Field-induced quantum-disordered phases in S=12 weakly coupled dimer systems with site dilution

Tommaso Roscilde
Phys. Rev. B 74, 144418 – Published 20 October 2006

Abstract

In the present paper we discuss the rich phase diagram of S=12 weakly coupled dimer systems with site dilution as a function of an applied uniform magnetic field. Performing quantum Monte Carlo simulations on a site-diluted bilayer system, we find a sequence of three distinct quantum-disordered phases induced by the field. Such phases divide a doping-induced order-by-disorder phase at low fields from a field-induced ordered phase at intermediate fields. The three quantum disordered phases are a gapless disordered-free-moment phase, a gapped plateau phase, and two gapless Bose-glass phases. Each of the quantum-disordered phases have distinct experimental signatures that make them observable through magnetometry and neutron scattering measurements. In particular the Bose-glass phase is characterized by an unconventional magnetization curve whose field dependence is exponential. Making use of a local-gap model, we relate directly this behavior to the statistics of rare events in the system.

    • Received 2 March 2006

    DOI:https://doi.org/10.1103/PhysRevB.74.144418

    ©2006 American Physical Society

    Authors & Affiliations

    Tommaso Roscilde

    • Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-strasse 1, 85748 Garching, Germany and Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA

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    Issue

    Vol. 74, Iss. 14 — 1 October 2006

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