Chain-based order and quantum spin liquids in dipolar spin ice

P. A. McClarty, O. Sikora, R. Moessner, K. Penc, F. Pollmann, N. Shannon

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Abstract

Recent experiments on the spin-ice material Dy2Ti2O7 suggest that the Pauling "ice entropy," characteristic of its classical Coulombic spin-liquid state, may be lost at low temperatures [Pomaranski, Nat. Phys. 9, 353 (2013)1745-247310.1038/nphys2591]. However, despite nearly two decades of intensive study, the nature of the equilibrium ground state of spin ice remains uncertain. Here we explore how long-range dipolar interactions D, short-range exchange interactions, and quantum fluctuations combine to determine the ground state of dipolar spin ice. We identify the organizational principle that ordered ground states are selected from a set of "chain states" in which dipolar interactions are exponentially screened. Using both quantum and classical Monte Carlo simulation, we establish phase diagrams as a function of quantum tunneling g and temperature T, and find that only a very small gcaD is needed to stabilize a quantum spin liquid ground state. We discuss the implications of these results for Dy2Ti2O7.

Original languageEnglish
Article number094418
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number9
DOIs
Publication statusPublished - Sep 11 2015

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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