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Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 19: Magnetic Materials III

MA 19.7: Vortrag

Dienstag, 8. März 2016, 13:00–13:15, H31

Study of the geometrically frustrated compound Nd2Sn2O7 — •Bertin A.1, Dalmas de Réotier P.2,3, Fåk B.4, Marin C.2,3, Yaouanc A.2,3, Forget A.5, Sheptyakov D.6, Frick B.4, Ritter C.4, Amato A.7, Baines C.7, and King P.J.C.81TU Dresden — 2Univ. Grenoble Alpes — 3CEA-Grenoble, INAC-SPSMS — 4Institut Laue-Langevin — 5CEA-Saclay, Iramis, SPEC — 6Paul Scherrer Institute, SINQ — 7Paul Scherrer Institute, SµS — 8ISIS Facility, Rutherford Appleton Laboratory

We have undertaken the study of the antiferromagnet pyrochlore compound Nd2Sn2O7 where frustration lattice consists of magnetic ions sitting on a corner-shared tetrahedra network. This compound undergoes a second-order phase transition at Tc=0.91 K into a non collinear "all-in-all-out" magnetic structure, confirmed by the presence of spontaneous oscillations resolved with zero-field µSR measurements. Persistent spin dynamics has been revealed through the temperature independent behaviour of the spin-lattice relaxation rate at low temperatures, and ascribed to 1-dimensional spin-loop excitations. This feature, together with the spin-wave-like excitations seen by specific heat measurements at low temperatures, are barely compatible with a purely Ising spin system and point to the existence of transverse exchange terms. Hence, the anisotropic Hamiltonian for dipolar-octupolar doublet will be discussed. Anomalously long paramagnetic fluctuations have also been revealed by µSR and neutron backscattering experiments up to ≈ 30 Tc. The funding of the current position of the presenting author by BMBF project 05K13ODA is acknowledged.

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