Berlin 2012 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 47: Correlated Electrons: Spin Systems and Itinerant Magnets 2
TT 47.4: Talk
Friday, March 30, 2012, 10:15–10:30, H 0104
Search for quantum spin ice in Tb2Ti2O7 at milli-Kelvin temperatures — S. Legl1, •C. Krey1, S.R. Dunsiger1, C. Pfleiderer1, H.A. Dabkowska2, J. Rodriguez2, and G.M. Luke2 — 1Physik Department E21, Technische Universität München, Germany — 2Department of Physics and Astronomy, McMaster University, Hamilton, Canada
Spin ice attracts great interest as a state in which emergent fractionalized excitations and magnetic-field induced topological forms of order may occur. However, little is known about the importance of quantum fluctuations for the spin ice state. We report a search for
so-called quantum spin ice, i.e., a spin ice state driven by quantum fluctuations [1]. Using a vibrating coil magnetometer as combined with a dilution refrigerator [2], we performed comprehensive magnetization measurements in high-quality single crystals of Tb2Ti2O7. As an
isostructural sibling of the conventional spin ice systems
Ho2Ti2O7 and Dy2Ti2O7 strong quantum fluctuations are believed to suppress long-range magnetic order in Tb2Ti2O7 despite strong antiferromagnetic interactions. We find that Tb2Ti2O7 clearly remains paramagnetic down to the lowest temperatures studied without the magnetic field dependence predicted
theoretically for quantum spin ice.
Molavian et al., Journal of Physics: Condensed Matter, 21(17):172201 (2009).
Legl et al., Rev. Sci. Instrum. 81, 043911 (2010).