SOFTENING OF VIBRATIONAL MODES OF THE HIGH-Tc PHASE OF Bi-SYSTEM SUPERCONDUCTOR

SOFTENING OF VIBRATIONAL MODES OF THE HIGH-T_c PHASE OF Bi-SYSTEM SUPERCONDUCTOR

Li Yang，

Cao Guohui，

Ma Ruzhang，

Cheng Benpei，

Kong Jie

Nuclear Science and Techniques

Vol.3, No.2

pp.78-82

Published in print 01 May 1992

24800

The temperature dependent ⁵⁷Fe Mössbauer and X-ray diffraction measurement on Bi-system 2:2:2:3 phase have been carried out from 77 K to 300 K. It was found that there are two anomalous behaviors of lattice vibrational modes near 125 K and 220 K. This phenomena of lattice softening above Tc is taken as a precursor effect of superconductivity.

Mössbauer effectHigh-Tc superconductorLattice softeningX-ray diffraction

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