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TT: Fachverband Tiefe Temperaturen

TT 40: Poster Session Correlated Electrons

TT 40.66: Poster

Mittwoch, 13. März 2013, 15:00–19:00, Poster D

Investigations of the Magnetic Properties in the Pyrochlore Ho₂Ti₂O₇ — •Rico Schönemann¹, Thomas Herrmannsdörfer¹, Elizabeth Lauren Green¹, Richard Skrotzki^1,2, Zhaosheng Wang¹, Hiroshi Kaneko³, Haruhiko Suzuki³, and Joachim Wosnitza¹ — ¹Dresden High Magnetic Field Laboratory, Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²Department of Chemistry and Food Chemistry, TU Dresden, Dresden, Germany — ³Faculty of Mathematics and Physics, Kanazawa University, Kanazawa, Japan

Pyrochlore compounds such as R₂Ti₂O₇ (where R is Ho or Dy) have an highly degenerate ground state where the R³⁺ moments obey the "ice rules". This provides access to study extraordinary physical phenomena, like the formation of magnetic monopoles. Recent publications evidence monopoles which can be probed using high frequency (adiabatic) susceptibility measurements [1]. We performed ac susceptibility measurements on a single-crystal Ho₂Ti₂O₇ sample at low temperatures down to 30 mK and magnetic fields up to 14 T. Based on isothermal frequency sweeps we were able to determine spin relaxation rates. Both the real and imaginary parts of the temperature-dependent magnetic susceptibility measurements show the spins freezing below 1 K and provide insight into the magnetic-monopole density.

This research has been funded in part by EuroMagNET II (EU contract No. 228043).
[1] L. Bovo et al., arXiv:1210.0106v1 (2012)