Magnetic proximity-induced superconducting diode effect and infinite magnetoresistance in a van der Waals heterostructure
Jonginn Yun, Suhan Son, Jeacheol Shin, Giung Park, Kaixuan Zhang, Young Jae Shin, Je-Geun Park, Dohun Kim
DOI 10.1103/PhysRevResearch.5.L022064 · Physical Review Research
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Abstract
We report unidirectional charge transport in a NbSe2 noncentrosymmetric superconductor that is exchange-coupled with a CrPS4 van der Waals layered antiferromagnetic insulator. The NbSe2/CrPS4 bilayer device exhibits bias-dependent superconducting critical-current variations of up to 16%, with magnetochiral anisotropy reaching ∼105T–1A–1. Furthermore, the CrPS4/NbSe2/CrPS4 spin-valve structure exhibits the superconducting diode effect with critical-current variations of up to 40%. We also utilize the magnetic proximity effect to induce switching in the superconducting state of the spin-valve structure. Finally, it exhibits an infinite magnetoresistance ratio depending on the field sweep direction and magnetization configuration. Our result demonstrates a novel route for enhancing the nonreciprocal response in the weak external field regime (<50mT) by exploiting the magnetic proximity effect.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.51 | Pressure not reported | unknown |
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