New Fe based superconductors: vortex state in FeSe_{1-x}Te_{x}.

M. L. AMIGÓ; D. G. FRANCO ; J. GUIMPEL; V. F. CORREA; G. NIEVA

Lorena

Otro; Escola Avançada de Condutores e Supercondutores Anisotrópicos; 2011

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

We have studied transport properties in the mixed and normal state of the new iron based superconductors. We have measured the resistivity as a function of temperature in magnetic fields up to 16T for FeSe and FeSe_{0,6}Te_{0,4} single crystals. We have also measured angular dependencies of the resistivity for several fields and temperatures in the mixed state. We have determine the activation energy for the movement of vortices in the dissipative state below Tc in order to reveal the presence of correlated defects.