Multigap nodeless superconductivity in the Dirac semimetal PdTe

Fengrui Shi; Weilong Qiu; Chufan Chen; Chunqiang Xu; Yan Zhang; Hao Zheng; Yuwei Zhou; Dongting Zhang; Mengwei Xie; Huiqiu Yuan; Shiyan Li; Yang Liu; Chao Cao; Xiaofeng Xu; Xin Lu

doi:10.1103/fbwl-c5x7

Multigap nodeless superconductivity in the Dirac semimetal PdTe

Fengrui Shi ¹, Weilong Qiu¹, Chufan Chen^1,2,*, Chunqiang Xu³, Yan Zhang¹, Hao Zheng ¹, Yuwei Zhou ¹, Dongting Zhang¹, Mengwei Xie¹ et al.

Huiqiu Yuan^1,4, Shiyan Li ⁵, Yang Liu ¹, Chao Cao¹, Xiaofeng Xu ⁶, and Xin Lu ^1,†

¹Center for Correlated Matter, School of Physics, Zhejiang University, Hangzhou 310058, China
²Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
³School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
⁴State Key Laboratory of Silicon Materials, Zhejiang University, Hangzhou 310058, China
⁵State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, Shanghai 200438, China
⁶School of Physics, Zhejiang University of Technology, Hangzhou 310023, China

^*Contact author: cf.chen@nus.edu.sg
^†Contact author: xinluphy@zju.edu.cn

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Phys. Rev. B 112, 224518 – Published 23 December, 2025

DOI: https://doi.org/10.1103/fbwl-c5x7

Abstract

PdTe has recently been reported to be a type-II Dirac semimetal while a bulk nodal and surface nodeless superconductivity (SC) has been claimed to coexist. In this work, we applied the point-contact spectroscopy (PCS) method to systematically study the superconducting gap in PdTe single crystals with a SC transition temperature $T_{c} = 4.3 K$ . The obtained differential conductance curves show a common deviation from a single-gap superconducting behavior and can be better fitted by a two-gap Blonder-Tinkham-Klapwijk model, suggesting the larger gap $Δ_{L}$ with $2 Δ_{L} = 3.7 k_{B} T_{c}$ and the smaller gap $Δ_{S}$ yielding $2 Δ_{S} = 1.1 - 2.2 k_{B} T_{c}$ with a weak interband scattering. The variations of conductance spectra among different contacts are proposed to be caused by the anisotropy of Fermi surface topology associated with different gaps.

Physical Review B

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Multigap nodeless superconductivity in the Dirac semimetal PdTe

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Multigap nodeless superconductivity in the Dirac semimetal PdTe

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