Triplet and in-gap magnetic states in the ground state of the quantum frustrated fcc antiferromagnet Ba2YMoO6

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DOIResolve DOI: http://doi.org/10.1103/PhysRevB.84.100404
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TypeArticle
Journal titlePhysical review. B, Condensed matter and materials physics
Volume84
Issue10
Pages# of pages: 4
AbstractThe geometrically frustrated double perovskite Ba2YMoO6 is characterized by quantum s=1/2 spins at the Mo5+ sites of an undistorted fcc lattice. Previous low-temperature characterization revealed an absence of static long-range magnetic order and suggested a nonmagnetic spin-singlet ground state. We report unique time-of-flight and triple-axis neutron spectroscopy of Ba2YMoO6 that shows a 28 meV spin excitation with a bandwidth of ∼4 meV, which vanishes above ∼125 K. We identify this as the singlet-triplet excitation that arises out of a singlet ground state, and further identify a weaker continuum of magnetic states within the gap, reminiscent of spin-polaron states arising due to weak disorder.
Publication date
LanguageEnglish
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number18702526
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Record identifier31f2e6b4-3919-4d75-878f-c9e3bbb63bb8
Record created2011-11-10
Record modified2016-05-09
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