Toshio OnoKittiwit MatanYusuke NambuTaku J. SatoKazuya KatayamaSatoshi HirataHidekazu TanakaOsaka Prefecture UniversityMahidol UniversityThEPTohoku UniversityTokyo Institute of Technology2018-11-092018-11-092014-04-15Journal of the Physical Society of Japan. Vol.83, No.4 (2014)13474073003190152-s2.0-84897481972https://repository.li.mahidol.ac.th/handle/20.500.14594/34927Magnetic 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.Mahidol UniversityPhysics and AstronomyArticleSCOPUS10.7566/JPSJ.83.043701