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Lecture Giniyat Khaliullin


01 May 2006 FWN-Building 5113.0202, Nijenborgh 4, 9747 AG, Groningen
Speaker:Dr. Giniyat Khaliullin
Affiliation:Max-Planck-Institut FKF Stuttgart, Germany
Title:Unusual magnetic correlations in layered cobaltates
Date:Mon May 1, 2006
Location:FWN-Building 5113.0202
Host:M. Mostovoy
Telephone:+31 50 363 3419


We consider the exchange interactions between t2g spins of cobalt ions in a two-dimensional triangular lattice. The low-energy effective Hamiltonian supports a variety of magnetic states depending on the competition between a relativistic spin-orbit coupling and lattice distortion. In one particular limit (weak lattice distortions), the Hamiltonian resembles a "compass" model and leads to a highly noncomplanar and noncollinear magnetic correlations with a condensation of the spin vorticity in the ground state. We will also address the magnetism of sodium-rich compounds Na1-xCoO2 and discuss it in terms of spin/orbital polaronic liquid.
Last modified:22 October 2012 2.30 p.m.