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Magnetic field induced transition in vanadium spinels.

E D Mun1, Gia-Wei Chern2, V Pardo3

  • 1NHMFL Materials Physics and Applications, T-4 and CNLS, Los Alamos Laboratory (LANL), Los Alamos, New Mexico 87545, USA.

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|February 4, 2014
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Summary

We observed a field-induced quantum phase transition in vanadium spinels (AV2O4). This transition in MgV2O4 and multiferroic CdV2O4 affects magnetic order and electric polarization, explained by crystal field effects.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Magnetism

Background:

  • Vanadium spinels (AV2O4) exhibit complex magnetic behaviors.
  • Strong spin-orbit coupling is characteristic of these materials.
  • Understanding field-induced transitions is crucial for novel magnetic materials.

Purpose of the Study:

  • To investigate the magnetic properties of CdV2O4 and MgV2O4 under high pulsed magnetic fields.
  • To identify and characterize field-induced quantum phase transitions.
  • To elucidate the role of crystal field effects in these transitions.

Main Methods:

  • Experiments using pulsed magnetic fields up to 65 Tesla.
  • Magnetization measurements on single-crystal samples.
  • Theoretical modeling incorporating spin-orbit coupling and trigonal crystal fields.

Main Results:

  • A distinct jump in magnetization observed in MgV2O4 at approximately 40 Tesla, signaling a quantum phase transition.
  • Suppression of electric polarization in multiferroic CdV2O4 concurrent with the field-induced transition.
  • Successful modeling of experimental results by including local trigonal crystal field effects.

Conclusions:

  • The study reveals field-induced quantum phase transitions in vanadium spinels.
  • Trigonal crystal field effects are key to understanding the observed magnetic and electric responses.
  • These findings provide insights into the control of magnetic order and multiferroicity.