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Quasi one-dimensional vanadium oxides with strong spin-orbit interaction
(University of Wisconsin-Madison,USA (Dept.Physics))
Aula A1 (LNF)
Via Enrico Fermi, 40
00044 Frascati (Roma)
Geometrically frustrated magnets with orbital degeneracy exhibit a variety of complex ground states with unusual magnetic and orbital orders. In my talk, I will focus on vanadium oxides with general formula AV2O4 in which orbital fluctuations strongly influence magnetic properties and give rise to novel properties not observed in purely spin materials. I will discuss two vanadium compounds: a spinel ZnV2O4 and a quasi-one-dimensional compound CaV2O4. The vanadium chains in these compounds are characterized by frustrated magnetic interactions, Ising-like orbital exchanges and a relativistic spin-orbit interactions. On these two examples I will show how the interplay between spin, orbital and lattice degrees of freedom leads to a variety of interesting ground states and elementary excitations.