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論文

Maki parameter and upper critical field of the heavy-fermion superconductor UBe $_{13}$

清水悠晴*; 池田陽一*; 若林琢巳*; 芳賀芳範; 天谷健一*; 日高宏之*; 柳澤達也*; 網塚浩*

Journal of the Physical Society of Japan, 80(9), p.093701_1 - 093701_4, 2011/09

https://doi.org/10.1143/JPSJ.80.093701

被引用回数：8 パーセンタイル：50.77(Physics, Multidisciplinary)

Low-temperature specific heat measurements under magnetic field were performed on a single crystal UBe $_{13}$ . The specific heat shows a behavior below 0.7 $_{rm c}$ , where $_{rm c}$ is the superconducting transition temperature, suggesting the existence of point nodes in the superconducting gap. Together with the isotropic behavior of the upper critical magnetic field, the symmetry of the Cooper paring is discussed.

論文

Specific heat and magnetization studies of the superconducting mixed state of UBe $_{13}$

清水悠晴*; 池田陽一*; 若林琢巳*; 天谷健一*; 芳賀芳範; 日高宏之*; 柳澤達也*; 網塚浩*

Journal of the Physical Society of Japan, 80(Suppl.A), p.SA100_1 - SA100_3, 2011/07

https://doi.org/10.1143/JPSJS.80SA.SA100

被引用回数：1 パーセンタイル：11.35(Physics, Multidisciplinary)

Low-temperature specific heat and static dc magnetization measurements have been performed in the superconducting state of the heavy-fermion compound UBe $_{13}$ . The superconducting phase diagram was obtained from these measurements. We obtained Ginzburg-Landau parameter as a function of temperature and showed that a paramagnetic effect is present down to 0.5 K.

論文

Magnetization in the superconducting mixed state of the heavy-fermion compound UBe $_{13}$

清水悠晴*; 池田陽一*; 若林琢巳*; 天谷健一*; 芳賀芳範; 日高宏之*; 柳澤達也*; 網塚浩*

Journal of Physics; Conference Series, 273, p.012084_1 - 012084_4, 2011/02

https://doi.org/10.1088/1742-6596/273/1/012084

被引用回数：3 パーセンタイル：62.76(Physics, Condensed Matter)

Static dc magnetization measurements in the superconducting mixed state of a single crystal UBe $_{13}$ were performed by means of a capacitance Faraday-force method down to 0.24 K. Below the upper critical field $B_{c2}$ , not only a peak effect but also an additional broad anomaly have been observed in magnetization curves. We report superconducting phase diagram of UBe $_{13}$ obtained by our magnetization measurements, including these anomalies.

口頭

重水炉と冷中性子を用いたLLFPの新しい核変換法の研究,3; 冷中性子生成装置の設計検討

舘義昭; 高木直行*; 飯田拓海*; 若林利男*

no journal, ,

使用済燃料に含まれる長寿命核分裂生成物(LLFP)であるSe-79, Zr-93, Pd-107及びCs-135はいずれも中性子吸収断面積が小さく、原子炉の中性子による核変換が困難であるとされてきていた。しかしながら、これらの核種においても中性子エネルギーが低くなるほど吸収断面積が増大し、核変換効率の向上が期待できる。そこで、軽水炉よりも炉内温度が低い重水炉の炉内に極低温領域を創生し、冷中性子によりLLFPを効果的に核変換させるため、CANDU炉を想定した冷中性子生成装置について検討した。