Pseudogap and order-parameter symmetry in the underdoped high-Tc compounds HoBa2Cu4O8 and Er2Ba4Cu7O14.92:: A neutron crystal-field study

被引：30

作者：

Mesot, J ^{[1
]}

Bottger, G

Mutka, H

Furrer, A

机构：

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

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

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

来源：

EUROPHYSICS LETTERS | 1998年 / 44卷 / 04期

关键词：

D O I：

10.1209/epl/i1998-00501-8

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The temperature dependence of the relaxation rate of crystal-field excitations in the slightly underdoped HoBa(2) Cu(4)O(8) and Er(2)Ba(4)Cu(7)O(14.92) high-temperature superconductors has been investigated by means of neutron scattering measurements. Our data show clear evidence for the opening of an electronic gap in the normal state at T* approximate to 200 K far above T(c). The temperature evolution of the relaxation rate appears to be extremely dependent upon the energy at which the susceptibility is being probed. This points to a strongly anisotropic gap function which is tentatively modelled to be of the form s + id(3), with Delta(s)/Delta(d) approximate to 0.2.

引用

页码：498 / 503

页数：6

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