Vortex glass-liquid transition and activated flux motion in an epitaxial, superconducting NdFeAs(O, F) thin film. (2nd October 2018) - Hänisch, J.
Abstract: Abstract : An epitaxial NdFeAs(O, F) thin film of 90 nm thickness grown by molecular beam epitaxy on MgO single crystal with T c = 44.2 K has been investigated regarding a possible vortex glass–liquid transition. The voltage–current characteristics show excellent scalability according to the vortex-glass model with a static critical exponent ν of around 1.35 and a temperature-dependent dynamic exponent z increasing from 7.8 to 9.0 for the investigated temperature range. The large and non-constant z values are discussed in the frame of 3D vortex glass, thermally activated flux motion, and inhomogeneity broadening.