Lattice softening effects at the Mott critical point of Crdoped V_{2}O_{3}
Abstract
We have performed sound velocity measurements in (V_{1x}Cr_{x})_{2}O_{3} in the vicinity of the critical point of the firstorder Mott transition line. The pressure sweeps at constant temperature reveal a large dip in the c_{33} compression modulus; this dip sharpens as the critical point is approached. We do not observe signs of criticality on the shear modulus c_{44}, which is consistent with a transition governed by a scalar order parameter, in accordance with the dynamic mean field theory (DMFT) description of the transition. However, the amplitude of the effect is an order of magnitude smaller than the one obtained from DMFT calculations for a singleband Hubbard model. We analyze our results using a simple model with the electronic response function obtained from the scaling relations for the conductivity.
 Publication:

Physical Review B
 Pub Date:
 August 2011
 DOI:
 10.1103/PhysRevB.84.075158
 arXiv:
 arXiv:1012.0515
 Bibcode:
 2011PhRvB..84g5158P
 Keywords:

 71.30.+h;
 71.27.+a;
 Metalinsulator transitions and other electronic transitions;
 Strongly correlated electron systems;
 heavy fermions;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 doi:10.1103/PhysRevB.84.075158