Spectral and Thermodynamic Properties of a Strong-Leg Quantum Spin Ladder

D. Schmidiger, P. Bouillot, S. Mühlbauer, S. Gvasaliya, C. Kollath, T. Giamarchi, and A. Zheludev
Phys. Rev. Lett. 108, 167201 – Published 16 April 2012
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Abstract

The strong-leg S=1/2 Heisenberg spin ladder system (C7H10N)2CuBr4 is investigated using density matrix renormalization group calculations, inelastic neutron scattering, and bulk magnetothermodynamic measurements. Measurements showed qualitative differences compared to the strong-rung case. A long-lived two-triplon bound state is confirmed to persist across most of the Brillouin zone in a zero field. In applied fields, in the Tomonaga-Luttinger spin-liquid phase, elementary excitations are attractive, rather than repulsive. In the presence of weak interladder interactions, the strong-leg system is considerably more prone to three-dimensional ordering.

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  • Received 19 December 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.167201

© 2012 American Physical Society

Authors & Affiliations

D. Schmidiger1, P. Bouillot2, S. Mühlbauer1, S. Gvasaliya1, C. Kollath3, T. Giamarchi2, and A. Zheludev1,*

  • 1Neutron Scattering and Magnetism, Laboratory for Solid State Physics, ETH,† Zurich, Switzerland
  • 2DPMC-MaNEP, University of Geneva, CH-1211 Geneva, Switzerland
  • 3Departement de Physique Théorique, Université de Genève, 1211 Genève, Switzerland

  • *zhelud@ethz.ch
  • http://www.neutron.ethz.ch/

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Issue

Vol. 108, Iss. 16 — 20 April 2012

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