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

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https://link.aps.org/doi/10.1103/PhysRevMaterials.4.015002
Original languageEnglish
JournalPhysical Review Materials
Volume4
Issue number1
Early online date21 Jan 2020
DOIs
Publication statusE-pub ahead of print - 21 Jan 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 F d3¯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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