Persistence of magnons in a site-diluted dimerized frustrated antiferromagnet |
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Authors: | Stone M B Podlesnyak A Ehlers G Huq A Samulon E C Shapiro M C Fisher I R |
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Institution: | Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. stonemb@ornl.gov |
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Abstract: | We present inelastic neutron scattering and thermodynamic measurements characterizing the magnetic excitations in a disordered spin-liquid antiferromagnet with non-magnetic substitution. The parent compound Ba(3)Mn(2)O(8) is a dimerized, quasi-two-dimensional geometrically frustrated quantum disordered antiferromagnet. We substitute this compound with non-magnetic V(5+) for the S=1 Mn(5+) ions, Ba(3)(Mn(1-x)V (x))(2)O(8), and find that the singlet-triplet excitations which dominate the spectrum of the parent compound persist for the full range of substitution examined, up to x=0.3. We also observe additional low-energy magnetic fluctuations which are enhanced at the greatest substitution values. |
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