Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Frustrated Magnets - Spin Liquids (joint session TT/MA)

MA 6.6: Vortrag

Montag, 1. April 2019, 16:15–16:30, Theater

Investigation of the Thermodynamic Properties of Insulating Pr-based Pyrochlores — •J. Gronemann1,2, T. Gottschall1, E.L. Green1, H.D. Zhou3, A. Islam4, B. Lake4,5, and J. Wosnitza1,21Hochfeld-Magnetlabor Dresden (HLD-EMFL), HZDR, Dresden, Germany — 2Institut für Festkörper- und Materialphysik, TU Dresden, Germany — 3Univ. of Tennessee, Knoxville, USA — 4Helmholtz-Zentrum Berlin, Germany — 5Institut für Festkörperphysik, TU Berlin, Germany

Geometrically frustrated pyrochlores exhibit novel properties at low temperatures and are well-known spin-liquid candidates. In the insulating compounds Pr2Sn2O7 and Pr2Hf2O7 the orientation of the spins of the Pr3+ ions on corner-sharing tetrahedrons show dynamics beyond the spin-ice state [1]. Due to the small magnetic moment of the Pr3+ ion, generating only a small dipolar interaction, transverse fluctuations may have a significant influence. The spin dynamics in these materials remains unfrozen to lowest temperatures and the possibility of quantum fluctuations makes them quantum spin-liquid candidates [2], which are expected to host a variety of emergent electrodynamic phenomena in analogy to magnetic monopoles in spin-ice. To probe the nature of the low-temperature ground state and the changes in the entropy, specific heat was measured down to 450 mK and up to 13 T.
H. D. Zhou. et al., Phys. Rev. Lett. 101, 227204 (2008)
R. Sibille et al., Phys. Rev. B 94, 024436 (2016)

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