Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 44: PhD Symposium Quantum Magnets (contributed talks)

MA 44.9: Vortrag

Mittwoch, 22. März 2017, 17:15–17:30, HSZ 403

Comparison between dynamical permeability and permittivity in Dy2Ti2O7 at low temperatures — •Steffen Harms1, Christoph P. Grams1, Martin Valldor2, Johanna Frielingsdorf1, Thomas Lorenz1, and Joachim Hemberger11Institute of Physics II, University of Cologne, Germany — 2Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

Dy2Ti2O7 is one of the well known spin-ice compounds in which magnetic monopoles are emergent [1]. These monopoles carry electric dipoles [2] and therefore their dynamics is apparent in the dielectrical response ε*(ν). Recently published data reveal the speeding up of a dielectric relaxation process reaching a relaxation rate of up to ν ∼ 100 kHz near the critical endpoint of the (H,T)-phase diagram [3]. This process can be associated with the hopping of magnetic monopoles and should, among other contributions, leave a fingerprint in the magnetic ac-permeability. Here we present a comparative broadband study of complex permittivity and permeability in the mK range in order to disentangle the different contributions to the dynamic response in the spin ice Dy2Ti2O7.

Funded through the Institutional Strategy of the University of Cologne within the German Excellence Initiative and the Deutsche Forschungsgemeinschaft through project HE-3129/2-1 and CRC 1238.

[1] C. Castelnovo et al., Nature 451, 42 (2008).

[2] D. I. Khomskii, Nature Communications 3, 1 (2012).

[3] C. P. Grams et al., Nature Communications 5, 4853 (2014).

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