Journal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
Volume 72, Issue 2, Pages 411-418Publisher
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.72.411
Keywords
spin ice; kagome ice; entropy; specific heat; pyrochlore lattice; DY2Ti2O7
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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 kagome 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 1T.
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