Isotope dependence of the spin gap in YBa2Cu4O8 as determined by Cu NQR relaxation

Authors
Raffa, F Ohno, T Mali, M Roos, J Brinkmann, D Conder, K Eremin, M
Citation
F. Raffa et al., Isotope dependence of the spin gap in YBa2Cu4O8 as determined by Cu NQR relaxation, PHYS REV L, 81(26), 1998, pp. 5912-5915
Citations number
28
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
00319007 → ACNP
Volume
81
Issue
26
Year of publication
1998
Pages
5912 - 5915
Database
ISI
SICI code
0031-9007(199812)81:26<5912:IDOTSG>2.0.ZU;2-7
Abstract
We performed high accuracy Cu-63 NQR spin-lattice relaxation and SQUID magn etization measurements on O-16 and O-18 exchanged YBa2Cu4O8 to determine th e isotope shift of the temperature of the opening of the spin gap, T*, and the superconducting transition temperature, T-c. The corresponding isotope exponents are alpha(T)* = 0.061(8) and alpha(Tc) = 0.056(12) which are the same within the error bars and suggest a common origin for the superconduct ing and the spin gap.