Large negative quantum renormalization of excitation energies in the spin-1/2 kagome lattice antiferromagnet Cs2Cu3SnF 12

Toshio Ono, Kittiwit Matan, Yusuke Nambu, Taku J. Sato, Kazuya Katayama, Satoshi Hirata, Hidekazu Tanaka

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12 Citations (Scopus)

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.

Original languageEnglish
Article number043701
Journaljournal of the physical society of japan
Volume83
Issue number4
DOIs
Publication statusPublished - 2014 Apr 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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