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Persistent dynamics in the S=1/2 quasi-one-dimensional chain compound Rb4Cu(MoO4)3 probed with muon-spin relaxation

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arxiv 1203.1161 v1 pith:KD5E4W2L submitted 2012-03-06 cond-mat.str-el

Persistent dynamics in the S=1/2 quasi-one-dimensional chain compound Rb4Cu(MoO4)3 probed with muon-spin relaxation

T. Lancaster , P.J. Baker , F.L. Pratt , S.J. Blundell , W. Hayes , D. Prabhakaran This is my paper
classification cond-mat.str-el
keywords spinantiferromagnetexchangeexcitationsmoo4muon-spinpersistentratio
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We report the results of muon-spin relaxation measurements on the low-dimensional antiferromagnet Rb4Cu(MoO4)3. No long-range magnetic order is observed down to 50 mK implying a ratio T_N/J<0.005 (where J is the principal exchange strength along the spin chains) and an effective ratio of interchain to intrachain exchange of |J_perp/J|<2 x 10^-3, making the material an excellent realization of a one-dimensional quantum Heisenberg antiferromagnet. We probe the persistent spin excitations at low temperatures and find that ballistic spin transport dominates the excitations detected below 0.3 K.

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