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Journal Article

Anomalous magnetic field dependence of the thermodynamic transition line in the isotropic superconductor (K,Ba)BiO3

MPS-Authors
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Samuely,  P.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jansen,  A. G. M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Blanchard, S., Klein, T., Marcus, J., Joumard, I., Sulpice, A., Szabó, P., et al. (2002). Anomalous magnetic field dependence of the thermodynamic transition line in the isotropic superconductor (K,Ba)BiO3. Physical Review Letters, 88(17): 177201.


Cite as: https://hdl.handle.net/21.11116/0000-000E-EDBB-5
Abstract
Thermodynamic (specific heat, reversible magnetization,
tunneling spectroscopy) and transport measurements have been
performed on high quality (K, Ba)BiO3 single crystals. The
temperature dependence of the magnetic field H-Cp corresponding
to the onset of the specific heat anomaly presents a clear
positive curvature. H-Cp is significantly smaller than the
field H-Delta for which the superconducting gap vanishes but is
closely related to the irreversibility line deduced from
transport data. Moreover, the temperature dependence of the
reversible magnetization presents a strong deviation from the
Ginzburg-Landau theory emphasizing the peculiar nature of the
superconducting transition in this material.