Search for time reversal symmetry breaking in multiband superconductors
寻找多带超导体中时间反演对称性破缺
基本信息
- 批准号:273420190
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2015
- 资助国家:德国
- 起止时间:2014-12-31 至 2021-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
In conventional metals magnetism and superconductivity are antagonistic to each other. However, there are several families of superconductors, in which superconductivity may coexist with magnetism, and only a few examples are known, when superconductivity itself induces spontaneous magnetism. Within this project, we have discovered a narrow dome of a novel s + is superconducting (SC) phase with broken time-reversal symmetry (TRSB) inside the broad s-wave SC region of the centrosymmetric multiband superconductor Ba1-xKxFe2As2 (0.7 < x < 0.85). Furthermore, our detailed specific heat study reveals that the BTRS dome appears very close to a change in the topology of the Fermi surface (Lifshitz transition). Thereby, the emergence of a novel quantum state at the topological change of the electronic system has been experimentally demonstrated. Similarly, using zero-field muon spin rotation/relaxation (ZF- µSR) measurements under uniaxial strain, we have found strong support for a two-component chiral order parameter in Sr2RuO4, which is the most known compound with a TRSB state. However, in spite of the fact that an enhanced muon spin depolarization in zero external magnetic field is an accepted empirical indicator of TRSB superconductivity, the microscopic origin of the spontaneous fields associated with a TRSB state is unknown. Within the renewal project we address three topics: 1) We target to elucidate the origin of the spontaneous magnetic fields in superconductors with a TRSB state. Using a systematic µSR study of heavy-ion and electron irradiated samples of two representative superconductors Ba1-xKxFe2As2 and Sr2RuO4 we will explore theoretical proposals that the enhanced muon spin depolarization is due to static fields at edges, domain walls, and defects, caused by the spatial variation in amplitude and phase of the TRSB order parameter. 2) In the Ba1-xKxFe2As2 system with TRSB state we found an additional unknown phase transition just above Tc on the top of the TRSB dome in the phase diagram. Combining thermodynamic, transport and local probe techniques we target to explore the nature of this unknown phase transition. 3) Also, we will continue to study the effect of the uniaxial strain on multiband superconductivity in the systems that are close to a Lifshitz transition using µSR technique. We target to confirm and investigate a TRBS superconductivity in KFe2As2 under uniaxial strain observed within this project and we will continue to investigate an effect of the uniaxial strain on TRSB phase in Sr2RuO4. 4) In addition, we will continue our search for a TRSB superconductivity close to nematic quantum critical point in the FeSe1-x(S,Te)x system. The anticipated results will shed light both on the nature of the spontaneous magnetic fields and on the pairing mechanism in superconductors with TRSB states.
在传统金属中,磁性和超导性是相互对立的。然而,有几个超导体族,其中超导性可能与磁性共存,只有少数例子是已知的,当超导性本身引起自发磁性。在本项目中,我们在中心对称多波段超导体Ba1-xKxFe2As2的宽s波超导区(0.7 < x < 0.85)内发现了一个具有破时反转对称性(TRSB)的新型s +超导(SC)相的窄圆顶。此外,我们详细的比热研究表明,BTRS圆顶非常接近费米表面拓扑结构的变化(Lifshitz跃迁)。因此,在电子系统的拓扑变化中出现了一种新的量子态,这已经被实验证明。同样,在单轴应变下使用零场μ子自旋旋转/弛缓(ZF-µSR)测量,我们发现Sr2RuO4的双组分手性有序参数得到了强有力的支持,Sr2RuO4是已知的具有TRSB态的化合物。然而,尽管在零外磁场下增强的μ子自旋去极化是公认的TRSB超导的经验指标,但与TRSB状态相关的自发场的微观起源尚不清楚。在更新项目中,我们解决了三个主题:1)我们的目标是阐明具有TRSB状态的超导体中自发磁场的起源。通过对两种具有代表性的超导体Ba1-xKxFe2As2和Sr2RuO4的重离子和电子辐照样品进行系统的µSR研究,我们将探索由TRSB序参量振幅和相位的空间变化引起的边缘、畴壁和缺陷处的静态场导致μ子自旋去极化增强的理论建议。2)在具有TRSB状态的Ba1-xKxFe2As2体系中,我们在相图中TRSB圆顶顶部的Tc上方发现了一个额外的未知相变。结合热力学、输运和局部探针技术,我们的目标是探索这种未知相变的本质。3)此外,我们将继续使用µSR技术研究单轴应变对接近Lifshitz跃迁的系统中多带超导性的影响。我们的目标是确认和研究在本项目中观察到的单轴应变下KFe2As2中的TRBS超导性,我们将继续研究单轴应变对Sr2RuO4中TRSB相的影响。4)此外,我们将继续在FeSe1-x(S,Te)x体系中寻找接近向列量子临界点的TRSB超导。预期的结果将揭示自发磁场的性质以及超导体与TRSB态的配对机制。
项目成果
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Dr. Vadim Grinenko, Ph.D.其他文献
Dr. Vadim Grinenko, Ph.D.的其他文献
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