Ising superconductivity in bulk materials

Low-dimensional materials can display exceptional characteristics that diverge significantly from their larger-scale counterparts. For example, a single layer of NbSe₂ demonstrates Ising superconductivity, with its in-plane upper critical field surpassing the Pauli limit, a phenomenon absent in the bulk NbSe₂. However, it's worth noting that low-dimensional materials often suffer from instability and limited practicality in real-world applications. Through a series of experiments utilizing various techniques, we have discovered that bulk layered heterostructures composed of NbSe₂ mono- and bilayers sandwiched in-between spacer monolayers exhibit a two-dimensional band structure akin to a heavily doped NbSe₂ monolayer [1]. Notably, their in-plane upper critical fields exceed the Pauli limit by a factor of up to ten [2]. By combining first-principles calculations with experimental evidence, we have successfully derived precise band structure parameters, including the values for reduced interlayer coupling and significant spin-orbit splitting [3]. This quantitative analysis has provided us with insight into the fundamental underpinnings of Ising spin-orbit coupling in bulk superconductors.

*This work was supported by the projects APVV-20-0425, VEGA 2/0058/20, EMP-H2020 Project No. 824109, COST action CA21144 (SUPERQUMAP), EU ERDF (European regional development fund) Grant No. VA SR ITMS2014+ 313011W856.

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Bulletin of the American Physical Society

2024 APS March Meeting

Monday–Friday, March 4–8, 2024; Minneapolis & Virtual

Session S15: Superconductivity in One and Two Dimensions I

Abstract: S15.00009 : Ising superconductivity in bulk materials*

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