Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-05-22
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.68.014415
We report the specific heat and entropy of single crystals of the spin ice compound Dy2Ti2O7 at temperatures down to 0.35 K. We apply magnetic fields along the four characteristic directions: [100], [110], [111] and [112]. Because of Ising anisotropy, we observe anisotropic release of the residual zero-point entropy, attributable to the difference in frustration dimensionality. In the high magnetic field along these four directions, the residual entropy is almost fully released and the activation entropy reaches Rln2. However, in the intermediate field region, the entropy in fields along the [111] direction is different from those for the other three field directions. For the [111] direction the frustration structure changes from that of three-dimensional(3D) pyrochlore to that of two-dimensional(2D) Kagome-like lattice with constraint due to the ice rule, leading to different values of zero-point entropy.
Fukazawa Hideto
Higashinaka Ryuji
Maeno Yoshiteru
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