Regensburg 2013 – wissenschaftliches Programm

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PV: Plenarvorträge

PV XI

PV XI: Plenarvortrag

Mittwoch, 13. März 2013, 14:00–14:45, H1

Magnetic Monopoles in Spin Ice — •Roderich Moessner — Max-Planck-Institut fuer Physik komplexer Systeme, Dresden

Fractionalisation is a counterintuitive phenomenon, in which an elementary particle appears to break into two independent entities. A celebrated example of this is spin-charge separation, in which an electron's magnetic (spin) and electric (charge) properties appear to become independent degrees of freedom.

Spin ice materials provide a rare instance of fractionalisation in three dimensions. Their elementary excitations result from the fractionalisation of their microscopic magnetic moments; these excitations can be thought of as magnetic monopoles.

This talk presents an elementary introduction to theoretical concepts for, and experimental studies of, spin ice. It focuses on the unique signatures of the peculiar nature of its excitations. These include unusual neutron scattering structure factors, dynamical arrest and long lived non-equilibrium metastable states, as well as a response to external magnetic fields that promotes spin ice as a new type of magnetic system which has been called a magnetic plasma, a magnetic Coulomb liquid, or a magnetolyte. This talk reviews several of these striking phenomena, and discusses open questions and future perspectives.