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APS -APS March Meeting 2017 - Event - Emergent Phases in Heavy Fermions: a Magnetic Substitution Study

机译:APS -APS 2017年3月会议-活动-重费米子的新兴阶段:磁性替代研究

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Unconventional superconductivity frequently is found as an antiferromagnetic transition is tuned by chemical substitution or applied pressure toward a zero-temperature phase transition, a magnetic quantum-critical point. Different classes of unconventional superconductors (e.g. heavy-fermions, cuprates, and Fe-based) display a collective magnetic excitation in their superconducting state, and a universal relationship exists between the energy of this spin resonance mode and the superconducting gap. In this talk, I will focus on the heavy-fermion family of unconventional superconductors Ce$T$In$_{5}$ ($T =$ Co, Rh). I will show evidence for an emergent spin-density wave phase below the superconducting dome in pressurized CeRhIn$_{5}$ containing small amounts of magnetic substitution in the Ce site. This phase can be understood as the condensation of the spin resonance mode, providing a universal scenario for these materials.
机译:由于通过化学替代或施加压力朝着零温度相变(磁性量子临界点)调整反铁磁跃迁,经常发现非常规超导性。不同种类的非常规超导体(例如重费米子,铜酸盐和铁基)在其超导状态下显示出集体的磁激发,并且这种自旋共振模式的能量与超导间隙之间存在普遍关系。在本次演讲中,我将重点介绍非常规超导体的重费米子系Ce $ T $ In $ _ {5} $($ T = $ Co,Rh)。我将证明在加压的CeRhIn $ _ {5} $中超导圆顶下方出现一个自旋密度波相的证据,其中Ce部位含有少量的磁取代。该阶段可以理解为自旋共振模式的压缩,为这些材料提供了通用的方案。

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