Possible Evolution of Antiferromagnetism in Zn-Doped Heavy-Fermion Superconductor CeCoIn5

Abstract

We have succeeded in growing single crystals of the heavy-fermion superconductor CeCo(In1-xZnx)5 with x<=0.07. Measurements of specific heat, electrical resistivity, dc magnetization and ac susceptibility revealed that the superconducting (SC) transition temperature Tc decreases from 2.25 K (x=0) to 1.8 K (x=0.05) by doping Zn into CeCoIn5. Furthermore, these measurements indicate a development of a new ordered phase below T_o ~ 2.2 K for x=>0.05, characterized by the reduced magnetization and electrical resistivity in the ordered phase, and the enhancement of specific heat at T_o. This phase transition can be also recognized by the shoulder-like anomaly seen at H_o ~ 55 kOe in the field variations of the magnetization at low temperatures, which is clearly distinguished from the superconducting critical fields Hc2=49 kOe for x=0.05 and 42 kOe for x=0.07. We suggest from these results that the antiferromagnetic (AFM) order is generated by doping Zn, and the interplay between the SC and AFM orders is realized in CeCo(In1-xZnx)5.

5 pages, 3 figures, to appear in J. Phys. Soc. Jpn

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• Spin resonance in the d-wave superconductor CeCoIn5
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• Pauli-limited superconductivity and antiferromagnetism in the heavy-fermion compound CeCo(In1-xZnx)5
• DFT+DMFT study of dopant effect in a heavy fermion compound CeCoIn5
• Observation of a new field-induced phase transition and its concomitant quantum critical fluctuations in CeCo(In${}_{1-x}$Zn${}_x$)${}_5$
• Superconductivity and non-Fermi-liquid behavior in the heavy-fermion compound CeCo${}_{1-x}$Ni${}_x$In${}_5$
• Anisotropic magnetic-field response of quantum critical fluctuations in Ni-doped CeCoIn5
• Magnetic Quantum Criticality inside the Superconducting State Revealed by Penetration Depth Scaling with Local $T_{\mathrm{c}}$
• Carrier-doping effect and anomalous transport properties in Ni-doped CeCoIn5 investigated by Hall resistivity measurements