Anisotropic effect of Cd and Hg doping on Pauli limited superconductor CeCoIn${}_5$

Abstract

We investigated the effect of Cd and Hg doping on the first order superconducting (SC) transition and the high field-low temperature SC state of CeCoIn${}_5$ by measuring the specific heat of CeCo(In${}_{1-\mathrm{x}}$Cd${}_{\mathrm{x}}$)${}_5$ with x=0.0011, 0.0022 and 0.0033 and CeCo(In${}_{1-\mathrm{x}}$Hg${}_{\mathrm{x}}$)${}_5$ with x=0.00016, 0.00032, and 0.00048 at temperatures down to 0.1 K and fields up to 14 T. Cd substitution rapidly suppresses the cross-over temperature $T_0$, where the superconducting transition changes from second to first order, to $T$=0 K with x=0.0022 for $H\parallel$ [100], while it remains roughly constant up to x=0.0033 for $H\parallel$ [001]. The associated anomaly of the proposed FFLO state in Hg-doped samples is washed out by x=0.00048, while remaining at the same temperature, indicating high sensitivity of that state to impurities. We interpret these results as supporting the non-magnetic, possibly FFLO, origin of the high field - low temperature state in CeCoIn${}_5$.

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Cited by in corpus (25)

• Superconducting phases of f-electron compounds
• Towards the identification of a quantum critical line in the (p, B) phase diagram of CeCoIn5
• Evolution of Paramagnetic Quasiparticle Excitations Emerged in the High-Field Superconducting Phase of CeCoIn5
• Antiferromagnetic ordering induced by paramagnetic depairing in unconventional superconductors
• Magnetism and superconductivity driven by identical 4$f$ states in a heavy-fermion metal
• Electronic tuning and uniform superconductivity in CeCoIn5
• Inherent spin density wave instability by vortices in superconductors with strong Pauli effects
• Influence of $s_{\pm }$ symmetry on unconventional superconductivity in pnictides above the Pauli limit -- two-band model study
• Emergent Antiferromagnetism in D-wave Superconductor with Strong Paramagnetic Pair-Breaking
• Impurity-induced broadening of the transition to a Fulde-Ferrell-Larkin-Ovchinnikov phase
• Anomalous doping effect on the superconducting state in CeCoIn${}_5$ at high magnetic fields
• Behavior of the Quantum Critical Point and the Fermi-liquid Domain in the Heavy Fermion Superconductor CeCoIn5 studied by resistivity
• Quantum criticality near the upper critical field of Ce${}_2$PdIn${}_8$
• Disordered Fulde-Ferrel-Larkin-Ovchinnikov State in d-wave Superconductors
• Pauli-limited upper critical field in dirty d-wave superconductors
• Fermi surface evolution through a heavy fermion superconductor-to-antiferromagnet transition: de Haas-van Alphen effect in Cd-substituted CeCoIn${}_5$
• Pauli-limited superconductivity and antiferromagnetism in the heavy-fermion compound CeCo(In1-xZnx)5
• Hyperfine fields and magnetic structure in the B phase of CeCoIn5
• Possible Triplet Superconducting Order in Magnetic Superconducting Phase induced by Paramagnetic Pair-Breaking
• Superconductivity and non-Fermi-liquid behavior in the heavy-fermion compound CeCo${}_{1-x}$Ni${}_x$In${}_5$
• Angular dependence of antiferromagnetic order induced by paramagnetism in d-wave superconductor
• Coupled k-space structure of $d$-wave superconducting and magnetic orders induced by paramagnetic pair-breaking effect
• Coexistence of d-wave superconductivity and antiferromagnetism induced by paramagnetic depairing
• Strong-coupling approach to antiferromagnetic ordering driven by paramagnetic pair-breaking in d-wave superconducting phase
• Roles of Antiferromagnetic Fluctuation in High Field Phase Diagram of Superconductors with Strong Paramagnetic Depairing