Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session A38: Quantum Criticality I: Kondo Lattice Systems
8:00 AM–11:00 AM,
Monday, March 15, 2010
Sponsoring Unit: DCMP
Chair: Filip Ronning, Los Alamos National Laboratory
Abstract ID: BAPS.2010.MAR.A38.10
Abstract: A38.00010 : Role of Phonons in Heavy Fermion Volume Collapse within the Periodic Anderson Model*
9:48 AM–10:00 AM
Preview Abstract Abstract
(University of Wuerzburg)
(University of Goettingen)
(Lawrence Livermore National Lab)
Recent X-ray and neutron diffraction studies indicate the involvement of phonons in the volume collapse of Cerium. Whether phonons are driven the volume change, or the effect has an electronic origin and phonons play a secondary role, is unknown. We address this problem within the Periodic Anderson Model using Continuous Time Quantum Monte Carlo as the cluster solver within DMFA and DCA. We consider several possibilities of Holstein phonons coupled with the local 4f electronic density, the d electron density, or the hybridization term. We calculate the temperature and volume dependence of the Debye frequency for these different electron-phonon couplings and evaluate the change in entropy during the transition.
*This work was supported by the NSF through OISE-0952300 and DMR-0548011.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.A38.10
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