鉄系超伝導体鉄セレン・鉄テルル系の機構解明と新物質探索

铁基超导体铁硒和铁碲的机理阐明及新材料的寻找

• 批准号: 10J02237
• 负责人: 水口 佳一
• 金额: $ 0.45万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10J02237/
• 关键词: 鉄系超伝導体; 結晶育成; 新物質探索; 輸送・磁気特性; 超伝導線材

鉄系超伝導体の研究を行い,特に鉄カルコゲナイド系に着目し,結晶育成,基礎物性研究,応用への向けた萌芽研究を行った.2009年に自ら発見した超伝導体FeTe1-xSxの相図完成を目指し,超伝導特性の向上と良質単結晶育成を目指した.その結果,FeTe1-xSxの超伝導特性が大気暴露酸素アニールなど,様々なポストトリートメントにより著しく改善されることを明らかにした.さらに,Sの濃度を変化させた単結晶を系統的に合成し,酸素アニールを施すことで超伝導を示す単結晶の合成に成功した.単結晶試料を用いて電気抵抗率測定,磁化測定を詳細に行うことで,磁性・超伝導相のS濃度依存性を詳細に決定した.その結果からFeTe1-xSx系の相図を完成できた.2010年の12月に,新しくKFe2Se2超伝導体が中国のグループにより発見された.KFe2Se2はもっとも単純な鉄系超伝導体であるFeSeにKをインターカレートすることでその構造が変化し超伝導特性が大きく上昇した.この物質は私自身も合成に取り組んでいた物質であり,報告直後にいち早く結晶育成に取り組み,その超伝導を再現するとともに良質な単結晶を用いた磁場中輸送測定を行い,応用への可能性を提案した.さらに,電気抵抗測定において観測される異常な振る舞い(ブロードなハンプの存在)と超伝導転移温度の相関を議論し,その後の良質単結晶育成の一つの指針となった.これらの結果は世界的に評価され,JPSJ誌およびZ.Krist.誌の2誌に鉄カルコゲナイド超伝導体に関するレビュー論文を出版した.

In the course of the study of the body, the special purpose of this paper is to study the physical properties of the target, the growth of the crystal, the study of the physical properties, and the sprouting research of the target. In 2009, we saw that the superconductor FeTe1-xSx phase completed the target, and the superconducting properties were bred into the target. According to the results of the experiment, the characteristics of the FeTe1-xSx system show that there are significant differences between the two groups, and the results show that there are significant differences between the two groups. The synthesis of the crystal system is characterized by temperature, temperature and temperature. The results show that the resistivity of the alloy is determined by the electrical impedance test, the magnetization is determined by the magnetization test, and the magnetic superalloy is determined by the S-degree dependence of the magnetic superalloy. The results show that the FeTe1-xSx system has completed the test in December 2010. In December 2010, the new KFe2Se2 system has been successfully implemented in China. KFe2Se2 is responsible for improving the performance of the system. KFe2Se2 is responsible for improving the performance of the system. KFe2Se2 does not change the performance of the system. In December 2010, KFe2Se2 is responsible for improving the performance of the system. After the report, the data acquisition system was developed into a data acquisition system, and the thermal performance test results showed that the transmission temperature was measured in the magnetic field, and the proposal for the possibility of using the device was proposed. The electrical resistance test is used to determine the frequency of the vibration dance (in the presence of the temperature sensor). After that, the temperature of the temperature shift is discussed, and the crystal of the temperature is bred into a temperature control device. The results show that the world is famous for all kinds of diseases, and JPSJ is very popular with Z.Krist. The publication of the article was published in the first place.

项目成果

Evolution of superconductivity by oxygen annealing in FeTe0.8S0.2

• DOI: 10.1209/0295-5075/90/57002
• 发表时间: 2010-06-01
• 期刊: EPL
• 影响因子: 1.8
• 作者: Mizuguchi, Y.;Deguchi, K.;Takano, Y.
• 通讯作者: Takano, Y.

Anion height dependence of Tc for the Fe-based superconductor

• DOI: 10.1088/0953-2048/23/5/054013
• 发表时间: 2010-05-01
• 期刊: SUPERCONDUCTOR SCIENCE & TECHNOLOGY
• 影响因子: 3.6
• 作者: Mizuguchi, Y.;Hara, Y.;Takano, Y.
• 通讯作者: Takano, Y.

Moisture-induced superconductivity in FeTe 0.8 S 0.2

• DOI: 10.1103/physrevb.81.214510
• 发表时间: 2009-12
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: Y. Mizuguchi;K. Deguchi;S. Tsuda;T. Yamaguchi;Y. Takano

Superconductivity in oxygen-annealed FeTe1-xSx single crystal

• DOI: 10.1063/1.3531554
• 发表时间: 2010-09
• 期刊: arXiv: Superconductivity
• 作者: Y. Mizuguchi;K. Deguchi;Y. Kawasaki;T. Ozaki;M. Nagao;S. Tsuda;T. Yamaguchi;Y. Takano

Superconducting properties of Fe chalcogenide and fabrication of the superconducting wire

Fe硫族化物的超导性能及超导线材的制备

• 发表时间: 2010
• 作者: Y.Mizuguchi;et al.;Y.Mizuguchi;Y.Mizuguchi
• 通讯作者: Y.Mizuguchi