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SUMMARY:Magnetothermopower in heavy fermion metamagnets CeRu2Si2 and YbRh2
 Si2 - Ramzy Daou
DTSTART:20120523T101500Z
DTEND:20120523T111500Z
UID:TALK37694@talks.cam.ac.uk
CONTACT:Michael Sutherland
DESCRIPTION:The Mott formula connects the energy derivative of the electri
 cal conductivity with the thermopower. This forms the basis of our interpr
 etation of thermopower measurements in the Fermi liquid state at low\ntemp
 eratures. Thermoelectric transport measurements therefore access not only 
 properties of the Fermi surface but also their energy dependence.\n\nI wil
 l present new measurements of the thermoelectric power at low temperature 
 in magnetic fields up to 12T on the well known heavy fermion materials CeR
 u2Si2 and YbRh2Si2. In both of these materials\, a metamagnetic\ntransitio
 n occurs at around 10T. I will discuss the possible origins of metamagneti
 sm in each case and show why the thermopower is a valuable probe that can 
 be more sensitive to Fermi surface changes than other transport properties
 \, and what conclusions we can draw from successes and failures of the Mot
 t formula.\n\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory\, Department of Physics
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