Anomalous Nonreciprocal Electrical Transport on Chiral Magnetic Order

Nonreciprocal flow of conduction electrons is systematically investigated in a monoaxial chiral helimagnet CrNb3S6. We found that such directional dichroism of the electrical transport phenomena, called the electrical magnetochiral (EMC) effect, occurs in a wide range of magnetic fields and temperatures. The EMC signal turns out to be considerably enhanced below the magnetic ordering temperature, suggesting a strong influence of the chiral magnetic order on this anomalous EMC transport property. The EMC coefficients are separately evaluated in terms of crystalline and magnetic contributions in the magnetic phase diagram.