paper

First Order Transition in the Spin Dynamics of Geometrically Frustrated Yb2Ti2O7

arXiv:cond-mat/0201166 · doi:10.1103/PhysRevLett.88.077204

Abstract

Using neutron diffraction, 170Yb Mossbauer and muSR spectroscopies, we have examined the pyrochlore Yb2Ti2O7 where the Yb3+ S'=1/2 ground state has planar anisotropy. Below ~0.24K, the temperature of the known specific heat lambda transition, there is no long range magnetic order. We show that the transition corresponds to a first order change in the fluctuation rate of the Yb3+ spins. Above the transition temperature, the rate, in the GHz range, follows a thermal excitation law, whereas below, the rate, in the MHz range, is essentially temperature independent indicative of a quantum fluctuation regime.

4 pages, 4 postscript figures (one double with 2 ps files)

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