Quantum oscillations and anisotropic magnetoresistance in the quasi-two-dimensional Dirac nodal line superconductor $\mathrm{YbSb_2}$

Yuxiang Gao; Kevin Allen; Rose Albu Mustaf; Yichen Zhang; Sanu Mishra; Christopher Lane; Marta Zonno; Sergey Gorovikov; Jian-Xin Zhu; Ming Yi; Emilia Morosan

arXiv · 2510.05401

Quantum oscillations and anisotropic magnetoresistance in the quasi-two-dimensional Dirac nodal line superconductor $\mathrm{YbSb_2}$

Yuxiang Gao·Kevin Allen·Rose Albu Mustaf·Yichen Zhang·Sanu Mishra·Christopher Lane·Marta Zonno·Sergey Gorovikov·Jian-Xin Zhu·Ming Yi·Emilia Morosan

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Abstract

Recent interest in quantum materials has focused on systems exhibiting both superconductivity and non-trivial band topology as material candidates to realize topological or unconventional superconducting states. So far, superconductivity in most topological materials has been identified as type II. In this work, we present magnetotransport studies on the quasi-two-dimensional type I superconductor $\mathrm{YbSb_2}$. Combined ab initio DFT calculations and quantum oscillation measurements confirm that $\mathrm{YbSb_2}$ is a Dirac nodal line semimetal in the normal state. The complex Fermi surface morphology is evidenced by the non-monotonic angular dependence of both the quantum oscillation amplitude and the magnetoresistance. Our results establish $\mathrm{YbSb_2}$ as a candidate material platform for exploring the interplay between band topology and superconductivity.

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Yuxiang Gao, Kevin Allen, Rose Albu Mustaf, Yichen Zhang, Sanu Mishra, Christopher Lane, Marta Zonno, Sergey Gorovikov, Jian-Xin Zhu, Ming Yi, Emilia Morosan. 2025-10-06. Quantum oscillations and anisotropic magnetoresistance in the quasi-two-dimensional Dirac nodal line superconductor $\mathrm{YbSb_2}$. https://arxiv.org/abs/2510.05401

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