Showing papers by "Nikesh A. Shah published in 2013"
TL;DR: In this article, the effect of 200 MeV Ag+15 ion irradiation on LPMO manganite has been investigated and the results of the structural, microstructural, transport and magnetotransport properties of pristine and irradiated LPMI films (150-350 nm) have been discussed.
58 citations
TL;DR: In this paper, a 10-nm LSMO layer shows a large change in resistance with the application of voltage, i.e., exhibiting colossal electroresistance (CER) ~100% (negative) and large positive electroresence (ER) >2683% under 4.5 V at room temperature.
Abstract: PLD grown ZnO/La0.7Sr0.3MnO3/SrTi0.998Nb0.002O3 nanostructured heterostructure has been studied for its nanoelectronic properties at room temperature under zero applied field. XRD φ-scan reveals the epitaxial growth of La0.7Sr0.3MnO3 (LSMO) film, while the transport of 10-nm LSMO manganite layer can be tuned with applied electric field using various field effect configurations. 10-nm LSMO layer shows a large change in resistance with the application of voltage, i.e., exhibiting colossal electroresistance (CER) ~100% (negative) and large positive electroresistance (ER) ~2683% under 4.5 V at room temperature. The variation scenario in 10-nm LSMO transport has been discussed on the basis of electric-field-induced modifications in the charge carrier density and electronic states.
16 citations
TL;DR: In this article, the structural, transport and magnetotransport studies on mono-valent doped La1-xNaxMnO3 (LNMO) (x = 0.05, 0.1 and 0.15) manganites were conducted.
Abstract: We report the results of the structural, transport and magnetotransport studies on mono-valent doped La1-xNaxMnO3 (LNMO) (x = 0.05, 0.1 and 0.15) manganites. XRD measurement and Rietveld refinement on LNMO samples shows that, all the samples crystallize in distorted rhombohedral structure without any additional impurity peaks. The d.c. four probe resistivity measurements show that, the metal-insulator transition temperature (TP) exhibited by the Na doped manganites increases and resistivity decreases with increasing x. This behavior has been explained on the basis of size disorder effect, tolerance factor variation and structural modifications due to large size mono-valent Na-doping. In the metallic region, the resistivity data have been fitted to the zener double exchange (ZDE) polynomial law for all the three samples. Magnetoresistance (MR) studies show a decrease in low temperature (5K) MR while increase in room temperature MR with increase in Na-content in the LNMO manganites.
13 citations
06 Feb 2013
TL;DR: Substitution of monovalent K+ at La3+ in solid state reaction synthesized La1−xKxMnO3(0.0≤x≤0.3) manganites results in metallic behavior.
Abstract: Substitution of monovalent K+ at La3+ in solid state reaction synthesized La1−xKxMnO3(0.0≤x≤0.3) manganites results in metallic behavior. Increase in K+ content (x ≤ 0.15) enhances the FM interactions through ZDE mechanism while for higher x > 0.15, structural disorder and AFM interactions between Mn4+ ions become prominent.
4 citations