Precise magnetization measurements down to 500 mK using a miniature He cryostat and a closed-cycle He gas handling system installed in a SQUID magnetometer without continuous-cooling functionality

連続冷却機能のないSQUID磁化測定装置に小型Heクライオスタット及び閉サイクルHeガス操作系を導入することによって行った500mKまでの精密磁化測定

島村 一利*; 輪島 裕樹*; 牧野 隼士*; 阿部 聡*; 芳賀 芳範   ; 佐藤 由昌*; 河江 達也*; 吉田 靖雄*

Shimamura, Kazutoshi*; Wajima, Hiroki*; Makino, Hayato*; Abe, Satoshi*; Haga, Yoshinori; Sato, Yoshiaki*; Kawae, Tatsuya*; Yoshida, Yasuo*

We have conducted precise magnetization measurements down to 500 mK using a commercial magnetometer. The gas handling system contains two sorption pumps filled with granular charcoals. He gas is pressurized up to ambient pressure for liquification at 3 K and the vapor is pumped for cooling. We demonstrate the performance of the system by observing the Meissner effect of aluminum below the superconducting transition temperature.