Colossal electroresistance in Sm0.55Sr0.45MnO3

Abstract

We report a colossal resistance drop around insulator-metal transition temperature (TMI) in Sm0.5SSr0.4SMn03 induced by direct current. Polycrystalline samples of Sm0.5SSr0.4SMn03 were synthesized through solid state reaction method, They have been investigated by X-ray diffraction for phase evaluation, scanning electron microscopy for grain morphology and de resistivity measurement techniques for resistivity-temperature behavior. The resistivity-temperature behavior has been measured with different biasing currents (1 rnA, 2.5 rnA,S rnA, lOrnA and 50 rnA), With increasing biasing current, the resistivity of the samples decreased drastically, The change in the resistivity of the samples for bias currents 1 rnA and 50 rnA at TMI was found to be~2560%, This phenomenon of electroresistance is discussed in view of strong interaction between carrier spins and localized spins in Mn ions and percolative mechanism of phase-separation.

Stress and defect induced enhanced low field magnetoresistance and dielectric constant in La0.7Sr0.3MnO3 thin films

“…The family of manganites are not only interesting because of their potential applications in magnetic field sensing and memory devices but also their fascinating and intriguing physics [3,4], not completely explored so far and exciting new results are emerging constantly [5,6]. The hole-doped manganites of general composition Re 1−x A x MnO 3 (Re = rare-earth metal, A = divalent alkali metal) shows the coexistence of different phases and depending on the composition and structural defects, these phases can be modified significantly.…”

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

“…The competition between coexisting AFM and FM phases resulted in the low temperature state of both the systems. The phase-separation concept was used by Mohan et al [35] to explain the resistivity data on Sm 0.55 Sr 0.45 MnO 3 . From the transport and magnetic studies on R 1−x Ca x MnO 3 (R, a rare-earth element, x = 0.88-1).…”

Understanding the transport properties of perovskite compounds as a function of temperature, frequency and DC-bias voltage using experimental measurements and appropriate theoretical models

“…This evolution discloses the presence of the colossal electro-resistance effect in the investigated system. 68,69 Furthermore, the contribution of space charges under increasing electrical polarization confirms the dominant effect of the grain boundary region on the transport properties. In this context, Prakash et al 70 have observed a high dependence of the grain boundary resistance on the variable DC-bias.…”

“…This evolution discloses the presence of the colossal electroresistance effect in the investigated system. 68,69 Furthermore,…”