Heat-capacity, magnetic-susceptibility, resistivity, and alloying experiments indicate that longrange magnetic order and superconductivity coexist belo~-1 K in a well-ordered, homogeneous sample of ErPd2Sn. The sample enters the superconducting state at T, =1.17 K follow&ed by magnetic order at T~--1.00 K. The superconducting state is retained to 40 mK, the lowest temperature attained.
The results of low-temperature specific-heat experiments on eleven superconducting compounds belonging to the ternary system R5 T4X~o (R = Sc, Y, and Lu; T= Co, Rh, Ir, and Os; X=Si and Ge) are presented.Analysis of the data yields relatively high Debye temperatures for the silicides (300 -600 K), as we11 as large values for AC/yT, (2.8 -4.9) and the electron-phonon interaction A. (0.60 -0.75) for the high-T, compounds ScqRh4Si~o, Sc5Ir4Si&0, and Y&Os4Gelo, indicating that these are strong-coupled superconductors.The analysis also indicates that a large contribution of the anharmonic term to the total specific heat in the normal state is present in the low-T, compounds. It is apparent that the phonon spectra of these Sc&Co4Si&0-type materials are quite complex.
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