Effect of disorder in the entropy-jump at the first-order vortex phase transition in Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$

M. I. DOLZ; P. PEDRAZZINI; Y. FASANO; H. PASTORIZA; M. KNOCZKYKOWSKI

Bariloche

Conferencia; Poster presentation en la conferencia Advanced Topics in Magnetism and Superconductivity (ATOMS 2014); 2014

Depto Materia Condensada, Gerencia Física, CAB

In this work we study the effect of disorder introduced by heavy-ion irradiation in the thermodynamic magnitudes entailed in the first-order vortex phase transition in the layered Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8}$ compound. We track the evolution of the enthalpy and the entropy-jump per pancake vortex for this vortex solidification transition by means of AC local magnetic measurements. We study how the density of columnar-track pins affects the temperature-evolution of these thermodynamic properties. From this evidence we find that the electromagnetic coupling between pancake vortices lying in adjancent CuO layers plays a dominant role independently of the density of disorder.