High-temperature onset of field-induced transitions in the spin-ice compound Dy${}_{2}$Ti${}_{2}$O${}_{7}$

High-temperature onset of field-induced transitions in the spin-ice compound Dy $_{2}$ Ti $_{2}$ O $_{7}$

M. J. Matthews, C. Castelnovo, R. Moessner, S. A. Grigera, D. Prabhakaran, and P. Schiffer

Phys. Rev. B 86, 214419 – Published 19 December 2012

Abstract

We have studied the field-dependent ac magnetic susceptibility of single crystals of Dy $_{2}$ Ti $_{2}$ O $_{7}$ spin ice along the [111] direction in the temperature range 1.8–7 K. Our data reflect the onset of local spin-ice order in the appearance of different field regimes. In particular, we observe a prominent feature at approximately 1.0 T that is a precursor of the low-temperature metamagnetic transition out of field-induced kagome ice, below which the kinetic constraints imposed by the ice rules manifest themselves in a substantial frequency dependence of the susceptibility. Despite the relatively high temperatures, our results are consistent with a monopole picture, and they demonstrate that such a picture can give physical insight into spin-ice systems even outside the low-temperature, low-density limit where monopole excitations are well-defined quasiparticles.

Received 6 July 2012

DOI:https://doi.org/10.1103/PhysRevB.86.214419

Authors & Affiliations

M. J. Matthews¹, C. Castelnovo^2,*, R. Moessner³, S. A. Grigera^4,5, D. Prabhakaran⁶, and P. Schiffer^7,†

¹Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA
²South East Physics Network and Hubbard Theory Consortium, Department of Physics, Royal Holloway University of London, Egham TW20 0EX, United Kingdom
³Max-Planck-Institut für Physik komplexer Systeme, Dresden 01187, Germany
⁴SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, United Kingdom
⁵Instituto de Física de Líquidos y Sistemas Biológicos, UNLP-CONICET, La Plata 1900, Argentina
⁶Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom
⁷Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080, USA

^*moved to the TCM group, Cavendish Laboratory, 19 J J Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
^†Corresponding author: pschiffe@illinois.edu

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Issue

Vol. 86, Iss. 21 — 1 December 2012

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