Excitations in a quantum spin liquid with random bonds

D. Hüvonen, S. Zhao, G. Ehlers, M. Månsson, S. N. Gvasaliya, A. Zheludev

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18 Scopus citations

Abstract

We present the results of an inelastic neutron-scattering study on two bond disordered quasi-two-dimensional quantum magnets (C4H 12N2)Cu2(Cl1-xBrx) 6 with x=0.035 and 0.075. We observe an increase of spin gap, a reduction of magnon bandwidth, and a decrease of magnon lifetimes compared to the x=0 sample. Additional magnon damping is observed at higher energies away from the zone center, which is found to follow the density of single-particle states.

Original languageEnglish
Article number214408
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number21
DOIs
StatePublished - Dec 10 2012

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