Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.11: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG4

Electric coupling of magnetic monopoles in the quantum spin-ice Pr2Hf2O7 — •Jacob Hornung1,2, Lars Opherden1,2, Thomas Herrmannsdörfer1, Alexandros Samartzis3, Bella Lake3,4, and Jochen Wosnitza1,21Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Institut für Festkörperphysik, TU Dresden, Germany — 3Abteilung Quantenphänomene in neuen Materialien, HZB, Berlin, Germany — 4Institut für Festkörperphysik, TU Berlin, Germany

We report on the magnetoelectric coupling of magnetic monopole excitations in the quantum spin-ice material Pr2Hf2O7. We have investigated Pr2Hf2O7 single crystals by means of dynamic permittivity and susceptibility measurements down to 100 mK. The ac susceptibility, its frequency, field, and temperature dependence, and its saturation at a finite value in the low-temperature limit indicate the formation of a quantum spin-ice state. The permittivity shows a clear correlation to the monopole density and an anomaly in magnetic fields along the local [111] direction. This hints at a charge redistribution on the magnetic monopole sites, leading to the formation of electric dipole moments.

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