Supercooled spin liquid state in the frustrated pyrochlore Dy2Ti2O7

Ethan R. Kassner, Azar B. Eyvazov, Benjamin Pichler, Timothy J. S. Munsie, Hanna A. Dabkowska, Graeme M. Luke, James C Davis

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

A "supercooled" liquid develops when a fluid does not crystallize upon cooling below its ordering temperature. Instead, the microscopic relaxation times diverge so rapidly that, upon further cooling, equilibration eventually becomes impossible and glass formation occurs. Classic supercooled liquids exhibit specific identifiers including microscopic relaxation times diverging on a Vogel-Tammann-Fulcher (VTF) trajectory, a Havriliak-Negami (HN) form for the dielectric function epsilon(omega,T), and a general Kohlrausch-Williams-Watts (KWW) form for time-domain relaxation. Recently, the pyrochlore Dy2Ti2O7 has become of interest because its frustrated magnetic interactions may, in theory, lead to highly exotic magnetic fluids. However, its true magnetic state at low temperatures has proven very difficult to identify unambiguously. Here, we introduce high-precision, boundary-free magnetization transport techniques based upon toroidal geometries and gain an improved understanding of the time-and frequency-dependent magnetization dynamics of Dy2Ti2O7. We demonstrate a virtually universal HN form for the magnetic susceptibility chi(omega, T), a general KWW form for the real-time magnetic relaxation, and a divergence of the microscopic magnetic relaxation rates with the VTF trajectory. Low-temperature Dy2Ti2O7 therefore exhibits the characteristics of a supercooled magnetic liquid. One implication is that this translationally invariant lattice of strongly correlated spins may be evolving toward an unprecedented magnetic glass state, perhaps due to many-body localization of spin.

Original languageEnglish
Pages (from-to)8549-8554
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number28
Early online date30 Jun 2015
DOIs
Publication statusPublished - 14 Jul 2015

Keywords

  • Spin liquid
  • Supercooled liquids
  • Magnetic dynamics
  • Periodic boundaries
  • Magnetic monopoles
  • Ice
  • Dynamics
  • Entropy

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