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Critical properties of coupled anisotropic Haldane spin chains in a magnetic field

A. K. Bera, B. Lake, A. T. M. N. Islam, and A. Schneidewind
Phys. Rev. B 92, 060412(R) – Published 25 August 2015

Abstract

We use inelastic neutron scattering to measure magnetic fluctuations as a function of transverse magnetic field and temperature in a single crystal of the coupled Haldane chain compound SrNi2V2O8 with uniaxial anisotropy. At the base temperature (2 K), spin excitations confirm a field-induced quantum phase transition from the disordered Haldane (gapped singlet) state to a gapped long-range ordered state through a quantum critical point (QCP) (μ0Hc11.5 T). At elevated temperatures in the vicinity of the QCP, both the energy and linewidth of the lowest triplet mode scale linearly with temperature, in accordance with quantum criticality. We also demonstrate that the experimental field dependence of the triplet excitation modes at the base temperature is in agreement with the bosonic and macroscopic models, but is in contrast to the fermionic and perturbative models.

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  • Received 29 June 2015

DOI:https://doi.org/10.1103/PhysRevB.92.060412

©2015 American Physical Society

Authors & Affiliations

A. K. Bera1,*, B. Lake1,2, A. T. M. N. Islam1, and A. Schneidewind3

  • 1Helmholtz-Zentrum Berlin für Materialien und Energie, D-14109 Berlin, Germany
  • 2Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany
  • 3Jülich Centre for Neutron Science JCNS-FRM II, Forschungszentrum Jülich GmbH, Outstation at FRM II, D-85747 Garching, Germany

  • *anup.bera@helmholtz-berlin.de

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Vol. 92, Iss. 6 — 1 August 2015

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