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Title: Ghost modes and continuum scattering in the dimerized distorted kagome lattice antiferromagnet Rb 2 Cu 3 SnF 12
Authors: K. Matan
Y. Nambu
Y. Zhao
T. J. Sato
Y. Fukumoto
T. Ono
H. Tanaka
C. Broholm
A. Podlesnyak
G. Ehlers
Mahidol University
Tohoku University
University of Maryland
NIST Center for Neutron Research
Tokyo University of Science
Osaka Prefecture University
Tokyo Institute of Technology
Johns Hopkins University
Oak Ridge National Laboratory
Keywords: Materials Science;Physics and Astronomy
Issue Date: 21-Jan-2014
Citation: Physical Review B - Condensed Matter and Materials Physics. Vol.89, No.2 (2014)
Abstract: High-intensity pulsed neutron scattering reveals a new set of magnetic excitations in the pinwheel valence-bond solid state of the distorted kagome lattice antiferromagnet Rb2Cu3SnF12. The polarization of the dominant dispersive modes (2meV<â ω<7meV) is determined and found consistent with a dimer series expansion with strong Dzyaloshinskii-Moriya interactions (D/J=0.18). A weakly dispersive mode near 5 meV and shifted "ghosts" of the main modes are attributed to the enlarged unit cell below a T=215 K structural transition. Continuum scattering between 8 and 10 meV might be interpreted as a remnant of the kagome spinon continuum [Nature (London) 492, 406 (2012).NATUAS0028-083610.1038/nature11659]. © 2014 American Physical Society.
ISSN: 1550235X
Appears in Collections:Scopus 2011-2015

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