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論文

Spontaneous magnetic field and disorder effects in BaPtAs$$_{1-x}$$Sb$$_x$$ with a honeycomb network

足立 匡*; Ogawa, Taiki*; 小宮山 陽太*; 須村 拓也*; Saito-Tsuboi, Yuki*; Takeuchi, Takaaki*; Mano, Kohei*; Manabe, Kaoru*; 川端 幸樹*; 今津 毅士*; et al.

Physical Review B, 111(10), p.L100508_1 - L100508_6, 2025/03

 被引用回数:0 パーセンタイル:0.00(Materials Science, Multidisciplinary)

Chiral superconductivity exhibits the formation of novel electron pairs that breaks the time-reversal symmetry and has been actively studied in various quantum materials in recent years. However, despite its potential to provide definitive information, effects of disorder in the crystal structure on the chiral superconductivity has not yet been clarified, and therefore the investigation using a solid-solution system is desirable. We report muon-spin-relaxation ($$mu$$SR) results of layered pnictide BaPtAs$$_{1-x}$$Sb$$_x$$ with a honeycomb network composed of Pt and (As, Sb). We observed an increase of the zero-field $$mu$$SR rate in the superconducting (SC) state at the Sb end of $$x=1.0$$, suggesting the occurrence of a spontaneous magnetic field due to the time-reversal symmetry breaking in the SC state. On the other hand, a spontaneous magnetic field was almost and completely suppressed for the As-Sb mixed samples of $$x=0.9$$ and 0.2, respectively, suggesting that the time-reversal symmetry-breaking SC state in $$x=1.0$$ is sensitive to disorder. The magnetic penetration depth estimated from transverse-field $$mu$$SR measurements at $$x=1.0$$ and 0.2 behaved like weak-coupling $$s$$-wave superconductivity. These seemingly incompatible zero-field and transverse-field $$mu$$SR results of BaPtAs$$_{1-x}$$Sb$$_x$$ with $$x=1.0$$ could be understood in terms of chiral $$d$$-wave superconductivity with point nodes on the three-dimensional Fermi surface.

報告書

有用金属捕集材実海域試験海上装置の製作と設置

長谷川 伸; 瀬古 典明; 田畑 幸吉*; 玉田 正男; 片貝 秋雄; 笠井 昇; 渡邊 勉; 川端 幸哉*; 縄田 孝高; 須郷 高信

JAERI-Tech 2001-020, 126 Pages, 2001/03

JAERI-Tech-2001-020.pdf:18.44MB

放射線グラフト重合法を利用し、不織布へアミドキシム基を導入した繊維状の溶融金属捕集材を開発した。この捕集材を用い、有用金属の捕集性能を実海域にて評価するため、実海域試験装置の設計・製作を進め、平成11年9月末に設置を完了した。今回、これら試験装置の海上設備の設計,製作,設置について報告する。

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