| Issue |
Europhys. Lett.
Volume 44, Number 4, November II 1998
|
|
|---|---|---|
| Page(s) | 498 - 503 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00501-8 | |
| Published online | 01 September 2002 | |
Pseudogap and order-parameter symmetry in the underdoped high-Tc compounds 
and 
: A neutron crystal-field study
1
Laboratory for Neutron Scattering, ETH Zürich & Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
2
Institute Laue-Langevin - P.B. 156 X, F-38042 Grenoble, France
Received:
20
April
1998
Accepted:
22
September
1998
The temperature dependence of the relaxation rate of crystal-field
excitations in the slightly underdoped and 
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 
far above Tc. 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+id3, with 
.
PACS: 74.25.-q – General properties; correlations between physical properties in normal and superconducting states / 74.72.Bk – Y-based cuprates / 76.20.+q – General theory of resonances and relaxations
© EDP Sciences, 1998
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