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Condensed Matter Seminars

ics Condensed Matter
Thursday, February 2, 2006
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Daniel Phelan [Host: Despina Louca]
"Emergence of Magnetism from a Non-magnetic Mott Insulator"
The parent compound of La1-xSrxCoO3 has a non-magnetic, Mott insulating ground state. As temperature is increased, the parent undergoes a non-magnetic to paramagnetic (PM) transition, and with hole-doping, static ferromagnetic (FM) correlations develop. The mechanisms by which the PM and FM states emerge from the non-magnetic state will be discussed with reference to our neutron scattering measurements. In the PM state, dynamic FM and antiferromagnetic (AFM) correlations likely result from the super-exchange interactions in a dynamically orbitally ordered state. With doping, static isotropic FM droplets are formed due to double exchange, and the FM correlation length increases with hole concentration.

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