Competition between unconventional superconductivity and incommensurate antiferromagnetic order in CeRh1-xCoxIn5

Abstract

Elastic neutron diffraction measurements were performed on the quasi-two dimensional heavy fermion system CeRh1-xCoxIn5, ranging from an incommensurate antiferromagnet for low x to an unconventional superconductor on the Co-rich end of the phase diagram. We found that the superconductivity competes with the incommensurate antiferromagnetic (AFM) order characterized by qI=(1/2, 1/2, delta) with delta=0.298, while it coexists with the commensurate AFM order with qc=(1/2, 1/2, 1/2). This is in sharp contrast to the CeRh1-xIrxIn5 system, where both the commensurate and incommensurate magnetic orders coexist with the superconductivity. These results reveal that particular areas on the Fermi surface nested by qI play an active role in forming the superconducting state in CeCoIn5.

RevTeX4, 4 pages, 4 eps figures; corrected a typo and a reference

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• Itinerant vs Localized Heavy-Electron Magnetism
• Strong Coupling between Antiferromagnetic and Superconducting Order Parameters in CeRhIn${}_5$ Studied by In-NQR Spectroscopy
• Antiferromagnetism and Superconductivity in CeRhIn${}_5$
• Quantitative study of the f occupation in CeMIn5 and other cerium compounds with hard x-rays
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• Change of Antiferromagnetic Structure near a Quantum Critical Point in CeRh1-xCoxIn5
• Possible Evolution of Antiferromagnetism in Zn-Doped Heavy-Fermion Superconductor CeCoIn5
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• Switching of the magnetic order in CeRhIn${}_{5-x}$Sn${}_x$ in the vicinity of its quantum critical point
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• Determination of the magnetic structure of CePt${}_2$In${}_7$ by means of neutron diffraction
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• Magnetic structure of Cd-doped CeIrIn${}_5$
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