Thermodynamics of the Spin Luttinger Liquid in a Model Ladder Material

Ch. Rüegg, K. Kiefer, B. Thielemann, D. F. McMorrow, V. Zapf, B. Normand, M. B. Zvonarev, P. Bouillot, C. Kollath, T. Giamarchi, S. Capponi, D. Poilblanc, D. Biner, and K. W. Krämer
Phys. Rev. Lett. 101, 247202 – Published 10 December 2008

Abstract

The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C5H12N)2CuBr4 is studied by measurements of the specific heat and the magnetocaloric effect. We demonstrate the presence of an extended spin Luttinger-liquid phase between two field-induced quantum critical points and over a broad range of temperature. Based on an ideal spin-ladder Hamiltonian, comprehensive numerical modeling of the ladder specific heat yields excellent quantitative agreement with the experimental data across the entire phase diagram.

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  • Received 19 August 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.247202

©2008 American Physical Society

Authors & Affiliations

Ch. Rüegg1, K. Kiefer2, B. Thielemann3, D. F. McMorrow1, V. Zapf4, B. Normand5, M. B. Zvonarev6, P. Bouillot6, C. Kollath7, T. Giamarchi6, S. Capponi8,9, D. Poilblanc9,8, D. Biner10, and K. W. Krämer10

  • 1London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom
  • 2BENSC, Helmholtz Centre Berlin for Materials and Energy, D-14109 Berlin, Germany
  • 3Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • 4NHMFL, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 5Institute for Theoretical Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
  • 6DPMC-MaNEP, Université de Geneve, CH-1211 Geneva 4, Switzerland
  • 7Centre de Physique Théorique, École Polytechnique, CNRS, 91128 Palaiseau, France
  • 8Université de Toulouse, UPS, Laboratoire de Physique Théorique, IRSAMC, F-31062 Toulouse, France
  • 9CNRS, UMR 5152, F-31062 Toulouse, France
  • 10Department of Chemistry and Biochemistry, University of Bern, CH-3000 Bern 9, Switzerland

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Vol. 101, Iss. 24 — 12 December 2008

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