Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.11: Poster

Friday, March 24, 2017, 09:30–13:00, P2-OG4

Electric coupling of magnetic monopoles in the quantum spin-ice Pr₂Hf₂O₇ — •Jacob Hornung^1,2, Lars Opherden^1,2, Thomas Herrmannsdörfer¹, Alexandros Samartzis³, Bella Lake^3,4, and Jochen Wosnitza^1,2 — ¹Hochfeld-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.