2004/05/31 by N. A. Frederick, T. A. Sayles, M. B. Maple · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.71.064508
published as PRB v. 71, 064508 (2005) · 16 pages, 5 figures, submitted to Physical Review B. v2: text added and figures modified
arxiv created 2004/10/16 · openalex publication_date 2005/02/17 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Specific heat C(T) measurements were made on single crystals of the superconducting filled skutterudite series Pr(Os_1\ensuremath-xRux)4Sb12 down to 0.6\phantom\rule0.3em0exK. Crystalline electric field fits in the normal state produced parameters which were in agreement with previous measurements. Bulk superconductivity was observed for all values of the Ru concentration x with transition temperatures consistent with previous experiments, confirming a minimum in Tc at x=0.6. The C(T) data below Tc appear to be more consistent with power-law behavior for x=0 (PrOs4Sb12), and with exponential behavior for 0.05\ensuremath\leqslantx\ensuremath\leqslant0.2. An enhanced electronic specific heat coefficient \ensuremathγ was observed for x\ensuremath\leqslant0.4, further supporting x\ensuremath≃0.6 as a critical concentration where the physical properties abruptly change. Significant enhancement of \ensuremathΔC∕Tc above the weak-coupling value was observed only for x=0 and 0.05.