Dynamic Spin Ice: ${\mathrm{Pr}}_{2}{\mathrm{Sn}}_{2}{\mathbf{O}}_{7}$

Dynamic Spin Ice: $\Pr_{2} {Sn}_{2} O_{7}$

H. D. Zhou, C. R. Wiebe, J. A. Janik, L. Balicas, Y. J. Yo, Y. Qiu, J. R. D. Copley, and J. S. Gardner

Phys. Rev. Lett. 101, 227204 – Published 26 November 2008

Abstract

In this Letter, we report a new spin ice— $\Pr_{2} {Sn}_{2} O_{7}$ —which appears to have enhanced residual entropy due to the dynamic nature of the spins. Neutron scattering experiments show that at 200 mK, there is a significant amount of magnetic diffuse scattering which can be fit to the dipolar spin-ice model. However, these short-ranged ordered spins have a quasielastic response that is atypical of the canonical spin ices, and suggests that the ground state is dynamic (i.e., composed of locally ordered two-in–two-out spin configurations that can tunnel between energetically equivalent orientations). We report this as an example of a dynamic spin ice down to 200 mK.

Received 13 April 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.227204

Authors & Affiliations

H. D. Zhou^1,2, C. R. Wiebe^1,2,*, J. A. Janik^1,2, L. Balicas², Y. J. Yo², Y. Qiu^3,4, J. R. D. Copley³, and J. S. Gardner^3,5

¹Department of Physics, Florida State University, Tallahassee, Florida 32306-3016, USA
²National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA
³NIST Center for Neutron Research, Gaithersburg, Maryland, 20899-8102, USA
⁴Department of Materials Science and Engineering, University of Maryland, College Park, Maryland, 20742, USA
⁵Indiana University, 2401 Milo B. Sampson Lane, Bloomington, Indiana 47408, USA

^*cwiebe@magnet.fsu.edu

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Vol. 101, Iss. 22 — 28 November 2008

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Physical Review Letters

Dynamic Spin Ice: Pr2Sn2O7

H. D. Zhou, C. R. Wiebe, J. A. Janik, L. Balicas, Y. J. Yo, Y. Qiu, J. R. D. Copley, and J. S. Gardner

Phys. Rev. Lett. 101, 227204 – Published 26 November 2008

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Dynamic Spin Ice: $\Pr_{2} {Sn}_{2} O_{7}$