From Spin Glass to Quantum Spin Liquid Ground States in Molybdate Pyrochlores

L. Clark*, G. J. Nilsen, E. Kermarrec, G. Ehlers, K. S. Knight, A. Harrison, J. P. Attfield, B. D. Gaulin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We present new magnetic heat capacity and neutron scattering results for two magnetically frustrated molybdate pyrochlores: S = 1 oxide Lu2Mo2O7 and S = 1/2 oxynitride Lu2Mo2O5N2. Lu2Mo2O7 undergoesa transition to an unconventional spin glass ground state at T-f similar to 16 K. However, the preparation of the corresponding oxynitride tunes the nature of the ground state from spin glass to quantum spin liquid. The comparison of the static and dynamic spin correlations within the oxide and oxynitride phases presented here reveals the crucial role played by quantum fluctuations in the selection of a ground state. Furthermore, we estimate an upper limit for a gap in the spin excitation spectrum of the quantum spin liquid state of the oxynitride of Delta similar to 0.05 meV or Delta/vertical bar theta vertical bar similar to 0.004, in units of its antiferromagnetic Weiss constant. theta similar to -121 K.

Original languageEnglish
Article number117201
Number of pages5
JournalPhysical Review Letters
Volume113
Issue number11
DOIs
Publication statusPublished - 8 Sep 2014

Keywords

  • ANTIFERROMAGNET Y2MO2O7
  • ABSORPTION CORRECTION
  • MAGNETIC SCATTERING
  • FRUSTRATED MAGNETS
  • POLARIZED NEUTRONS
  • BEHAVIOR
  • MULTIDETECTOR
  • Y1-XSCXMN2
  • FREEDOM
  • SM3SE4

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