Low temperature specific heat and magnetization of polycrystal HoNi2B2C

Abstract

The low temperature specific heat and magnetization of the reentrant superconductor HoNi2B2C have been measured below 40K. The strong peak due to magnetic phase transition was observed at 5.7K in the specific heat curve. The specific heat jump at the superconducting transition temperature,Tc (=7.5K), was not clear because of in the strong peak. The electronic specific heat coefficient, γ, and the Debye temperature,θD, were estimated as γ=24mJ/mole·K2 andθD=287K. The magnetization curve at 1.6K showed two jumps on 3kOe and 9kOe, and above 20kOe it was almost saturated. The temperature dependence of magnetic susceptibility, η, showed the antiferromagnetic behavior below 5.7K and the inverse magnetic susceptibility above 10K follows the Curie-Weiss law.