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

McClarty, P. A. and Sikora, O. and Moessner, R. and Penc, Karlo and Pollmann, F. (2015) Chain-based order and quantum spin liquids in dipolar spin ice. PHYSICAL REVIEW B, 92 (9). ISSN 2469-9950

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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 [D. Po- maranski et al., Nature Phys. 9, 353 (2013)]. 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 a new organisational prin- ciple, namely 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 gc D is needed to stabilize a quantum spin-liquid ground state. We discuss the implications of these results for Dy2Ti2O7.

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