Beyond the Traditional Framework of Unconventional Superconductivity in Sr2RuO4

超越 Sr2RuO4 非常规超导的传统框架

• 批准号: 22H01168
• 负责人: 前野 悦輝
• 金额: $ 11.15万
• 依托单位: Toyota Physical and Chemical Research Institute
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22H01168/
• 关键词: ルテニウム酸化物; 非従来型超伝導; Sr2RuO4; カー効果; 核磁気共鳴

層状ルテニウム酸化物Sr2RuO4の超伝導が、これまでの分類での「非従来型」を超える枠組みである、「異なる原子軌道間の電子対形成」による可能性を判定・検証するための研究を進めた。●１.リフシッツ転移に伴う超伝導状態の変化：一軸性圧力を印加し、リフシッツ転移に対応する超伝導転移温度の増大と減少を観測した。超伝導対称性の決定的な情報を引き出すために、上部臨界磁場の面内異方性の変化を磁化率の測定から詳しく調べ始めた。●２．時間反転対称性破れ（TRSB）による超伝導2段転移の検証: ミュオンスピン回転の実験を新たに[110]一軸圧印加でも行い、2段転移を観測して論文発表した。2段転移をミュオン以外の手段で検証するため、NMR磁気緩和率1/T1の温度変化から、超伝導ギャップ構造の変化を敏感に検出する実験の準備を進めた。また、TRSBを直接検出する磁気光学カー効果（MOKE）の測定について、カリフォルニア大学アーバイン校(UCI)のグループにSr2RuO4とRu金属の共晶試料を送って共同研究を進めた。なお、京都大学でも低温までのKerr効果測定装置が稼働するようになり、一軸圧実験に取り組む準備ができた。さらに、準粒子トンネル効果により、TRSB相でのみ発生するゼロバイアス・コンダクタンスピークを柏谷（研究協力者）らと調べる実験準備を進めた。●３.NMRによる超伝導状態の判別： NMRナイトシフトから、新たな枠組みのスピン三重項・軌道間一重項の「擬スピン一重項」と、従来の「スピン一重項」d波との実験的判別に向けて、常圧でのNMRナイトシフトのデータ収集を進めた。これに関連して、上部臨界磁場付近でナイトシフトが分裂することを観測し、「スメクティック液晶のような空間並進対称性を破った超伝導」であるFFLO状態を発見して執筆を進めていた論文が、2022年4月にScienceに掲載された。

The possibility of the formation of carbon dioxide in the interchannel of iron atoms is determined by the possibility to determine the possibility of the formation of thin metal ions, the possibility of the formation of thin films, the possibility of the formation of thin films, the possibility of the formation of carbon dioxide, the possibility of the formation of carbon dioxide, the possibility of the formation of carbon dioxide, the possibility of the formation of carbon dioxide, the possibility of the formation of carbon dioxide, the possibility of the formation of carbon dioxide, the possibility of determining the possibility of the formation of carbon dioxide, the possibility of determining the possibility of the formation of carbon dioxide, the possibility of determining the possibility of the formation of carbon dioxide, the possibility of determining the possibility of the formation of carbon dioxide, the possibility of determining the possibility of the formation of carbon dioxide in the air. 1. This is accompanied by a change in the state of the state: one is the force of the Inca, the other is the movement of the temperature, the temperature of the shift, the temperature of the temperature, the temperature. The situation of the super-guiding symmetry decision leads to the determination of the magnetic susceptibility in the plane of the upper interface magnetic field. 2. Time Anti-Symmetry Disorder (TRSB) lead 2-stage transfer message: do not send a message back to the new version [110] one session of the Inca document, two-paragraph transfer table. In the second section, the temperature response of NMR magnetic field and the temperature of 1/T1 are measured by means of temperature measurement, and the system is sensitive. The eutectic materials of the Sr2RuO4 Ru metal eutectic materials are sent directly from the magnetic optical equipment (MOKE), the measurement results (MOKE), the eutectic materials of the university (UCI), the Sr2RuO4 metal eutectic materials. The equipment for measuring the low temperature temperature of Kyoto University, the equipment for measuring the results of Kerr, the equipment for measuring the results of low temperature monitoring in Kyoto University and the equipment for measuring the results of low temperature testing in Kyoto University and Kyoto University. The preparation of particles, the preparation of the particles, the particles, the particles. The identification of 3.NMR signal overload status: the identification of one item in the triple channel, one item in one channel, and one item in the triple channel in the new system group: the identification of one item in the triple channel, one item in the 3.NMR system, and one item in the track. the identification of a lot of data is improved to a higher level of data collection in the NMR network. The temperature field, the upper boundary magnetic field, and the upper boundary magnetic field are close to the temperature, the liquid crystal temperature, the space and the performance of the superconductor. The FFLO status report shows that the operator is in progress, and in April 2022, the Science is in progress.

项目成果

サレルノ大学(イタリア)

萨莱诺大学（意大利）