J. Phys. Soc. Jpn. 75S (2006) pp. 174-176  |Previous Article| |Next Article|  |Table of Contents|
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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –

Thermodynamics Investigation on Pressure-induced Superconductor CeNiGe₃ by ac Calorimetry

Naoyuki Tateiwa¹, Yoshinori Haga¹, Tatsuma D. Matsuda¹, Shugo Ikeda¹, Miho Nakashima², Arumugam Thamizhavel², Rikio Settai² and Yoshichika Ōnuki^1,2

We measured the heat capacity of the pressure-induced superconductor CeNiGe₃ by the ac calorimetry under high pressure up to 2.4 GPa using a single crystal sample grown by the Bi-flux method. The heat capacity C_ac shows the λ-type anomaly at Néel temperature T_N. The pressure dependence of T_N is consistent with those determined previous studies by the resistivity measurement under high pressure. At 2.1 and 2.4 GPa, the heat capacity anomaly was observed around 0.3 K. This temperature is close to the superconducting transition temperature T_sc determined by the previous resistivity measurement. Therefore, the heat capacity anomaly may be due to the superconducting transition. The value of T_sc by the present heat capacity measurement was larger than those by the resistivity measurement. This might reflect a sample dependence.

URL: http://jpsj.ipap.jp/link?JPSJS/75S/174/
DOI: 10.1143/JPSJS.75S.174

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