Phys. Rev. Lett. 96, 027216 (2006) [4 pages]

Slow Spin Relaxation in a Highly Polarized Cooperative Paramagnet

Abstract

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B. G. Ueland¹, G. C. Lau², R. J. Cava², J. R. O’Brien³, and P. Schiffer^1,*
¹Department of Physics and Materials Research Institute, Pennsylvania State University, University Park Pennsylvania 16802, USA
²Department of Chemistry and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08540, USA
³Quantum Design, San Diego, California 92121, USA

Received 14 July 2005; published 20 January 2006

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 χ(T) and also an unexpected frequency dependence of this peak at low frequencies (<1 Hz), 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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.96.027216

DOI:

10.1103/PhysRevLett.96.027216

PACS:

75.30.Cr, 75.40.Cx, 75.40.Gb, 75.50.Ee

^*Electronic address: schiffer@phys.psu.edu

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Phys. Rev. Lett. 96, 027216 (2006) [4 pages]

Slow Spin Relaxation in a Highly Polarized Cooperative Paramagnet