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Title: Large negative quantum renormalization of excitation energies in the spin-1/2 kagome lattice antiferromagnet Cs<inf>2</inf>Cu<inf>3</inf>SnF<inf>12</inf>
Authors: Toshio Ono
Kittiwit Matan
Yusuke Nambu
Taku J. Sato
Kazuya Katayama
Satoshi Hirata
Hidekazu Tanaka
Osaka Prefecture University
Mahidol University
Tohoku University
Tokyo Institute of Technology
Keywords: Physics and Astronomy
Issue Date: 15-Apr-2014
Citation: Journal of the Physical Society of Japan. Vol.83, No.4 (2014)
Abstract: Magnetic excitations in the spin-1/2 distorted kagome lattice antiferromagnet Cs2Cu3SnF12, which has an ordered ground state owing to the strong Dzyaloshinskii-Moriya interaction, were studied using inelastic neutron scattering. Although the spin-wave dispersion can be qualitatively understood in terms of linear spin-wave theory (LSWT), the excitation energies are renormalized by a factor of approximately 0.6 from those calculated by LSWT, almost irrespective of the momentum transfer. This inadequacy of LSWT, which is attributed to quantum fluctuations, provides evidence of negative quantum renormalization in the spin-1/2 kagome lattice antiferromagnet. © 2014 The Physical Society of Japan.
ISSN: 13474073
Appears in Collections:Scopus 2011-2015

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