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Multigap superconductivity with non-trivial topology in a Dirac semimetal PdTe
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Recently, PdTe has been identified as a Dirac semimetal with potential for unconventional superconductivity based on ARPES measurements. This study presents electrical transport and magnetization measurements conducted on high-quality single crystals of PdTe. Anisotropy in the upper critical magnetic field is observed in resistivity versus temperature data measured under various applied magnetic fields for in-plane (B II ab ) and out-of-plane (B II c) orientations. The magnetic field versus temperature (H - T) phase diagram extracted from resistivity data exhibits an upward curvature akin to several multigap superconductors. Additionally, magnetization measurements reveal de Haas-Van Alphen (dHvA) oscillations in both B II ab and B II c orientations. Fourier analysis of the quantum oscillations identifies two Fermi pockets. Moreover, the Landau fan diagram for a small Fermi pocket confirms a non-trivial Berry phase {\pi}, indicative of the Dirac nature of PdTe. Based on quantum oscillation data, a plausible band diagram is constructed.
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Exploring unconventional superconductivity in PdTe via Point Contact Spectroscopy
Point-contact Andreev reflection spectra of PdTe are inconsistent with isotropic s-wave pairing and consistent with both p-wave and d-wave gap symmetries, supporting unconventional nodal superconductivity.
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