Influence of intrinsic superconducting parameters on the vortex dynamics and critical currents of different superconductor materials

N. HABERKORN; J. KIM; I. USOV; B. MAIOROV; M. WEIGAND; L. CIVALE

Boston

Congreso; APS March Meeting 2012; 2012

American Physical Society

Vortex physics became a major field in condensed matter and statistical physics since the discovery of the oxide high temperature superconductors (HTS). Although the rich HTS vortex phenomenology arises from the large influence of thermal fluctuations, there is no hard boundary between HTS and conventional low temperature superconductors. The discovery of the iron-based superconductors provided a chance to study vortex matter in a new family of materials with broad ranges of superconductor transition temperature and crystalline anisotropy, where the small coherence length in some of them results in large fluctuation effects similar to those found in the oxide HTS. In this presentation, we will discuss the vortex dynamics of iron arsenide and oxide HTS by performing magnetization measurements of the critical current density Jc and flux creep rate ($S)$. We will analyze the different creep regimes and crossovers that appear in the different samples and their relations to intrinsic superconducting parameters.