Direct transition from Bose glass to normal state in the (K,Ba)BiO3 superconductor.
Phys Rev Lett
; 92(3): 037005, 2004 Jan 23.
Article
em En
| MEDLINE
| ID: mdl-14753899
ABSTRACT
The introduction of columnar defects in (K,Ba )Bi O3 single crystals shifts both the irreversibility and thermodynamic transition lines, respectively, deduced from ac susceptibility (and/or transport) and specific heat measurements, upwards. This shift can be attributed to the defect-induced decrease of the difference (Delta F) between the free energies in the superconducting and the normal states, assuming that the position of the superconducting transition is given by the condition absolute value Delta F approximately k(B )T/xi(3 ). This criterion also perfectly reproduces the influence of the angle between the tracks and the external field. This result suggests that no vortex liquid phase exists in this system.
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Phys Rev Lett
Ano de publicação:
2004
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Article
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