The Influence of Ti Doping at the Mn Site on Magnetoresistance and Thermopower Properties of Sm0.6Sr0.4MnO3

The Influence of Ti Doping at the Mn Site on Magnetoresistance and Thermopower Properties of Nd-=SUB=-0.5-=/SUB=-Ca-=SUB=-0.5-=/SUB=-MnO-=SUB=-3-=/SUB=-

“…To compare the resistivity and MR data, resistivities of all three samples are presented in a common temperature range. Parent compound N shows a significant zero-field resistivity variation at 270 K which is above the charge-ordering temperature (T CO = 235 K) of the compound [5]. As the temperature decreases, resistivity starts to rise around its Neel temperature (T N = 140 K), which may be due to the AFM orderings in the sample.…”

“…The high-purity precursors such as the oxides and carbonates of the constituent elements were thoroughly mixed under acetone medium for 9 hours; calcination of powder samples and sintering of pressed pellets were carried out at 900 and 1200 • C, respectively, for 24 hours. The detailed discussion on the preparation method and the structural analysis were already reported [5,8]. Resistance as a function of temperature was measured using Quantum design PPMS instrument, from which the corresponding resistivity is calculated from the dimensions of the sample.…”

“…By considering the goodness of fit (R 2 ), the VRH model can be successfully used to analyze the high-temperature resistivity data of the three samples. Magnetoresistance (for an applied magnetic field of 8 T) as a function of temperature for the samples were calculated from the temperature-dependent resistivity data at magnetic fields 0 and 8 T using equation (5):…”

“…Rare-earth-based mixed valent perovskite manganites are well known for their thermopower and magnetoresistance properties. Half-doped Nd-Ca-based manganite Nd 0.5 Ca 0.5 MnO 3 is an interesting compound due to its exciting electric and magnetic properties [5][6][7] and is seldom studied for its thermopower properties. The equal concentration of Mn 3+ and Mn 4+ may give exciting MR properties for this compound.…”