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arXiv · 2610.12075

Field-resolved hierarchy of superconducting energy gaps in PdTe

Sangyun Lee·A. M. Donald·D. Duong·S. Huang·R. Gazizulin·C. Huan·Rongying Jin
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Abstract

Resolving how multiple superconducting energy scales evolve under magnetic field is important for distinguishing multiband, anisotropic, and surface-sensitive superconducting responses. Here, we investigate the superconducting state of PdTe using low-temperature soft point-contact spectroscopy in a sealed $^3$He immersion environment. The resulting Andreev-reflection spectra reveal two characteristic superconducting energy scales near 0.5 and 1.1 meV that are not adequately described by a single-gap BTK model. Both energy scales are progressively suppressed upon warming toward the same superconducting transition temperature $T_c$. In contrast, their magnetic-field evolution reveals two distinct characteristic fields near 4.5 and 7.5 kG. The lower scale is associated with the loss of the zero-resistance superconducting state, whereas the higher-energy spectroscopic response persists to substantially larger fields. Independent field-dependent gap analysis yields suppression scales consistent with those identified from the zero-bias conductance. These results reveal a field-resolved hierarchy of superconducting energy scales in PdTe and indicate superconducting responses with distinct magnetic-field robustness.

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Sangyun Lee, A. M. Donald, D. Duong, S. Huang, R. Gazizulin, C. Huan, Rongying Jin. 2026-10-08. Field-resolved hierarchy of superconducting energy gaps in PdTe. https://arxiv.org/abs/2610.12075

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