Slow spin relaxation in a highly polarized cooperative paramagnet

Details Slow spin relaxation in a highly polarized cooperative paramagnet Slow spin relaxation in a highly polarized cooperative paramagnet

2005-11-29

arxiv.org/abs/cond-mat/0511716v1

Phys. Rev. Lett. 96, 027216 (2006)

Physics

Condensed Matter

Statistical Mechanics

Accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.027216

We report measurements of the ac susceptibility of the cooperative paramagnet Tb2Ti2O7 in a strong magnetic field. Our data show the expected saturation maximum in chi(T) and also an unexpected low frequency dependence (< 1 Hz) of this peak, suggesting very slow spin relaxations are occurring. Measurements on samples diluted with nonmagnetic Y3+ or Lu3+ and complementary measurements on pure and diluted Dy2Ti2O7 strongly suggest that the relaxation is associated with dipolar spin correlations, representing unusual cooperative behavior in a paramagnetic system.

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