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Condensed Matter Seminars

ics Condensed Matter
Thursday, October 5, 2006
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Collin Broholm [Host: Seunghun Lee]
Johns Hopkins
"Ferro-electricity in Frustrated Magnets"
While electrostatics and magnetostatics are disparate phenomena in a vacuum, no symmetry forbids materials from responding magnetically to an electric field or vise versa. Materials with a strong magneto-electric response are of interest for applications and challenge our understanding of magnetic dielectrics. I discuss specific examples of magneto-electricity in metal oxides with triangular or kagomé lattices of spins with competing antiferromagnetic interactions [1-3]. It is shown that inversion symmetry breaking magnetic order can act as an effective electric field through magneto-elastic distortions that relieve frustration. The results presented in this talk are based on magnetic neutron scattering experiments.

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