Fermi surface evolution through a heavy fermion superconductor-to-antiferromagnet transition: de Haas-van Alphen effect in Cd-substituted CeCoIn${}_5$

Abstract

We report the results of de-Haas-van-Alphen (dHvA) measurements in Cd doped CeCoIn${}_5$ and LaCoIn${}_5$. Cd doping is known to induce an antiferromagnetic order in the heavy fermion superconductor CeCoIn${}_5$, whose effect can be reversed with applied pressure. We find a slight but systematic change of the dHvA frequencies with Cd doping in both compounds, reflecting the chemical potential shift due to the addition of holes. The frequencies and effective masses are close to those found in the nominally pure compounds with similar changes apparent in the Ce and La compounds with Cd substitution. We observe no abrupt changes to the Fermi surface in the high field paramagnetic state for $x\sim x_c$ corresponding to the onset of antiferromagnetic ordering at H=0 in CeCo(In${}_{1-x}$Cd${}_x$)${}_5$. Our results rule out $f-$electron localization as the mechanism for the tuning of the ground state in CeCoIn${}_5$ with Cd doping.

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• Magnetic field splitting of the spin-resonance in CeCoIn5
• Multi-k magnetic structure and large anomalous Hall effect in candidate magnetic Weyl semimetal NdAlGe
• Evidence for Coexistence of Bulk Superconductivity and Itinerant Antiferromagnetism in the Heavy Fermion System CeCo(In${}_{1-x}$Cd${}_x$)${}_5$
• From Ising resonant fluctuations to static uniaxial order in antiferromagnetic and weakly superconducting CeCo(In${}_{1-x}$Hg${}_x$)${}_5$ ($x$=0.01)
• Strong suppression of superconductivity by divalent Ytterbium Kondo-holes in CeCoIn_5
• Possible Evolution of Antiferromagnetism in Zn-Doped Heavy-Fermion Superconductor CeCoIn5
• Pauli-limited superconductivity and antiferromagnetism in the heavy-fermion compound CeCo(In1-xZnx)5
• Fermi surface reconstruction and dimensional topology change in Nd-doped CeCoIn${}_5$
• Enhancement of Electronic Spin Susceptibility in Pauli Limited Unconventional Superconductors