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KAKEN_15K17708seika.pdf
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スピン3重項カイラルp波超伝導中の特異な磁束量子渦の研究
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| Kana |
スピン 3ジュウコウ カイラル pハ チョウデンドウチュウ ノ トクイナ ジソク リョウシウズ ノ ケンキュウ
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Supin 3juko kairaru pha chodendochu no tokuina jisoku ryoshiuzu no kenkyu
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Study of quantum vortex states in spin-triplet chiral p-wave superconductor
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永合, 祐輔
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ナゴウ, ユウスケ
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Nago, Yusuke
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慶應義塾大学・理工学部・助教
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Research team head
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科研費研究者番号 : 50623435
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佐久間, 大輔
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サクマ, ダイスケ
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Sakuma, Daisuke
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篠崎, 智也
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シノザキ, トモヤ
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Shinozaki, Tomoya
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佐藤, 太一
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サトウ, タイチ
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Sato, Taichi
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2017
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科学研究費補助金研究成果報告書
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2016
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本研究では, Sr2RuO4(SRO)におけるスピン3重項カイラルp波超伝導性に起因した特異な磁束渦状態を解明するため, マイクロSQUIDとSRO微小片を用いた磁化測定デバイスを作製し, 以下の実験結果を得た。1. カイラル超伝導性の影響を示唆するような2種類の異なる磁束渦誘起信号を観測。2. 面内磁場印加下で磁化測定を行い, 半整数磁束渦の可能性を示唆する信号を観測。3. SRO-Ru共晶微小片における磁化測定から, Ru超伝導転移に伴う誘起磁束分布の変化を観測した。しかし, s波-カイラルp波超伝導位相競合に伴う磁束渦自発生成は観測されなかった。
We developed magnetization measurement devices composed of micro dc-SQUIDs and Sr2RuO4(SRO) microplates for clarification of novel quantum vortex states attributable to spin-triplet chiral p-wave superconductivity, and obtained the experimental results as follows. 1.Two distinct signals of the vortices implying influence of chiral superconductivity were obtained. 2. In the magnetization measurements under the in-plane magnetic field, the vortex signal implying a half-quantum vortex was detected. 3. In the magnetization measurements of SRO-Ru eutectic microplates, spatial distribution change of induced magnetic flux due to the superconducting transition of Ru was observed. However, spontaneous nucleation of vortex attributable to the phase competition between s-wave and chiral p-wave superconductivities was not observed.
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研究種目 : 若手研究(B)
研究期間 : 2015～2016
課題番号 : 15K17708
研究分野 : 低温物性
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