Vortex lattice reorientation and anisotropy in MgB2 - effects of two-band superconductivityстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We present small-angle neutron scattering (SANS) measurements of the vortex lattice (VL) in single crystal MgB2-a two-band superconductor. Bragg diffraction of neutrons visualizes the structure and orientation of the VL while the scattered intensity probes the super-carrier density. Superconductivity in the pi-band is rapidly suppressed with increasing field with a corresponding decrease in scattered intensity and a re-orientation of the VL between 0.5 and 0.9 T. Both these observations are consistent with superconductivity in the pi-band being weaker than in the sigma-band (Delta(pi) < Delta(sigma)), and a changing influence of different parts of the Fermi surface determining the VL orientation. SANS measurements of the VL for fields applied at an angle to the c-axis allow the penetration depth anisotropy, gamma(lambda), to be estimated. (C) 2004 Elsevier B.V. All rights reserved.