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In heavy fermion materials superconductivity tends to appear when long rangemagnetic order is suppressed by chemical doping or applying pressure. Here wereport heat capacity measurements on diluted alloyes of the heavy fermionsuperconductor CeRhIn_5;. Heat capacity measurements have been performed onCeRh_{1-y}Ir_{y}In_5; (y <= 0.10) and Ce_{1-x}La_{x}Rh_{1-y}Ir_{y}In_5; (x <=0.50) in applied fields up to 90 kOe to study the affect of doping and magneticfield on the magnetic ground state. The magnetic phase diagram ofCeRh_{0.9}Ir_{0.1}In_5; is consistent with the magnetic structure of CeRhIn_5;being unchanged by Ir doping. Doping of Ir in small concentrations is shown toslightly increase the antiferromagnetic transition temperature T_{N} (T_{N}=3.8K in the undoped sample). La doping which causes disorder on the Ce sublatticeis shown to lower T_{N} with no long range order observed above 0.34 K forCe_{0.50}La_{0.50}RhIn_5;. Measurements on Ce_{0.50}La_{0.50}RhIn_5; show acoexistence of short range magnetic order and non-Fermi-liquid behavior. Thisdual nature of the Ce 4f-electrons is very similar to the observed results onCeRhIn_5; when long range magnetic order is suppressed at high pressure.Comment: 8 pages, 9 figure

physical review. b, condensed matter and materials physics

Heat capacity studies of Ce and Rh site substitution in the heavy-fermion antiferromagnet<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeRhIn</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>:</mml:mo></mml:math>Short-range magnetic interactions and non-Fermi-liquid behavior

Heat capacity studies of Ce and Rh site substitution in the heavy-fermion antiferromagnetCeRhIn5:Short-range magnetic interactions and non-Fermi-liquid behavior