Abstract
Magnetic amplitude mode excitations have been generally observed in quantum spin dimers near a quantum critical point. This paper presents an unusual observation and explanation of such magnetic excitations in three-dimensional $S$ = 3/2 spin dimers Cr${}_{2}$TeO${}_{6}$ and Cr${}_{2}$WO${}_{6}$, even though these two compounds are away from the quantum critical point with the ordered moment reduced by only ~24%.
Highlights
Quasiparticles in condensed-matter systems can behave analogously to those investigated in nuclear and particle physics
We present an unanticipated observation of amplitude modes in the magnetic excitation spectra of Cr2TeO6 and Cr2WO6, both of which are away from a quantum critical point (QCP), via inelastic neutron scattering (INS) measurements
We have studied magnetic excitations of S = 3/2 spin dimers Cr2WO6 and Cr2TeO6 by inelastic neutron scattering
Summary
Quasiparticles in condensed-matter systems can behave analogously to those investigated in nuclear and particle physics. In condensed-matter systems Higgs-like quasiparticles, sometimes referred to as Higgs modes the analog may be partially complete, are collective excitations associated with amplitude fluctuations of the order parameter They have been found in certain superconductors [6,7,8,9], collections of ultracold atoms [10], density-wave systems [11,12,13], and quantum antiferromagnets [14,15,16,17,18,19,20,21,22]. Both compounds exhibit a long-range antiferromagnetic order with Néel temperatures TN = 93 K for Cr2TeO6 and TN = 45 K for Cr2WO6, respectively, implying the important role of interdimer interactions. This implies that they are not in the vicinity of a QCP, the observation of amplitude modes is naively not anticipated
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