Magnetic and thermoelectric properties of three different atomic ratio of Bi/Mn in BiMn sub(2)O sub(5): DFT approach

Electronic structure and magnetic properties of the three different samples of BiMn sub(2)O sub(5), are calculated using the density functional theory (DFT). These samples have different Bi/Mn concentration. For simplicity, we suggest to call them as A, B and C. The calculated band structures show half metallic!ty for all samples, and possess 100% spin polarization at the Fermi level. The spin up/down density of states are calculated using Engel-Vosko generalized gradient approximation (EV-GGA). We have discussed the effect of Mn magnetic moment ( mu sub(B)) on the electronic and magnetic properties of the entire samples. The temperature dependent thermoelectric properties like electrical and thermal conductivity, Seebeck coefficient and power factor are also calculated, employing the Boltzmann transport theory under the BoltzTraP code. Our results indicated that these properties are strongly dependent on Bi/Mn concentration.