The universal relation between thermopower and magnetic susceptibility for a charge ordered manganite: Bi_1−xSr_xMnO₃(0.5≤x≤0.8)

Abstract

The relation between the thermoelectric power (S) and magnetic susceptibility (χ) for Bi1−xSrxMnO3 (0.5≤x≤0.8) has been established empirically. A simple linear equation for the relation between the two transport coefficients is deduced from the experimental data. From this relation, we extract the Peltier heat and S for this material. They are composed of two terms: one has a magnetic origin and the other originates from the configuration entropy. The universality of this relation is found by applying the relation to other magnetically interacting systems including colossal magnetoresistance materials and high TC cuprate.

Study of coexisting phases in Bi doped La0.67Sr0.33MnO3

“…The T N is found to decrease with increase of Bi doping for x t 0.3. The magnetic states of Bi3, Bi4 and Bi5 samples could be assigned to antiferromagnetic states based on other reports of Bi doped manganites [16,17]. Nevertheless, we have not observed transitions related to charge ordering state in M-T data of Bi3, Bi4 and Bi5 samples with applied field of 1 T. The charge ordered transitions in Bi3, Bi4 and Bi5 samples could possibly be above 390 K [24,29].…”

“…The charge ordering occurs in Bi 0.67 Sr 0.33 MnO 3 at above room temperature [15]. The mechanism of charge ordering is possibly related with the highly polarized 6s 2 lone pair of Bi 3+ ions in Bi 1-x Sr x MnO 3 [15,16]. Conceivably, the doping of Bi at La site in show metamagnetic transitions and coexisting FM and CO/AFM phases [13,14].…”

Electron spin resonance and resistivity studies of charge-ordered Bi(1−x)SrxMnO3

“…A relation between TEP and magnetic susceptibility is also established in ref. [26]. Rebello and Mahendiran [27] have reported pulsed as well as direct current/voltage induced electro resistance in Bi 0.8 Sr 0.2 MnO 3 at room temperature.…”