Field-controlled magnetic order in the quantum spin-ladder system (Hpip)2CuBr4

B. Thielemann, C. Rüegg, K. Kiefer, H.M. Rønnow, B. Normand, P. Bouillot, C. Kollath, E. Orignac, R. Citro, T. Giamarchi, A.M. Läuchli, D. Biner, K.W. Krämer, F. Wolff-Fabris, V.S. Zapf, M. Jaime, J. Stahn, Niels Bech Christensen, B. Grenier, D.F. McMorrowJ. Mesot

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    Abstract

    Neutron diffraction is used to investigate the field-induced, antiferromagnetically ordered state in the two-leg spin-ladder material (Hpip)(2)CuBr4. This "classical" phase, a consequence of weak interladder coupling, is nevertheless highly unconventional: its properties are influenced strongly by the spin Luttinger-liquid state of the ladder subunits. We determine directly the order parameter (transverse magnetization), the ordering temperature, the spin structure, and the critical exponents around the transition. We introduce a minimal microscopic model for the interladder coupling and calculate the quantum fluctuation corrections to the mean-field interaction.
    Original languageEnglish
    JournalPhysical Review B Condensed Matter
    Volume79
    Issue number2
    Pages (from-to)020408
    ISSN0163-1829
    DOIs
    Publication statusPublished - 2009

    Bibliographical note

    Copyright (2009) by the American Physical Society.

    Keywords

    • Materials characterization and modelling
    • Materials research

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