caa a22 4500 445380799 CHVBK 20180317143016.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-1046-8 doi (NATIONALLICENCE)springer-10.1007/s10948-010-1046-8 Attractive Vortex Interaction and the Intermediate-Mixed State ofSuperconductors [Elektronische Daten] [Ernst Brandt, Mukunda Das] The magnetic vortices in superconductors usually repel each other. Several cases are discussed when the vortex interaction has an attractive tail, and thus a minimum, leading to vortex clusters and chains. Decoration pictures then typically look like in the intermediate state of type-I superconductors, showing lamellae or islands of Meissner state or surrounded by Meissner state, but with the normal regions filled with Abrikosov vortices that are typical for type-II superconductors in the mixed state. Such intermediate-mixed state was observed and investigated in detail in pure Nb, TaN and other materials 40 years ago; last year it was possibly also observed in MgB2, where it was called "a totally new state” and ascribed to the existence of two superconducting electron bands, one of type-I and one of type-II. The complicated electronic structure of MgB2 and its consequences for superconductivity and vortices are discussed. It is shown that for the real superconductor MgB2 which possesses a single transition temperature, the assumption of two independent order parameters with separate penetration depths and separate coherence lengths is unphysical. Springer Science+Business Media, LLC, 2010 Superconductors nationallicence Vortex interaction nationallicence Attraction nationallicence Intermediate-mixed state nationallicence Niobium nationallicence MgB2 nationallicence Brandt Ernst Max-Planck-Institut für Metallforschung, 70506, Stuttgart, Germany aut Das Mukunda Department of Theoretical Physics, The Australian National University, 0200, Canberra, ACT, Australia aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 57-67 1557-1939 24:1-2<57 2011 24 10948 https://doi.org/10.1007/s10948-010-1046-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-1046-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Brandt Ernst Max-Planck-Institut für Metallforschung, 70506, Stuttgart, Germany aut NATIONALLICENCE 700 1- Das Mukunda Department of Theoretical Physics, The Australian National University, 0200, Canberra, ACT, Australia aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 57-67 1557-1939 24:1-2<57 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer