Abstract
We investigate the anisotropic spin motive force in α-(BEDT-TTF)2I3, which is a multi-layered massless Dirac fermion system under pressure. Assuming the interlayer antiferromagnetic interaction and the interlayer anisotropic ferromagnetic interaction, we numerically examine the spin ordered state of the ground state using the steepest descent method. The anisotropic interaction leads to the anisotropic spin ordered state. We calculate the spin motive force produced by the anisotropic spin texture. The result quantitatively agrees with the experiment.
Highlights
An organic conductor α-(BEDT-TTF)2 I3 is a multi-layered massless Dirac fermion system, in which conduction layers of BEDT-TTF molecules and I3 anions stack alternatively
We show that anisotropic spin ordered states are realized in α-(BEDT-TTF)2 I3 because of the interlayer anisotropic interaction and anisotropic spin motive forces are produced under magnetic field
We investigate the spin ordered state of the ground state using the steepest descent method
Summary
An organic conductor α-(BEDT-TTF)2 I3 is a multi-layered massless Dirac fermion system, in which conduction layers of BEDT-TTF molecules and I3 anions stack alternatively. The spin motive force produces the voltage. We show that anisotropic spin ordered states are realized in α-(BEDT-TTF)2 I3 because of the interlayer anisotropic interaction and anisotropic spin motive forces are produced under magnetic field. For simplicity, we take a square lattice in x-z plane in this calculation and assume the magnetic field is parallel to the z-axis.
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