Mott Metal-Insulator Transition on Compressible Lattices

Mario Zacharias, Lorenz Bartosch, and Markus Garst
Phys. Rev. Lett. 109, 176401 – Published 23 October 2012

Abstract

The critical properties of the finite temperature Mott end point are drastically altered by a coupling to crystal elasticity, i.e., whenever it is amenable to pressure tuning. Similar as for critical piezoelectric ferroelectrics, the Ising criticality of the electronic system is preempted by an isostructural instability, and long-range shear forces suppress microscopic fluctuations. As a result, the end point is governed by Landau criticality. Its hallmark is, thus, a breakdown of Hooke’s law of elasticity with a nonlinear strain-stress relation characterized by a mean-field exponent. Based on a quantitative estimate, we predict critical elasticity to dominate the temperature range ΔT*/Tc8%, close to the Mott end point of κ(BEDTTTF)2X.

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  • Received 6 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.176401

© 2012 American Physical Society

Authors & Affiliations

Mario Zacharias1, Lorenz Bartosch2, and Markus Garst1

  • 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
  • 2Institut für Theoretische Physik, Goethe-Universität, 60438 Frankfurt am Main, Germany

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Issue

Vol. 109, Iss. 17 — 26 October 2012

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