Magnetothermal study of a Dy-stuffed spin ice: Dy2 (Dyx Ti2-x) O7-x/2

B. G. Ueland, G. C. Lau, R. S. Freitas, J. Snyder, M. L. Dahlberg, B. D. Muegge, E. L. Duncan, R. J. Cava, P. Schiffer

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied the thermodynamics of the stuffed spin ice material, Dy2 (Dyx Ti2-x) O7-x/2, in which additional Dy3+ replace Ti4+ in the pyrochlore Dy2 Ti2 O7. 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.

Original languageEnglish (US)
Article number144412
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number14
DOIs
StatePublished - Apr 10 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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