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Condensed Matter Seminars

ics Condensed Matter
Thursday, November 8, 2007
4:00 PM
Physics Building, Room 204
Note special time.
Note special room.
Yeong-Ah Soh [Host: Seunghun Lee]
Dartmouth College
"Mesoscopic physics in a quantum magnet chromium"
ABSTRACT:
Cr is a simple metal and quintessential spin density wave antiferromagnet that has a quantum critical point. The Hall number collapses on entering the antiferromagnetic state because the Fermi surface is reduced as some of the carriers are localized to produce the magnetic order. Our studies of the Hall effect in Cr[1] were the first to measure the Hall effect in any metal near an antiferromagnetic quantum critical point and showed that it can be a very sensitive probe to study quantum phase transitions. We recently extended our studies to films to explore a two-dimensional system. By growing extremely high quality Cr films we observe quantization of spin density waves and scattering from antiferromagnetic domain walls, effects which can be easily tuned by the film thickness.

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