Premium
Anomalous Up‐and‐Down Variation of Positron Lifetime Near T c in High‐temperature Superconductors
Author(s) -
Zhang D. M.,
Tang C. Q.,
Gen T.,
Li G. Y.
Publication year - 1993
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170280216
Subject(s) - superconductivity , positron , condensed matter physics , superconducting transition temperature , transition temperature , crystallite , materials science , high temperature superconductivity , chemistry , physics , nuclear physics , crystallography , electron
The temperature dependence of the positron lifetimes in the polycrystalline high T c superconducting YBaCuO and BiSrCaCuO and the non‐superconducting YBaCuO have been investigated by using the position lifetime technique. It is found from the experiments that there is an evident temperature dependence for the two kinds of superconducting samples but no temperature dependence for non‐superconducting sample. It is important that the anomalous up‐and‐down variation of positron lifetime near T c has been observed in the measured superconducting samples. We suggest that this strange temperature dependence of the positron lifetimes near T C may result from some changes induced by the phase transition.