Nuclear magnetic resonance studies of pseudospin fluctuations in URu2Si2.

Authors :: Shirer, K. R.
Haraldsen, T.
Dioguardi, A. P.
Crocker, J.
apRoberts-Warren, N.
Shockley, C.
C.-H. Lin
Nisson, D. M.
Cooley, C.
Janoschek, M.
K. Huang
Kanchanavatee, N.
Maple, M. B.
Graf, M. J.
Balatsky, A. V.
Curro, N. J.
Source :: Physical Review B: Condensed Matter & Materials Physics. Sep2013, Vol. 88 Issue 9, p094436-1-094436-5. 5p.
Publication Year :: 2013
Abstract: We report 29Si nuclear magnetic resonance measurements in single crystals and aligned powders of URu2Si2 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 THO 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. [ABSTRACT FROM AUTHOR]