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

References in corpus (3)

• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Enhancing the Superconducting Transition Temperature due to Strong-Coupling Effect under Antiferromagnetic Spin Fluctuations in CeRh1-xIrxIn5 : 115In-NQR Study
• New Magnetic State in Incommensurate Magnetic Phase of Heavy-Fermion Superconductor CeRh0.6Co0.4In5

Cited by in corpus (5)

• The quantum critical point in CeRhIn_5: a resistivity study
• Fermi Surface Reconstruction in CeRh${}_{1-x}$Co${}_x$In${}_5$
• Strong Coupling between Antiferromagnetic and Superconducting Order Parameters in CeRhIn${}_5$ Studied by In-NQR Spectroscopy
• Change of Antiferromagnetic Structure near a Quantum Critical Point in CeRh1-xCoxIn5
• Fermi-Surface Reconstruction in the Periodic Anderson Model