Regensburg 2019 – wissenschaftliches Programm
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. Wosnitza1,2 — 1Hochfeld-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 . 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 , 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.
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