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Title: Influence of samarium doping on electronic and magneto-transport properties of La{sub 0.9−x}Sm{sub x}Sr{sub 0.1}MnO{sub 3} (0.1≤x≤0.5) nanoparticles

We report detailed field dependent electronic- (ρ-T) and magneto- transport (MR-H) studies of La{sub 1−x}Sm{sub x}Sr{sub 0.1}MnO{sub 3} (0.1≤x≤0.5) nanoparticles. Doping induced disorder at La site is observed in field dependent ρ-T measurements of the sample. At low doping side, nice metal to insulator transition (MIT) peak appears in ρ-T data whereas with increasing of Sm{sup +3} contents, metallic behavior is suppressed under the insulating background although a weak signature of MIT is found. Anomalous resistive nature of the samples with increasing of x can be explained in such a way that doping at nonmagnetic La site with magnetic Sm+3 ion induces an extra magnetic coupling in the system which changes the long range ferromagnetic ordering to spin glass/cluster glass state in antiferromagnetic background. The field dependent magneto resistance (MR) mechanism at different temperatures is investigated using spin polarized tunneling model of conduction electrons between two adjacent grains at the grain boundaries. For the sample of x=0.5, maximum 83 % change in MR is found at 8 T near MIT which leads the colossal magneto resistance effect.
Authors:
;  [1] ; ;  [2]
  1. Department of Physics and Meteorology, IIT Kharagpur, Kharagpur-721302, W.B. (India)
  2. Department of Physics and Techno Physics, Vidyasagar University, Midnapore-721102, W.B. (India)
Publication Date:
OSTI Identifier:
22269458
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1591; Journal Issue: 1; Conference: 58. DAE solid state physics symposium 2013, Patiala, Punjab (India), 17-21 Dec 2013; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ANTIFERROMAGNETISM; CONCENTRATION RATIO; GRAIN BOUNDARIES; LANTHANUM COMPOUNDS; MAGNETORESISTANCE; MANGANATES; NANOSTRUCTURES; PARTICLES; SAMARIUM COMPOUNDS; SPIN GLASS STATE; SPIN ORIENTATION; STRONTIUM COMPOUNDS