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Nuclear magnetic resonance studies of pseudospin fluctuations in URu$_2$Si$_2$

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arxiv 1311.3289 v1 pith:5TISXDNV submitted 2013-11-13 cond-mat.str-el

K. R. Shirer , J. T. Haraldsen , A. P. Dioguardi , J. Crocker , N. apRoberts-Warren , A. C. Shockley , C.-H. Lin , D. M. Nisson
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J. C. Cooley M. Janoschek K. Huang N. Kanchanavatee M. B. Maple M. J. Graf A. V. Balatsky N. J. Curro
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classification cond-mat.str-el
keywords fluctuationsorderbehaviordataevidencehiddenparamagneticpseudogap
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abstract

We report $^{29}$Si NMR measurements in single crystals and aligned powders of URu$_2$Si$_2$ in the hidden order and paramagnetic phases. The spin-lattice-relaxation data reveal evidence of pseudospin fluctuations of U moments in the paramagnetic phase. We find evidence for partial suppression of the density of states below 30 K, and analyze the data in terms of a two component spin-fermion model. We propose that this behavior is a realization of a pseudogap between the hidden order transition $T_{HO}$ and 30 K. This behavior is then compared to other materials that demonstrate precursor fluctuations in a pseudogap regime above a ground state with long-range order.

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