First Order Transition in the Spin Dynamics of Geometrically Frustrated Yb2Ti2O7

Details First Order Transition in the Spin Dynamics of Geometrically Frustrated Yb2Ti2O7 First Order Transition in the Spin Dynamics of Geometrically Frustrated Yb2Ti2O7

2002-01-11

arxiv.org/abs/cond-mat/0201166v1

Phys. Rev. Lett. 88 (2002) 077204

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.88.077204

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.

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