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Quantum-Critical Spin Dynamics in Quasi-One-Dimensional Antiferromagnets

S. Mukhopadhyay, M. Klanjšek, M. S. Grbić, R. Blinder, H. Mayaffre, C. Berthier, M. Horvatić, M. A. Continentino, A. Paduan-Filho, B. Chiari, and O. Piovesana
Phys. Rev. Lett. 109, 177206 – Published 26 October 2012
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Abstract

By means of nuclear spin-lattice relaxation rate T11, we follow the spin dynamics as a function of the applied magnetic field in two gapped quasi-one-dimensional quantum antiferromagnets: the anisotropic spin-chain system NiCl24SC(NH2)2 and the spin-ladder system (C5H12N)2CuBr4. In both systems, spin excitations are confirmed to evolve from magnons in the gapped state to spinons in the gapless Tomonaga-Luttinger-liquid state. In between, T11 exhibits a pronounced, continuous variation, which is shown to scale in accordance with quantum criticality. We extract the critical exponent for T11, compare it to the theory, and show that this behavior is identical in both studied systems, thus demonstrating the universality of quantum-critical behavior.

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  • Received 29 August 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.177206

© 2012 American Physical Society

Authors & Affiliations

S. Mukhopadhyay1, M. Klanjšek1,2,3,*, M. S. Grbić1,4, R. Blinder1, H. Mayaffre1, C. Berthier1, M. Horvatić1,†, M. A. Continentino5, A. Paduan-Filho6, B. Chiari7, and O. Piovesana7

  • 1Laboratoire National des Champs Magnétiques Intenses, LNCMI-CNRS (UPR3228), UJF, UPS and INSA, BP 166, 38042 Grenoble Cedex 9, France
  • 2Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
  • 3EN-FIST Centre of Excellence, Dunajska 156, 1000 Ljubljana, Slovenia
  • 4Department of Physics, Faculty of Science, University of Zagreb, PP 331, HR-10002 Zagreb, Croatia
  • 5Centro Brasileiro de Pesquisas Físicas, 22290-180 Rio de Janeiro, Brazil
  • 6Universidade de São Paulo, 05315-970 São Paulo, Brazil
  • 7Dipartimento di Chimica, Universitá di Perugia, I-06100, Perugia, Italy

  • *martin.klanjsek@ijs.si
  • mladen.horvatic@lncmi.cnrs.fr

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Issue

Vol. 109, Iss. 17 — 26 October 2012

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Heating up of Superconductors
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