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Unconventional features of oxide HTSC from positron annihilation measurements
D SANYAL, P M G NAMBISSAN, TH WOLF, U DE
Published in Elsevier Science Publishers B.V., Amsterdam
2000
Pages: 928 - 930
Abstract
Our recent measurements of positron lifetime (related to electron density at the annihilating sites) components or τi and Doppler broadening of positron annihilation radiation lineshape or S-parameter (denoting the fraction of low-momentum electrons among the annihilating electrons) on Bi-2212 and (Bi,Pb)-2223 pellets and Y-123 single crystals firstly confirm step-like changes across Tc. Our second and new observation is that S versus T graph in the superconducting transition region shows a double minimum for 2223 and 123 and a single minimum for 2212. These steps and minima, not seen for superconductors like Nb3Sn, are linked to such features of HTSC electronic structure as are not found in conventional superconductors.
About the journal
JournalData powered by TypesetPhysica B: Condensed Matter
PublisherData powered by TypesetElsevier Science Publishers B.V., Amsterdam
ISSN0921-4526