Possible spin transport in NbSe₃ nanowires

Spintronics, an expanding field, has been extensively explored, yielding novel physical concepts and practical applications. While spin transport in metals and semiconductors via injection experiments has been well-studied, broken-symmetry states, such as superconductivity and charge density wave (CDW) states, remain largely under-investigated. We present a spin-injection experiment using a ferromagnetic metal into a single-crystalline NbSe₃ nanowire, which undergoes CDW transitions at T ~140 K and ~ 60 K. Local measurements revealed considerably larger resistivity fluctuations than normal metals, obscuring the expected magnetic hysteresis of the ferromagnetic metal. This masking effect is ascribed to the fluctuating CDW dynamics induced by the applied transport current. Conversely, non-local measurements exhibited a spin-valve-like hysteretic response. Given NbSe₃'s persistent small Fermi surface after the CDW transition, the observed spin signals are attributed to the transport of normal electrons within the NbSe₃.