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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2005

Thermodynamics of the vortex liquid in heavy-ion-irradiated superconductors

Résumé

It is shown that the large effect of heavy ion irradiation on the thermodynamical properties of the anisotropic superconductor YBa2Cu3O7- extends well into the superconducting fluctuation regime. The presence of the induced amorphous columnar defects shifts the specific-heat maximum at the normal-to-superconducting transition. This effect is similar to that recently put into evidence in cubic KxBa1-xBiO3 x~0.35. In both compounds, vortex pinning manifests itself as a sharp angular dependence of the equilibrium torque. In YBa2Cu3O7-, pinning by the defects appears at the temperature TCp max of the specific-heat maximum, well above the magnetic irreversibility line TirrH. In isotropic KxBa1-xBiO3, the onset of the pinning-related torque anomaly tracks the onset of the specific-heat anomaly and the irreversibility line. In YBa2Cu3O7-, fluctuations of the amplitude of the order parameter and not vortex line wandering are ultimately responsible for the vanishing of pinning. In KxBa1-xBiO3, vortex pinning disappears only at the superconducting-to-normal transition. The results indicate that in both compounds, the pinning energy at the “Bose-glass” transition is large with respect to the total free energy gain in the superconducting state. By implication, the mechanism of this latter transition should be reconsidered.

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Dates et versions

halshs-00007721 , version 1 (09-01-2006)

Identifiants

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Cornelis van Der Beek, Marcin Konczykowski, Luc Fruchter, René Brusetti, Thierry Klein, et al.. Thermodynamics of the vortex liquid in heavy-ion-irradiated superconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 72 (214504), pp.1-9. ⟨halshs-00007721⟩
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