Field-induced coupled superconductivity and spin density wave order in the Heavy Fermion compound CeCoIn5

Abstract

The high field superconducting state in CeCoIn5 has been studied by transverse field muon spin rotation measurements with an applied field parallel to the crystallographic c-axis close to the upper critical field Hc2 = 4.97 T. At magnetic fields >= 4.8 T the muon Knight shift is enhanced and the superconducting transition changes from second order towards first order as predicted for Pauli-limited superconductors. The field and temperature dependence of the transverse muon spin relaxation rate sigma reveal paramagnetic spin fluctuations in the field regime from 2 T < H < 4.8 T. In the normal state close to Hc2 correlated spin fluctuations as described by the self consistent renormalization theory are observed. The results support the formation of a mode-coupled superconducting and antiferromagnetically ordered phase in CeCoIn5 for H directed parallel to the c-axis.

5 paes, 4 figures

References in corpus (5)

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• Fulde-Ferrell-Larkin-Ovchinnikov state in a perpendicular field of quasi two-dimensional CeCoIn5
• Observation of Spin Susceptibility Enhancement in the Possible FFLO State in CeCoIn${}_5$
• Coexistence of SDW, d-wave singlet and staggered $\pi$-triplet superconductivity
• Comment on ``Texture in the Superconducting Order Parameter of CeCoIn${}_5$ Revealed by Nuclear Magnetic Resonance''

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• Fermi surface evolution through a heavy fermion superconductor-to-antiferromagnet transition: de Haas-van Alphen effect in Cd-substituted CeCoIn${}_5$
• Strong pressure dependence of the magnetic penetration depth in single crystals of the heavy fermion superconductor CeCoIn5 studied by muon spin rotation
• Interplay of Superconductivity, Antiferromagnetism, and Pauli Depairing in CeCoIn${}_5$
• Quantum critical quasiparticle scattering within the superconducting state of CeCoIn5
• Fluctuation and Order of Antiferromagnetism induced by Paramagnetic Pair-Breaking in Superconducting Vortex Lattice
• Field-induced quantum critical point and nodal superconductivity in the heavy-fermion superconductor Ce2PdIn8
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• Muon Spin Rotation in Heavy Electron Pauli Limited Superconductors