Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Focus: Magnetism as seen by neutrons

MA 14.4: Hauptvortrag

Dienstag, 8. März 2016, 11:15–11:45, H32

Vortex matter: from superconductivity to skyrmions — •Sebastian Mühlbauer — Heinz Maier-Leibnitz Zentrum (MLZ), Garching, Technische Universität München

Both superconducting vortex [1,2] and skyrmion lattices in chiral magnets [3] can be regarded as macroscopic lattices, formed by topological entities. Analogous to condensed matter, a large variety of phases is also observed for vortex and Skyrmion matter, resembling the particle like character and reflecting the underlying physical properties. Moreover, both vortex and Skyrmion matter represent ideal model systems for questions of general importance as topological stability and decay.

As for superconducting vortex matter, Skyrmion melting transitions, Skyrmion liquids and Skyrmion glass phases are expected to exist in various materials. Due to their topology, they provide an excellent showcase for the investigation of topological phase conversion [4].

Neutron scattering provides an ideal tool for the investigation of both vortex and Skyrmion matter. We present an overview how to address the static and dynamic properties of superconducting vortex and Skyrmion matter by means of neutron grating interferometry (nGI), time-resolved small angle neutron scattering (TISANE) and neutron resonance spin echo spectroscopy (NRSE). Our study paves the way how to access vortex and Skyrmion lattice melting as well as their current induced motion and dynamic properties in bulk samples.

[1] S. Mühlbauer et al., Phys. Rev. Lett 102 136408 (2009) [2] S. Mühlbauer et al., Phys. Rev. B 83, 184502 (2011) [3] S. Mühlbauer et al., Science 323 915 (2009) [4] P. Milde et al., Science 340, 6136, (2013)