Specific Heat of Kagome Ice in the Pyrochlore Oxide Dy2Ti2O7

Details Specific Heat of Kagome Ice in the Pyrochlore Oxide Dy2Ti2O7 Specific Heat of Kagome Ice in the Pyrochlore Oxide Dy2Ti2O7

2002-11-15

arxiv.org/abs/cond-mat/0211326v1

Physics

Condensed Matter

Materials Science

9 pages, 14 figures, J. Phys. Soc. Jpn, Vol. 72, in press

Scientific paper

10.1143/JPSJ.72.411

A novel macroscopically degenerate state called kagome ice, which was recently found in a spin ice compound Dy2Ti2O7 in a magnetic field applied along the [111] direction of the cubic unit cell, is studied by specific heat measurements. The residual entropy of the kagome ice is estimated to be 0.65 J/K mol Dy, which is nearly 40 % of that for the tetrahedral spin ice obtained in a zero field (1.68 J/K mol Dy) and is in good agreement with a theoretical prediction. It is also reported that the kagom ice state, which is stabilized at a range of magnetic field of 0.3 ~ 0.6 T, is a 'gas' phase and condenses into a 'liquid' phase with nearly zero entropy at a critical field of 1 T.

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