Determination of the Exact Symmetry of the Pairing State in Sr2RuO4

Sr2RuO4 中配对态精确对称性的测定

• 批准号: 9974327
• 负责人: Ying Liu
• 金额: $ 33.08万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-15 至 2003-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9974327&HistoricalAwards=false
• 关键词: Determination; Exact; Symmetry; Pairing; State

9974327LiuExperimental evidence for an unconventional (e.g. an odd parity (spin-triplet or p-wave)) pairing state in Sr2RuO4 has been growing. Such a system is the only known layered perovskite superconductor (Tc = 1.3 - 1.5K) that does not contain copper. This GOALI program brings together researchers from Penn State, IBM, JPL, and Kyoto University to carry out definitive experimental work that will address some key issues on this exciting new material. The main thrust is to determine the parity (even or odd) of the pairing state in Sr2RuO4 through phase-sensitive experiments on single-crystal-based structures using a scanning SQUID probe. In/Sr2RuO4 (or Pb/Sr2RuO4) junctions will be studied to further our understanding of Josephson coupling between a conventional s-wave and an unconventional superconductor. Au/Sr2RuO4 (or Ag/Sr2RuO4) metallic contacts will be used to search for novel surface-bound states associated with the Andreev process. Tunneling measurements on superconducting single crystals of Sr2RuO4 which are aimed at the understanding of the mechanism of superconductivity in this material will be continued to determine the energy gap of Sr2RuO4. In carrying out this work, scientists at Penn State, IBM, and JPL will be able to exchange ideas in a collaborative environment and be actively involved in the training of graduate students at all stages. Students in turn will have the opportunity to gain first hand experience working in very different settings including academic, industrial, and NASA research laboratories. This environment will provide them with a broader perspective when planning their future careers.%%%Recently Sr2RuO4, the only known layered perovskite superconductor (Tc = 1.3 - 1.5K) that does not contain copper, has attracted much attention in the superconductivity research community. In particular, experimental evidence for an unconventional, likely odd-parity (spin-triplet or p-wave) pairing state found in Sr2RuO4 has generated much excitement on this new superconducting material. The goals of this GOALI program are to determine the exact symmetry of the superconducting pairing state in Sr2RuO4 through phase sensitive and tunneling experiments and to study the Josephson coupling between an unconventional and a conventional s-wave superconductor. In carrying out these research activities, a productive, long-term partnership between Penn State, IBM, and JPL will be established to train students for our future generation of scientists and engineers. Students in turn will have the opportunity to gain first hand experience working in very different settings including academic, industrial, and NASA research laboratories. Such an environment will provide them with a broader perspective when planning their future careers. This GOALI project is supported jointly by the Division of Materials Research (Condensed Matter Physics Program) and the Directorate for Mathematical and Physical Sciences Office of Multidisciplinary Activities (MPS/OMA).***

SR2RUO4中的9974327 liuexpermentimal证据证明了非常规（例如奇怪的奇偶校验（自旋三键或p波））配对状态。这样的系统是唯一已知的不包含铜的层状钙钛矿超导体（TC = 1.3-1.5K）。该守门员计划汇集了宾夕法尼亚州立大学，IBM，JPL和京都大学的研究人员，以进行确定的实验性工作，这些工作将解决这种令人兴奋的新材料的一些关键问题。 主要的推力是使用扫描鱿鱼探针通过相敏感实验来确定SR2RUO4中配对状态的均衡（甚至或奇数）。将研究/sr2RUO4（或pb/sr2RUO4）连接，以进一步了解我们对常规S波和非常规超导体之间约瑟夫森耦合的理解。 AU/SR2RUO4（或AG/SR2RUO4）金属接触将用于搜索与Andreev工艺相关的新型表面结合状态。 SR2RUO4超导单晶的隧道测量将继续确定SR2RUO4的能量差距。在开展这项工作时，宾夕法尼亚州立大学，IBM和JPL的科学家将能够在协作环境中交换想法，并在各个阶段积极参与研究生的培训。 反过来，学生将有机会获得在包括学术，工业和NASA研究实验室在内的非常不同的环境中工作的第一手经验。在计划其未来职业时，这种环境将为他们提供更广泛的视角。最近SR2RUO4是唯一已知的分层钙钛矿超导体（TC = 1.3-1.5K）不含铜，在超导性研究社区中引起了很多关注。 特别是，在SR2RUO4中发现的非常规，可能的奇数（自旋三个或P波）配对状态的实验证据对这种新的超导材料产生了极大的兴奋。 该目标计划的目标是通过相敏感和隧道实验确定SR2RUO4中超导配对状态的确切对称性，并研究非常规和常规S波超导体之间的Josephson耦合。 在开展这些研究活动时，将建立宾夕法尼亚州立大学，IBM和JPL之间的富有成效的长期合作伙伴关系，以培训学生为我们的未来科学家和工程师培训。反过来，学生将有机会获得在包括学术，工业和NASA研究实验室在内的非常不同的环境中工作的第一手经验。在计划未来的职业时，这种环境将为他们提供更广泛的观点。该目标项目得到了材料研究部（冷凝物理学计划）和数学和物理科学局多学科活动（MPS/OMA）的共同支持。***