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.
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收藏
页码：498 / 503
页数：6
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