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SUMMARY:Electronic Structure of LuRh2Si2: ”Small“ Fermi Surface Refere
 nce of YbRh2Si2 - Sven Friedemann\, University of Cambridge
DTSTART:20130213T111500Z
DTEND:20130213T121500Z
UID:TALK43289@talks.cam.ac.uk
CONTACT:Helen Verrechia
DESCRIPTION:We present band structure calculations and quantum oscillation
  measurements on LuRh2Si2which\nis an ideal reference to the intensively s
 tudied quantum critical heavy-fermion system YbRh2Si2.\nWe find a sensitiv
 e dependence of the Fermi surface topology with respect to the position of
  the\nSi atoms zSi. Best match between calculated and measured quantum osc
 illation frequencies and masses is found using the experimental value zSi 
 = 0.379c in good agreement with the value obtained from lattice relaxation
 . We suggest usage of precisely determined crystal lattice parameters for 
 future band structure calculations on LuRh2Si2 and YbRh2Si2.\nWe find indi
 cations for previously unnoticed harmonics in the quantum oscillation meas
 urements\non YbRh2Si2. The remaining fundamental frequencies below 4kT sho
 w large differences with the results on LuRh2Si2and refined band structure
  calculations of the “small” Fermi surface configuration of YbRh2Si2. 
 This discrepancy underpins the interpretation of quantum oscillation measu
 rements on YbRh2Si2 in terms of the ”large“ Fermi surface with the f e
 lectrons itinerant even across the suggested Lifshitz transition at 10T. Y
 et the limited agreement with refined fully itinerant local density approx
 imation calculations highlights the need for more elaborated models to des
 cribe the Fermi surface of YbRh2Si2.\n
LOCATION:Small Lecture Theatre\, Cavendish Laboratory\, Department of Phys
 ics
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