Statics and dynamics of the highly correlated spin ice Ho${}_{2}$Ge${}_{2}$O${}_{7}$

Statics and dynamics of the highly correlated spin ice Ho $_{2}$ Ge $_{2}$ O $_{7}$

A. M. Hallas, J. A. M. Paddison, H. J. Silverstein, A. L. Goodwin, J. R. Stewart, A. R. Wildes, J. G. Cheng, J. S. Zhou, J. B. Goodenough, E. S. Choi, G. Ehlers, J. S. Gardner, C. R. Wiebe, and H. D. Zhou

Phys. Rev. B 86, 134431 – Published 31 October 2012

Abstract

The pyrochlore Ho $_{2}$ Ge $_{2}$ O $_{7}$ is a new highly correlated spin ice material. Physical property measurements, including x-ray diffraction, dc susceptibility, and ac susceptibility, confirm that it shares the distinctive characteristics of other known spin ices. Polarized neutron scattering measurements on a powder sample, combined with reverse Monte Carlo (RMC) refinements, give unique information about the spin ice state in Ho $_{2}$ Ge $_{2}$ O $_{7}$ . RMC refinements are used to fit the powder magnetic diffuse scattering and predict the single-crystal magnetic scattering of Ho $_{2}$ Ge $_{2}$ O $_{7}$ , demonstrating consistency with spin ice behavior.

Received 13 July 2012

DOI:https://doi.org/10.1103/PhysRevB.86.134431

Authors & Affiliations

A. M. Hallas¹, J. A. M. Paddison^2,3, H. J. Silverstein¹, A. L. Goodwin², J. R. Stewart³, A. R. Wildes⁴, J. G. Cheng⁵, J. S. Zhou⁵, J. B. Goodenough⁵, E. S. Choi⁶, G. Ehlers⁷, J. S. Gardner^8,9, C. R. Wiebe^1,6,10, and H. D. Zhou^6,11

¹Department of Chemistry, University of Manitoba, Winnipeg, MB, Canada R3T 2N2
²Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, United Kingdom
³ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, United Kingdom
⁴Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France
⁵Texas Materials Institute, University of Texas at Austin, Austin, Texas 78712, USA
⁶National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306-4005, USA
⁷Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6475, USA
⁸NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102, USA
⁹Indiana University, 2401 Milo B. Sampson Lane, Bloomington, Indiana 47408, USA
¹⁰Department of Chemistry, University of Winnipeg, Winnipeg, MB, Canada R3B 2E9
¹¹Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996-1200, USA

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Vol. 86, Iss. 13 — 1 October 2012

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