Regensburg 2013 – wissenschaftliches Programm
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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 Skrotzki1,2, 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)