Abstract
We studied the effect of partial substitution of Al by Pd in the non-centrosymmetric superconducting intermetallic alloy \(\hbox {Mo}_{3}\hbox {Al}_{2}\hbox {C}\). Magnetization, resistivity and specific heat measurements, as a function of temperature, were performed in the system \(\hbox {Mo}_{3}\hbox {Al}_{2-{x}}\hbox {Pd}_{x}\hbox {C}\) with x = 0.0, 0.05 and 0.10. The magnetic, electrical and thermal measurements show that the effect of substitution of Al by Pd is to lower the transition temperature to the superconducting state \(T_c\). Using the Werthamer–Helfand–Hohenberg theory, the temperature dependence of the upper critical field was analyzed. From specific heat measurements, parameters of the normal and superconductor state were estimated. The estimated values of Sommerfeld’s constant indicate that the presence of Pd in \(\hbox {Mo}_{3}\hbox {Al}_{2}\hbox {C}\) affects the Fermi surface. Power laws in \(C_e\) indicate the existence of nodes or lines of nodes in the superconducting gap; this indicates that \(\hbox {Mo}_{3}\hbox {Al}_{2-{x}}\hbox {Pd}_{x}\hbox {C}\) is not a conventional superconductor.
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Acknowledgements
The authors would like to thank R. Escamilla for the ease of use of its laboratory for the synthesis of samples, R. Escudero for facilities for performing the measurements, and also A. Bobadilla for technical assistance. O. Olicón would like to thank CONACYT, for support through the Postdoctoral Scholarship.
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Olicón, O., Castro, A.A. & Morales, F. Effect of Pd on the superconductivity in non-centrosymmetric \(\hbox {Mo}_{3}\hbox {Al}_{2-{x}}\hbox {Pd}_{x}\hbox {C}\) alloys, with x = 0.00, 0.05 and 0.10. Appl. Phys. A 128, 1006 (2022). https://doi.org/10.1007/s00339-022-06121-8
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DOI: https://doi.org/10.1007/s00339-022-06121-8