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Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide by Qu, Tingyu; Jin, Shangjian; Hou, Fuchen; Fu, Deyi; Huang, Junye; Wei, Darryl Foo Chuan; Chang, Xiao; Watanabe, Kenji; Taniguchi, Takashi; Lin, Junhao; Adam, Shaffique; Özyilmaz, Barbaros is a scholarly article available to read on EtoBox.

What is Ferromagnetic Superconductivity in Two-dimensional Niobium Diselenide about?

The co-existence of ferromagnetism and superconductivity becomes possible through unconventional pairing in the superconducting state. Such materials are exceedingly rare in solid-state systems but are promising platforms to explore topological phases, such as Majorana bound states. Theoretical investigations date back to the late 1950s, but only a few systems have so far been experimentally identified as potential hosts. Here, we show that atomically-thin niobium diselenide (NbSe$_2$) intercalated with dilute cobalt atoms spontaneously displays ferromagnetism below the superconducting transition temperature ($T_c$). We elucidate the origin of this phase by constructing a magnetic tunnel junction that consists of cobalt and cobalt-doped niobium diselenide (Co-NbSe$_2$) as the two ferromagnetic electrodes, with an ultra-thin boron nitride as the tunnelling barrier. At a temperature well below $T_c$, the tunnelling magnetoresistance shows a bistable state, suggesting a ferromagnetic order in Co-NbSe$_2$. We propose a RKKY exchange coupling mechanism based on the spin-triplet superconducting order parameter to mediate such ferromagnetism. We further perform non-local lateral spin valv

Author

Qu, Tingyu; Jin, Shangjian; Hou, Fuchen; Fu, Deyi; Huang, Junye; Wei, Darryl Foo Chuan; Chang, Xiao; Watanabe, Kenji; Taniguchi, Takashi; Lin, Junhao; Adam, Shaffique; Özyilmaz, Barbaros

Published

2023

Language

EN