NMR Detection of Temperature-Dependent Magnetic Inhomogeneities in URu2Si2

O. O. Bernal; B. Becker; J. A. Mydosh; G. J. Nieuwenhuys; A. A. Menovsky; P. M. Paulus; H. B. Brom; D. E. Maclaughlin; H. G. Lukefahr; .

doi:10.1016/S0921-4526(99)01192-8

NMR Detection of Temperature-Dependent Magnetic Inhomogeneities in URu2Si2

Strongly Correlated Electrons 2009-10-31 v1

Authors: O. O. Bernal , B. Becker , J. A. Mydosh , G. J. Nieuwenhuys , A. A. Menovsky , P. M. Paulus , H. B. Brom , D. E. Maclaughlin , H. G. Lukefahr , .

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Abstract

We present 29Si-NMR relaxation and spectral data in URu2Si2. Our echo-decay experiments detect slowly fluctuating magnetic field gradients. In addition, we find that the echo-decay shape (time dependence) varies with temperature T and its rate behaves critically near the Neel temperature TN, indicating a correlation between the gradient fluctuations and the transition to small-moment order. T-dependent broadening contributions become visible below 100 Kelvin and saturate somewhat above TN, remaining saturated at lower temperatures. Together, the line width and shift suggest partial lattice distortions below TN. We propose an intrinsic minority phase below $T_{\rm N}$ and compare our results with one of the current theoretical models.

Keywords

29Si-NMR magnetic inhomogeneities URu2Si2 Neel temperature echo-decay experiments

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@article{arxiv.cond-mat/9908460,
  title  = {NMR Detection of Temperature-Dependent Magnetic Inhomogeneities in URu2Si2},
  author = {O. O. Bernal and B. Becker and J. A. Mydosh and G. J. Nieuwenhuys and A. A. Menovsky and P. M. Paulus and H. B. Brom and D. E. Maclaughlin and H. G. Lukefahr and .},
  journal= {arXiv preprint arXiv:cond-mat/9908460},
  year   = {2009}
}

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2 pages RevTeX, 1 figure, SCES 99-Japan, to appear in Physica B

NMR Detection of Temperature-Dependent Magnetic Inhomogeneities in URu2Si2

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