Electrical conductivity in helical and conical magnetic states

TL;DR

This paper theoretically investigates how electrical conductivity varies in a one-dimensional helimagnet as its spin texture transitions from helimagnetic to conical magnetic and ferromagnetic states under an increasing magnetic field, revealing dependence on electron filling and spin-charge coupling.

Contribution

It provides a detailed theoretical analysis of conductivity changes across different magnetic states in a one-dimensional helimagnet, highlighting nonlinear responses and magnetoresistance behavior.

Findings

Conductivity depends on electron filling and spin-charge coupling at zero field.

Conical magnetic state shows nonlinear conductivity response to magnetic field.

Magnetoresistance can be negative or positive depending on parameters.

Abstract

We theoretically study the electrical conductivity in a one-dimensional helimagnet whose spin texture changes from helimagnetic to conical magnetic, and to forced ferromagnetic state while increasing the magnetic field along the helical axis. We find that the conductivity in the helimagnetic state at zero field depends on the electron filling and the coefficient of the spin-charge coupling. We also find that the conductivity in the conical magnetic state changes nonlinearly to the applied field, and the magnetoresistance becomes negative and positive depending on the model parameters.