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Phys. Rev. B 79, 020408(R) (2009) [4 pages]

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

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B. Thielemann1, Ch. Rüegg2, K. Kiefer3, H. M. Rønnow4, B. Normand5, P. Bouillot6, C. Kollath7, E. Orignac8, R. Citro9, T. Giamarchi6, A. M. Läuchli10, D. Biner11, K. W. Krämer11, F. Wolff-Fabris12, V. S. Zapf12, M. Jaime12, J. Stahn1, N. B. Christensen1,13, B. Grenier14, D. F. McMorrow2, and J. Mesot1,4
1Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, CH-5232 Villigen, Switzerland
2London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
3BENSC, Helmholtz Centre Berlin for Materials and Energy, D-14109 Berlin, Germany
4Laboratory for Quantum Magnetism, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
5Theoretische Physik, ETH–Hönggerberg, CH-8093 Zürich, Switzerland
6DPMC-MaNEP, University of Geneva, CH-1211 Geneva, Switzerland
7Centre de Physique Théorique, CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex, France
8LPENSL, UMR 5672, CNRS, F-69364 Lyon Cedex 07, France
9Dipartimento di Fisica “E. R. Caianiello” and CNISM, Università di Salerno, I-84100 Salerno, Italy
10Institut Romand de Recherche Numérique en Physique des Matériaux (IRRMA), CH-1015 Lausanne, Switzerland
11Department of Chemistry and Biochemistry, University of Bern, CH-3000 Bern 9, Switzerland
12MPA-NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
13Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000 Roskilde, Denmark
14INAC/SPSMS/MDN, CEA–Grenoble and Université Joseph Fourier–Grenoble, F-38054 Grenoble, France

Received 2 September 2008; revised 15 December 2008; published 30 January 2009

Neutron diffraction is used to investigate the field-induced, antiferromagnetically ordered state in the two-leg spin-ladder material (Hpip)2CuBr4. 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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.79.020408
DOI:
10.1103/PhysRevB.79.020408
PACS:
75.10.Jm, 75.25.+z, 75.30.Kz, 75.40.Mg
 
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