发表机构
University of Florida; University of South Carolina（佛罗里达大学; 南卡罗来纳大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过低温软点接触谱学发现PdTe存在两个超导能标，其磁场演化对应不同特征场，揭示了具有不同磁场鲁棒性的超导响应的场分辨层级结构。
AI 中文摘要
解析多个超导能标在磁场下的演化，对于区分多带、各向异性及表面敏感的超导响应至关重要。本研究在密封的³He浸没环境中，利用低温软点接触谱学研究PdTe的超导态，所得安德烈夫反射谱显示在0.5和1.1 meV附近存在两个特征超导能标，无法用单带BTK模型充分描述。两个能标随温度升高向同一超导转变温度Tc逐渐被抑制，而它们的磁场演化则显示出4.5和7.5 kG附近的两个不同特征场：较低的能标对应零电阻超导态的消失，较高能标的光谱响应则持续到大得多的磁场。独立的磁场依赖能隙分析得到的抑制尺度与零偏电导识别的结果一致。这些结果揭示了PdTe中超导能标的场分辨层级结构，表明其超导响应具有不同的磁场鲁棒性。
英文摘要
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.
