Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Correlated Electrons: Spin Systems and Itinerant Magnets - Frustrated Magnets I
TT 8.2: Vortrag
Montag, 31. März 2014, 09:45–10:00, HSZ 304
Vibrating coil magnetometry in Dy2Ti2O7 at milli-Kelvin temperatures — •Christopher Duvinage1, Dharmalingam Prabhakaran2, Christian Pfleiderer1, and Andrew T. Boothroyd2 — 1Physik-Department, Technische Universität München, D-85748 Garching, Germany — 2Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, United Kingdom
Spin ice attracts great interest as a state in which emergent fractionalized excitations and magnetic-field induced topological forms of order may occur. An important characteristic of the spin ice systems Dy2Ti2O7 and Ho2Ti2O7, as well as the spin liquid system Tb2Ti2O7, is the observation of spin freezing below a few hundred mK [1,2]. We report vibrating coil magnetometry down to mK temperatures of Dy2Ti2O7, addressing the evidence for field-induced phase transitions. Of particular interest is the observation of putative magnetisation avalanches in the spin-frozen state which depend sensitively in number and size on the sweep rate of the applied magnetic field. These avalanches have been interpreted in terms of monopole excitations [3].
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