2004/06/14 by Ryuji Higashinaka, Hideto Fukazawa, K. Deguchi +3
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Condensed matter physics #Configuration entropy #Frustration #Geometrical frustration #Heat capacity #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetic refrigeration #Magnetization #Materials science #Paramagnetism #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Residual entropy #Specific heat #Spin ice #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1143/jpsj.73.2845
14 pages, 7 figures
arxiv created 2004/06/14 · openalex publication_date 2004/10/15 · arxiv updated 2009/12/01 · openalex created_date 2017/06/23 · openalex updated_date 2026/08/05
We report the specific heat of single crystals of the spin ice compound Dy2Ti2O7 at temperatures down to 100 mK in the so-called Kagome ice state. In our previous paper, we showed the anisotropic release of residual entropy in different magnetic field directions and reported new residual entropy associated with spin frustration in the Kagome slab for field in the [111] direction. In this paper, we confirm the first-order phase transition line in the field-temperature phase diagram and the presence of a critical point at (0.98 T, 400 mK), previously reported from the magnetization and specific-heat data. We newly found another peak in the specific heat at 1.25 T below 0.3 K. One possible explanation for the state between 1 T and 1.25 T is the coexistence of states with different spin configurations including the 2-in 2-out one (Kagome ice state), the 1-in 3-out state (ordered state) and paramagnetic one (free-spin state).