Oxygen miscibility gap and spin glass formation in the pyrochlore Lu2Mo2O7

L. Clark, C. Ritter, A. Harrison, J. P. Attfield*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Rare earth (R) molybdate pyrochlores, R2Mo2O7, are of interest as frustrated magnets. Polycrystalline samples of Lu2Mo2O7-x, prepared at 1600 °C display a coexistence of cubic pyrochlore phases. Rietveld fits to powder neutron diffraction data and chemical analyses show that the miscibility gap is between a stoichiometric x=0 and an oxygen-deficient x ≈ 0.4 phase. Lu2Mo2O7 behaves as a spin glass material, with a divergence of field cooled and zero field cooled DC magnetic susceptibilities at a spin freezing temperature Tf=16 K, that varies with frequency in AC measurements following a Vogel-Fulcher law. Lu2Mo2O6.6 is more highly frustrated spin glass and has Tf=20 K.

Original languageEnglish
Pages (from-to)199-203
Number of pages5
JournalJournal of Solid State Chemistry
Volume203
DOIs
Publication statusPublished - Jul 2013

Keywords

  • Pyrochlore oxides
  • Frustrated magnets
  • Phase separation
  • Y2MO2O7
  • DISORDER
  • BEHAVIOR
  • PHASE
  • OXIDE

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