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Thermodynamic (specific heat, reversible magnetization, tunnelingspectroscopy) and transport measurements have been performed on high quality(K,Ba)BiO$_3$ single crystals. The temperature dependence of the magnetic field$H_{Cp}$ corresponding to the onset of the specific heat anomaly presents aclear positive curvature. $H_{Cp}$ is significantly smaller than the field$H_\Delta$ for which the superconducting gap vanishes but is closely related tothe irreversibility line deduced from transport data. Moreover, the temperaturedependence of the reversible magnetization present a strong deviation from theGinzburg--Landau theory emphasazing the peculiar nature of the superconductingtransition in this material.Comment: 4 pages, 4 figures, 28 reference

physical review letters

Anomalous Magnetic Field Dependence of the Thermodynamic Transition Line in the Isotropic Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi>K</mml:mi><mml:mo>,</mml:mo><mml:mi>B</mml:mi><mml:mi>a</mml:mi><mml:mo>)</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mi>BiO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Anomalous Magnetic Field Dependence of the Thermodynamic Transition Line in the Isotropic Superconductor(K,Ba)BiO3