Magnetic and Electrical Transport Characteristics of La0.67Sr0.33Mn1-xCuxO3 (x = 0.10, 0.20, and 0.30 ) Nano-crystalline Perovskite Oxides

Bajrang Lal Prashant, Savita Meena, Pritika Jai Banshiwal

Abstract: This work, copper-substituted perovskite oxides La0.67Sr0.33Mn1-xCuxO3 (x = 0.10, 0.20 and 0.30) have been synthesised using the sol-gel method. For examining the effect of Cu substitution (on the Mn site) on the magnetic behaviour, DC magnetization measurements have been made in the temperature range 20 K ? 300 K and under external magnetic fields up to 2.5 kOe. Resistance-temperature measurements were made using the four-probe method in the 300 K ? 20 K temperature range. The three samples are disordered ferromagnetic, with increasing Cu substitution, coercivity and magnetic remanence decrease. The magnetic moment does not saturate to the measuring field of 2.5 kOe, suggesting high anisotropy attributed to the nanoparticle state. The three samples do not show metallic nature; thus, no metal?insulator (M?I) transition is seen. This is due to barriers to electrical transport in the nanoparticle samples obstructing the spin-dependent electron tunnelling across the interface. On cooling the samples from the room temperature, below a certain temperature T0, a sudden rise in resistance shows up. T0 decreases with increasing Cu, from ~102 K in the 10 % Cu substituted sample to ~60K in the 30 % Cu substituted sample.

Keywords: Sol-gel method, Perovskites, Magnetization

How to Cite?: Bajrang Lal Prashant, Savita Meena, Pritika Jai Banshiwal, "Magnetic and Electrical Transport Characteristics of La0.67Sr0.33Mn1-xCuxO3 (x = 0.10, 0.20, and 0.30 ) Nano-crystalline Perovskite Oxides", Volume 12 Issue 12, December 2023, International Journal of Science and Research (IJSR), Pages: 2247-2252, https://www.ijsr.net/getabstract.php?paperid=SR231227140156, DOI: https://dx.doi.org/10.21275/SR231227140156