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Probing superconductors from 30 to 300 K by positron-lifetime measurements
D SANYAL, D BANERJEE, U DE
Published in -
1998
Volume: 58
   
Issue: 22
Pages: 15226 - 15230
Abstract
The present measurement of positron annihilation lifetimes for the high-(Formula presented) superconductor (Formula presented) or (Bi, Pb)-2223, as a function of temperature, has been inspired by our recent DBPARL (Doppler-broadened positron annihilation radiation line shape) finding of a step and minima in the region around (Formula presented) K, in the variation with temperature, of the fraction of low momentum electrons at the annihilation sites. The positron annihilation lifetime in the superconductor probes the number density of electrons at the annihilation sites. The present work observes a reduction of lifetime components in the (Formula presented) region. Significant changes in the lifetime components in other temperature regions have also been observed and discussed. © 1998 The American Physical Society.
About the journal
JournalPhysical Review B - Condensed Matter and Materials Physics
Publisher-
ISSN1098-0121