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We report high-resolution specific heat data on a high-quality single crystalof the classical superconductor V3Si, which reveal tiny lambda-shape anomaliesappearing superimposed onto the BCS specific heat jump at the superconductingtransition in magnetic fields of 2 T and higher. The appearance of theseanomalies is accompanied by a magnetic-field-induced broadening of thesuperconducting transition. We demonstrate, using scaling relations predictedby the fluctuation models of the 3d-XY and the 3d-Lowest-Landau-Level (3d-LLL)universality class, that the effect of critical fluctuations becomesexperimentally observable due to of a magnetic field-induced enlargement of theregime of critical fluctuations. The scaling indicates that a reduction of theeffective dimensionality due to the confinement of quasiparticles into lowLandau levels is responsible for this effect.

journal of physics. condensed matter

Magnetic field induced enlargement of the regime of critical  fluctuations in the classical superconductor V3Si from high-resolution  specific heat experiments