Evolution of Paramagnetic Quasiparticle Excitations Emerged in the High-Field Superconducting Phase of CeCoIn5

Abstract

We present In NMR measurements in a novel thermodynamic phase of CeCoIn5 in high magnetic field, where exotic superconductivity coexists with the incommensurate spin-density wave order. We show that the NMR spectra in this phase provide direct evidence for the emergence of the spatially distributed normal quasiparticle regions. The quantitative analysis for the field evolution of the paramagnetic magnetization and newly-emerged low-energy quasiparticle density of states is consistent with the nodal plane formation, which is characterized by an order parameter in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. The NMR spectra also suggest that the spatially uniform spin-density wave is induced in the FFLO phase.

4 pages, 4 figures, accepted for publication in Phys. Rev. Lett

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• Fulde-Ferrell-Larkin-Ovchinnikov state in a perpendicular field of quasi two-dimensional CeCoIn5
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• Anisotropic effect of Cd and Hg doping on Pauli limited superconductor CeCoIn${}_5$
• Exploring the fragile antiferromagnetic superconducting phase in CeCoIn5
• Vortex tilt modulus in Fulde-Ferrell-Larkin-Ovchinnikov state
• Coupled SDW and Superconducting Order in FFLO State of CeCoIn${}_5$
• High field superconducting phase diagrams including Fulde-Ferrell-Larkin-Ovchinnikov vortex states

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