relaxation rate of crystal-field excitations in the slightly underdoped high-temperature superconductor HoBa2Cu4O8 has been investigated by means of inelastic neutron scattering. For the O-16 compound there is clear evidence for the opening of an electronic Sap in the normal state at T* approximate to 170 K far above T-c = 79 K. Upon oxygen isotope substitution (O-16 vs O-18) T-c decreases marginally to 78.5 K, whereas T* is shifted to about 220 K. This huge isotope shift observed for T* which is absent in NMR and NQR experiments suggests that the mechanism leading to an isotope effect on the pseudogap has to involve a time scale in the range 10(-8) much greater than tau > 10(-13) s.

引用

页码：1990 / 1993

页数：4

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