Specific heat of Dy2Ti2O7 in magnetic fields: comparison between single-crystalline and polycrystalline data

• Published in: The Journal of physics and chemistry of solids Vol. 63; no. 6-8; pp. 1043 - 1046
• Main Authors: HIGASHINAKA, R, FUKAZAWA, H, YANAGISHIMA, D, MAENO, Y
• Format: Conference Proceeding Journal Article
• Language: English
• Published: Oxford Elsevier 2002
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Critical-point effects, specific heats, short-range order; Exact sciences and technology; Magnetic properties and materials; Physics; Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.); Field oriented; Schottky effect; Ternary compounds; Transition element compounds; Magnetic field effects; Polycrystals; Spin ice; Rare earth compounds; Experimental study; Titanium oxides; Specific heat; Zeeman effect; Monocrystals; Anisotropy; Ising model; Dysprosium oxides
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/S0022-3697(02)00065-3

Authors report the specific heat of single crystals of the spin ice compound Dy2Ti2O7 under magnetic fields down to 1.8 K. Polycrystalline results down to 0.4 K are consistent with the previous report by Ramirez et al. For the magnetic field along the [100] direction, Cspin/T is interpreted as one Schottky peak characterized by the Zeemann splitting of the Ising levels of all four equivalent spins for each tetrahedron. However, for the magnetic field along the [111] direction, Cspin/T is interpreted as two-component Schottky peak reflecting the fact that there are two kinds of spin components. Along the [110] direction, it is also interpreted as two-component Schottky peak because of experimental misalignment. Authors found that the features of the polycrystalline data in magnetic fields cannot be reconstructed by simply taking appropriate averages of the present anisotropic single-crystalline data. 6 refs.