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Phys. Rev. B 77, 144412 (2008) [5 pages]

Magnetothermal study of a Dy-stuffed spin ice: Dy2(DyxTi2−x)O7−x/2

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B. G. Ueland1,*, G. C. Lau2, R. S. Freitas1,†, J. Snyder1,‡, M. L. Dahlberg1, B. D. Muegge2, E. L. Duncan2, R. J. Cava2, and P. Schiffer1,§
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

Received 13 November 2007; revised 15 January 2008; published 10 April 2008

We have studied the thermodynamics of the stuffed spin ice material, Dy2(DyxTi2−x)O7−x/2, in which additional Dy3+ replace Ti4+ in the pyrochlore Dy2Ti2O7. Heat capacity measurements indicate that these materials lose the spin ice zero point entropy for x≥0.3, sharply contrasting with results on the analogous Ho materials. A finite ac susceptibility is observed as T→0 in both the Ho and Dy materials with x=0.67, which suggests that spin fluctuations persist down to T∼0. We propose that both the entropy and susceptibility data may be explained as a result of domains of local pyrochlore type structural order in these materials.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.144412
DOI:
10.1103/PhysRevB.77.144412
PACS:
75.50.Lk, 75.30.Hx, 75.40.Cx, 75.30.Cr

*Present address: NIST Center for Neutron Research, National Institute if Standards and Technology, Gaithersburg, MD 20899.

†Present address: Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, 05315-970, São Paulo, SP, Brazil.

‡Present address: Scientific Instruments, Inc., West Palm Beach, FL 33407.

§Corresponding author; pes12@psu.edu

 
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