Quantum Spin Ice Dynamics in the Dipole-Octupole Pyrochlore Magnet Ce2Zr2O7 Academic Article uri icon

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abstract

  • Neutron scattering measurements on the pyrochlore magnet Ce_{2}Zr_{2}O_{7} reveal an unusual crystal field splitting of its lowest J=5/2 multiplet, such that its ground-state doublet is composed of m_{J}=±3/2, giving these doublets a dipole-octupole (DO) character with local Ising anisotropy. Its magnetic susceptibility shows weak antiferromagnetic correlations with θ_{CW}=-0.4(2)  K, leading to a naive expectation of an all-in, all-out ordered state at low temperatures. Instead, our low-energy inelastic neutron scattering measurements show a dynamic quantum spin ice state, with suppressed scattering near |Q|=0, and no long-range order at low temperatures. This is consistent with recent theory predicting symmetry-enriched U(1) quantum spin liquids for such DO doublets decorating the pyrochlore lattice. Finally, we show that disorder, especially oxidation of powder samples, is important in Ce_{2}Zr_{2}O_{7} and could play an important role in the low-temperature behavior of this material.

authors

  • Gaudet, J
  • Smith, EM
  • Dudemaine, J
  • Beare, J
  • Buhariwalla, CRC
  • Butch, NP
  • Stone, MB
  • Kolesnikov, AI
  • Xu, Guangyong
  • Yahne, DR
  • Ross, KA
  • Marjerrison, CA
  • Garrett, JD
  • Luke, Graeme
  • Bianchi, AD
  • Gaulin, BD

publication date

  • May 10, 2019