Geometrically frustrated magnets: From Kagome staircase to triangular and honeycomb lattice compounds

Date

Feb 15, 2012

Time

5:00 PM - 6:00 PM

Speaker

Oleg Petrenko

Affiliation

University of Warwick

Language

en

Main Topic

Physik

Other Topics

Physik

Host

IMPRS Seminar

Description

Magnetic systems often exhibit competing magnetic interactions, that is, interactions that do not all favour the same ordered state. Sufficiently strong competition leads to new physics that is manifested by the appearance of noncollinear or incommensurate ordering, novel critical exponents and rich phase diagrams. In such highly frustrated magnetic systems the ground state may remain disordered even at zero temperature. The last two decades have seen a sustained interest in the physics of frustrated magnets both from theoreticians and experimentalists alike. In this talk I review recent experimental studies of several geometrically frustrated materials performed by the Superconductivity & Magnetism Group at University of Warwick, UK. In particular, I describe low-temperature/high-field measurements of magnetisation, specific heat and neutron scattering intensity in the Kagome staircase compound Co3V2O8, triangular lattice Ising-chain Ca3Co2O6, and a family of frustrated magnetic compounds, SrRE2O4, where the magnetic rare-earth ions are linked through a network of triangles and hexagons reminiscent of a honeycomb lattice.

Last modified: Feb 15, 2012, 8:36:16 AM