Specific Heat of Type-II Superconductors in Magnetic Fields Near T c

摘要: The GLAG theory predicts that the value of specific heatC M in mixed state just below transition to normal state, is a function Ginzburg—Landau (GL) parameter κ, even for vanishingly small magnetic fields(T≈T c ).C thus different from S pure superconducting state(H=0) all κ except κ≅1.9. Experimental results authors generally confirm this paradoxical prediction which not contradiction with thermodynamics phase transitions. To experimentally clarify behavior close toT , Nb80Mo20(κ≅4) and Pb98In2(κ≅0.8) specimens are studied fields much smaller than those usually applied (down to17 Oe). A new method measuring heat decreasing as well increasing temperature introduced. Very good agreement found higher ∼120 Oe while deviation observed lower where values Abrikosov lattice would become larger 1 µ. sense magnitude such thatC andC be equal 20 below. Possible explanations discussed. It suggested fundamental modification vortex structure occurs .