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TT: Fachverband Tiefe Temperaturen
TT 13: FS: Topological Defects in Electronic Systems
TT 13.2: Hauptvortrag
Dienstag, 23. März 2010, 10:00–10:30, H20
Dirac Strings and Magnetic Monopoles in the Spin Ice, Dy2Ti2O7 — •David Jonathan Pryce Morris1, Alan Tennant1, 2, Santiago Grigera3, Bastian Klemke1, 2, Claudio Castelnovo4, Roderich Moessner5, Clemens Czternasty1, Michael Meissner1, Kirrily Rule1, Jens-Uwe Hoffmann1, Klaus Kiefer1, Damien Slobinsky6, and Robin Perry7 — 1Helmholtz Center Berlin for Materials and Energy, Berlin, Germany — 2Technische Universität Berlin, Germany — 3Instituto de Fisica de Liquidos y Sistemas Biologicos, La Plata, Argentina — 4University of Oxford, United Kingdom — 5Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany — 6St. Andrews University, United Kingdom — 7University of Edinburgh, Scotland
Recent proposals in condensed matter physics that magnetic monopoles can appear as emergent quasiparticles have attracted wide levels of interest. Dirac’s original picture of magnetic monopoles had them connected to strings through which magnetic flux flowed. Here we report studies into a system called Spin Ice, where spins obey "ice rules" of 2 spins into and 2 spins out of their tetrahedron. In these materials it has been predicted that strings of spins form via a 3D Kasteleyn transition [1]. The geometry of spin-ice allows for net magnetic charge (magnetic monopoles) to form where "ice rules" are broken at the tips of the strings [2]. Here we present three experimental pieces of evidence for these strings and magnetic monopoles [3].
[1] Phys Rev. Lett. 100, 067207 (2008)
[2] Nature 451, 42 (2008)
[3] Science 326, 411 (2009)
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