The low number of physical parameters for superconductivity has motivated researchers to perform bulk measurements in YRh 4 B 4 , discovered four decades ago, with superconducting transition temperature (T c ) of approximately 11 K. We performed electrical resistivity, magnetic susceptibility, and specific heat measurements to investigate the superconducting properties of the ternary borides YRh 4 B 4 with CeCo 4 B 4 -type tetragonal structure. The nearly single-phase YRh 4 B 4 had a moderately high T c of 10.6 K. The lower and upper critical fields were determined to be 1.5 and 32 kOe, respectively, by magnetic susceptibility and electrical resistivity measurements. The Ginzburg-Landau parameter κ GL was approximately 4.35, which is greater than > 1/ √ 2, implying that YRh 4 B 4 is a type-II superconductor. Because of specific heat measurements, the Debye temperature Θ D , ∆C/γT c , and 2∆ 0 /T c were determined to be 505 K, 1.56, and 3.91, respectively, where the specific heat jump at T c and the superconducting gap at 0 K are expressed by ∆C and ∆ 0 . The electrical resistivity at low temperatures showed quadratic temperature dependence, and its coefficient A was determined to be 0.004426 µΩ• cm K −2 , indicating a large density of states at Fermi energy. The electron-phonon coupling constant λ el-ph was derived to be 0.69. These results strongly suggest that YRh 4 B 4 is a conventional s-wave superconductor described by the Bardeen-Cooper-Shriefer theory, and that the moderately high-T c in YRh 4 B 4 is attributable to a high Θ D due to vibrations of boron with a light mass and a large A-value originating from the large density of states at Fermi energy. These results will facilitate microscopic investigations and provide clues to develop a novel high-T c metal superconductor.
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