Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Poster Session: Matter at Low Temperature
TT 11.11: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Broadband magnetodielectric spectroscopy on quantum paraelectric materials in the millikelvin-regime — •Christoph Grams, Max Schalenbach, Daniel Niermann, Harald Kierspel, and Joachim Hemberger — 2. Physikalisches Institut, Universität zu Köln, Deutschland
Quantum paraelectric materials are characterized by an extended dielectric permittivity due to the vicinity to a ferroelectric transition which, however, is suppressed by quantum fluctuations down to lowest temperatures.
Using broadband dielectric spectroscopy from 10−2 Hz to 1 MHz we examine the polarization dynamics in quantum paraelectric materials by measuring the complex permittivity as a function of temperature and magnetic field.
We present our results on (Fe-doped) SrTiO3 and Dy2Ti2O7. For the latter compound special weight has been put on the investigation of the magneto-dielectric response within the spin-ice regime which previously has been discussed in connection with the formation of magnetic monopoles [1].This work was supported by the DFG through SFB 608.
C. Castelnovo, R. Mössner, S. L. Sondhi, Nature, 451, 06433 (2008)