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Unusual Mott transition in multiferroic PbCrO3.

Shanmin Wang1, Jinlong Zhu2, Yi Zhang3

  • 1Institute of Atomic & Molecular Physics, Sichuan University, Chengdu 610065, China; High Pressure Science & Engineering Center and Physics Department, University of Nevada, Las Vegas, NV 89154; Los Alamos Neutron Science Center and Materials Science & Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545; shanminwang@gmail.com duanweihe@scu.edu.cn Yusheng.Zhao@unlv.edu.

Proceedings of the National Academy of Sciences of the United States of America
|November 26, 2015
PubMed
Summary

Researchers achieved a pressure-induced Mott transition in PbCrO3, validating Mott

Keywords:
Mott criticalityMott transitionPbCrO3isostructural transitionmultiferroics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Mott insulators arise from Coulomb repulsion, localizing electrons.
  • Mott transitions are typically induced by bandwidth or band filling changes.
  • These methods deviate from Mott's original theory involving Coulomb potential screening and lattice contraction.

Purpose of the Study:

  • To investigate a pressure-induced Mott transition in cubic perovskite PbCrO3.
  • To validate Mott's original scenario for insulator-metal transitions.
  • To explore the relationship between lattice, charge, and ferroelectric distortion in this transition.

Main Methods:

  • Applying hydrostatic pressure to cubic perovskite PbCrO3.
  • Observing changes in lattice volume and Coulomb potential.
  • Characterizing the material's transformation from insulator to metal.

Main Results:

  • A pressure-induced isostructural Mott transition occurred at ~3 GPa.
  • Significant collapse in lattice volume and Coulomb potential observed.
  • PbCrO3 transitioned from a hybrid multiferroic insulator to a metal.
  • Fluctuations near criticality exhibited elastic anomalies and Landau critical behaviors.
  • Ferroelectric distortion was suppressed at high pressures, enabling a first-order transition.

Conclusions:

  • The study validates Mott's original theory of insulator-metal transitions.
  • Pressure-induced screening of Coulomb potential and lattice contraction drive the Mott transition in PbCrO3.
  • Ferroelectric distortion plays a key role in the insulating phase and its suppression drives the transition.