The double superconducting transition in PrOs4Sb12, first observed in specific heat C(T) measurements on single crystal samples, was studied by means of specific heat measurements on PrOs4Sb12 crystals that had been subjected to applied magnetic fields, substitution of up to 4 Ru for Os, and annealing. The double superconducting transitions of a batch of single crystals were measured before and after annealing for 5 days at 500°C, to remove strains and promote homogeniety, with no observed change. Measurements of C(T) near Tc for PrOs4Sb12 in several magnetic fields are also presented, detailing the evolution of the double transition up to 1 T. Samples of Pr(Os1-x Rux)Sb12 with 0.01 ≤ x ≤ 0.04 also appear to display a double superconducting transition in specific heat. In addition, samples with the smallest Ru concentration measured (x = 0.01) may even display a more isotropic type of superconductivity than pure PrOs4Sb12 (x = 0).
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Frederick, N.A., Sayles, T.A., Kim, S.K. et al. Investigation of the Double Superconducting Transition and Low-Temperature Specific Heat of Pr(Os1-xRux)4Sb12 . J Low Temp Phys 147, 321–333 (2007). https://doi.org/10.1007/s10909-007-9316-y
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DOI: https://doi.org/10.1007/s10909-007-9316-y