title: Supercooled spin liquid state in the frustrated pyrochlore Dy2Ti2O7.
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 ε(ω, 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 χ (ω, T), a general KWW form for the realtime 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.
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853;
authors.forename: Ethan R
authors.initials: ER
authors.lastname: Kassner
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853;
authors.forename: Azar B
authors.initials: AB
authors.lastname: Eyvazov
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853; Department of Physics, Stanford University, Palo Alto, CA 94301;
authors.forename: Benjamin
authors.initials: B
authors.lastname: Pichler
authors.affiliation: Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, Canada, L8S 4L8; Department of Physics, McMaster University, Hamilton, ON, Canada, L8S 4M1;
authors.forename: Timothy J S
authors.initials: TJ
authors.lastname: Munsie
authors.affiliation: Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, Canada, L8S 4L8;
authors.forename: Hanna A
authors.initials: HA
authors.lastname: Dabkowska
authors.affiliation: Brockhouse Institute for Materials Research, McMaster University, Hamilton, ON, Canada, L8S 4L8; Department of Physics, McMaster University, Hamilton, ON, Canada, L8S 4M1; Canadian Institute for Advanced Research, Toronto, ON, Canada M5G 1Z8;
authors.forename: Graeme M
authors.initials: GM
authors.lastname: Luke
authors.affiliation: Laboratory of Atomic and Solid State Physics, Department of Physics, Cornell University, Ithaca, NY 14853; Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY 11973; School of Physics, University of St. Andrews, St. Andrews, Fife KY16 9SS, United Kingdom; Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, NY 14850 jcseamusdavis@gmail.com.
authors.forename: J C Séamus
authors.initials: JC
authors.lastname: Davis
keywords: magnetic dynamics; periodic boundaries; spin liquid; supercooled liquids