A neutron crystal-field study of the copper isotope effect on the pseudogap in the high-T-c cuprate HoBa2Cu4O8

Authors
Temprano, DR Mesot, J Janssen, S Conder, K Furrer, A Sokolov, A Trounov, V Kazakov, S Karpinski, J Muller, KA
Citation
Dr. Temprano et al., A neutron crystal-field study of the copper isotope effect on the pseudogap in the high-T-c cuprate HoBa2Cu4O8, J ALLOY COM, 323, 2001, pp. 554-557
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN journal
09258388 → ACNP
Volume
323
Year of publication
2001
Pages
554 - 557
Database
ISI
SICI code
0925-8388(20010712)323:<554:ANCSOT>2.0.ZU;2-4
Abstract
The copper isotope effect on the relaxation rate of crystal-field transitio ns in the slightly underdoped high-temperature superconductor HoBa2Cu4O8 ha s been investigated by means of inelastic neutron scattering. The measureme nts give clear evidence for the opening of a normal stare pseudogap ar T* f ar above T-c, but it is shifted from T*=160(10) K for the HoBa2 (Cu4O8)-Cu- 63 compound to T*=185(5) K for the (HoBa2Cu4O8)-Cu-65 compound, giving rise to an isotope effect of DeltaT*=25(15) K. (C) 2001 Elsevier Science B.V. A ll rights reserved.