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Magnetic response in the superconducting state of $$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$ studied by $$mu$$SR

$$mu$$SRから眺めた$$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$の超伝導状態における磁気的応答

黒岩 壮吾*; 高際 實之*; 山澤 眞紀*; 富田 葉子*; 秋光 純*; 大石 一城; 幸田 章宏*; Saha, S. R.*; 門野 良典*; 髭本 亘  

Kuroiwa, Sogo*; Takagiwa, Hiroyuki*; Yamazawa, Maki*; Tomita, Yoko*; Akimitsu, Jun*; Oishi, Kazuki; Koda, Akihiro*; Saha, S. R.*; Kadono, Ryosuke*; Higemoto, Wataru

$$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$は既存の$$5H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$及び$$6H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$に比べて新しい結晶構造を有する。これらの物質はすべてAlB$$_2$$型結晶構造を有するが、既存の物質では$$c$$軸方向に5倍周期もしくは6倍周期の超格子構造をとることが報告されている。今回新たに作成された$$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$はこのような超格子構造を持たない。本物質も既存の物質と同様超伝導を示すが、上部臨界磁場$$H_{c2}$$の値は既存の2種類の超伝導体に比べて$$H_{c2}^{Hparallel a}$$及び$$H_{c2}^{Hparallel c}$$ともに非常に小さい値を示した。この新しい超伝導体の秩序変数を調べるため$$mu$$SR測定を行った結果、磁場侵入長の磁場依存性から$$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$超伝導の対称性は異方的であることを示唆した。

Magnetic field dependence of the effective penetration depth ($$lambda$$) determined by $$mu$$SR is reported for $$1H$$-Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$, a structurally new phase of Ca(Al$$_{0.5}$$Si$$_{0.5}$$)$$_2$$. The new phase has an AlB$$_2$$-type crystal structure with $$P$$3 symmetry which, in contrast to earlier reports, does not exhibit superlattice structure along the $$c$$-axis. The bulk susceptibility measurement indicates that the upper critical field is much lower than that in superstructured ones for both $$c$$- and $$a$$-axis directions. A weak anisotropy in the superconducting order parameter is suggested from the increase of $$lambda$$ with increasing external field.

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パーセンタイル:6.91

分野:Physics, Condensed Matter

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