ELFT HÍRADÓ

[Varga Imre <varga AT neumann.phy.bme.hu>]

                                     MEGHIVO

                  a BME Fizikai Intezet, Elmeleti Fizika Tanszek
                                  szeminariumara:

                                   Kazumi Maki
                       Department of Physics and Astronomy,
                University of Southern  California, Los Angeles, USA

      "Topological Defects in Triplet Superconductors UPt3, Sr2RuO4, etc."

        Helye: BME Fizikai Intezet,
               Elmeleti Fizika Tanszek
               Budafoki ut 8.
               F-epulet, III. lepcsohaz, magasfoldszint
               szeminariumi szoba

        Ideje: 2005. majus 13. pentek, 10:15.

        Abstract: After a brief survey on nodal superconductors, we review
        the topological defects in triplet superconductors such as
        UPt$_3$, Sr$_2$RuO$_4$, etc. This work is in part motivated by the
        surprising discovery of Mota and her colleagues that in some
        triplet superconductors the flux motion is completely impeded (the
        ideal pinning). Among topological defects the most prominent is
        Abrikosov's vortex with quantum flux $\phi_0=hc/2e$. Abrikosov's
        vortex is universal and ubiquitous and seen both in conventional
        and unconventional superconductors by the Bitter decoration
        technique, small angle neutron scattering(SANS), scanning
        tunneling microscopy (STM), micromagnetometer, and most recently
        Lorentz electron micrograph. In order to interpret the experiment
        by Mota et. al. a variety of textures are proposed. In analogy to
        superfluid $^3$He-A, the l-soliton and d-soliton play the
        prominent role. We review these notions and point out possible
        ways of detecting these domain walls and half-quantum vortices in
        some of triplet superconductors.


        Minden erdeklodot szivesen latunk.


                                                        Varga Imre