Physics – Condensed Matter – Superconductivity
Scientific paper
2003-07-04
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures, submitted to PRL
Scientific paper
10.1103/PhysRevLett.91.207001
The effect of strong magnetic fields (11 T) on superconductivity in YBa2Cu3O7-d is investigated using high-resolution thermal expansion. We show that the field-induced broadening of the superconducting transition is due to a finite-size effect resulting from the field-induced vortex-vortex length scale. The physics of this broadening has recently been elucidated for the closely related case of rotating superfluid 4 He [R. Haussmann, Phys. Rev. B60, 12373 (1999)]. Our results imply that the primary effect of magnetic fields of the order of 10 T is to destroy the phase coherence; the pairing, on the other hand, appears to be quite insensitive to these fields.
Lortz Rolf
Meingast Christoph
Rykov Alexandre I.
Tajima Setsuko
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