Structural study of the pressure-induced metal-insulator transition in LiV2O4

Alexander J. Browne, Edward J. Pace, Gaston Garbarino, and J. Paul Attfield
Phys. Rev. Materials 4, 015002 – Published 21 January 2020

Abstract

At ambient pressure the spinel LiV2O4 is a metal with a heavy fermion ground state. However, under applied pressure a transition to an insulating, nonmagnetic state occurs. Powder x-ray diffraction has been used to study structural changes associated with this transition, and reveals that the ambient-pressure Fd3¯m spinel structure distorts to a monoclinic cell of C2/m,C2, or Cm symmetry above 11 GPa at low temperatures. The changes of structure and properties provide evidence for orbital molecule formation in the cubic phase at high pressures and low temperatures that leads to long-range orbital molecule order in the monoclinic phase.

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  • Received 11 September 2019

DOI:https://doi.org/10.1103/PhysRevMaterials.4.015002

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Alexander J. Browne1, Edward J. Pace1, Gaston Garbarino2, and J. Paul Attfield1,*

  • 1Centre for Science at Extreme Conditions and School of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3FD, United Kingdom
  • 2ESRF, The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France

  • *Corresponding author: j.p.attfield@ed.ac.uk

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Vol. 4, Iss. 1 — January 2020

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