2007/04/23 by S. Ohira-Kawamura, Seiko Ohira‐Kawamura, Hiroaki Shishido +12 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Antiferromagnetism #Chemistry #Condensed matter physics #Crystallography #Diffraction #Fermi surface #Iron-based superconductors research #Neutron diffraction #Order (exchange) #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Rare-earth and actinide compounds #Superconductivity #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.76.132507
RevTeX4, 4 pages, 4 eps figures; corrected a typo and a reference
arxiv created 2007/04/23 · openalex publication_date 2007/10/19 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Elastic neutron diffraction measurements were performed on the quasi-two-dimensional heavy-fermion system CeRh_1\ensuremath-xCoxIn5, ranging from an incommensurate antiferromagnet for low Co composition 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 \mathbitqI=(1∕2,1∕2,\ensuremathδ) with \ensuremathδ=0.298, while it coexists with the commensurate AFM order with \mathbitqc=(1∕2,1∕2,1∕2). This is in sharp contrast to the CeRh_1\ensuremath-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 \mathbitqI play an active role in forming the superconducting state in CeCoIn5.