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

Mukhopadhyay, Sutirtha and Klanjšek, Martin and Grbić, Mihael Srđan and Blinder, Remi and Mayaffre, Hadrien and Berthier, Claude and Horvatić, Mladen and Continentino, Mucio Amado and Paduan-Filho, Armando and Chiari, Brunetto and Piovesana, Olivo (2012) Quantum-Critical Spin Dynamics in Quasi-One-Dimensional Antiferromagnets. Physical Review Letters, 109 (17). pp. 177206-5. ISSN 0031-9007

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By means of nuclear spin-lattice relaxation rate 1/T1, 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 NiCl2-4SC(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, 1/T1 exhibits a pronounced, continuous variation, which is shown to scale in accordance with quantum criticality. We extract the critical exponent for 1/T1, compare it to the theory, and show that this behavior is identical in both studied systems, thus demonstrating the universality of quantum-critical behavior.

Item Type: Article
Keywords: magentism, onedimensionality, NMR, scaling
Date: October 2012
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-1191458-1022
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 03 Jun 2014 07:51
Last Modified: 23 Feb 2016 15:53
URI: http://digre.pmf.unizg.hr/id/eprint/2139

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