2003/07/31 by B. E. Light, Brian Light, Ravhi S. Kumar +3
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.69.024419
8 pages, 9 figures
arxiv created 2003/11/07 · openalex publication_date 2004/01/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In heavy fermion materials superconductivity tends to appear when long-range magnetic order is suppressed by chemical doping or applying pressure. Here we report heat capacity measurements on diluted alloys of the heavy fermion superconductor CeRhIn5. Heat capacity measurements have been performed on CeRh_1\ensuremath-yIryIn5 (y<~0.10) and Ce_1\ensuremath-xLaxRhIn5 (x<~0.50) in applied fields up to 90 kOe to study the effect of doping and magnetic field on the magnetic ground state. The magnetic phase diagram of CeRh0.9Ir0.1In5 is consistent with the magnetic structure of CeRhIn5 being unchanged by Ir doping. Doping of Ir in small concentrations is shown to slightly increase the antiferromagnetic transition temperature TN (TN=3.8K in the undoped sample). La doping which causes disorder on the Ce sublattice is shown to lower TN with no long-range order observed above 0.34 K for Ce0.50La0.50RhIn5. Measurements on Ce0.50La0.50RhIn5 show a coexistence of short-range magnetic order and non-Fermi-liquid behavior. This dual nature of the Ce 4f electrons is very similar to the observed results on CeRhIn5 when long-range magnetic order is suppressed at high pressure.