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

Journal Article · Thu Apr 24 00:00:00 EDT 2014 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4872597· OSTI ID:22269458

Nath, Tapan Kumar ^[1]; Gupta, Kajal; Jana, Paresh Chandra ^[2]

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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)

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.

• OSTI ID: 22269458
• Journal Information: AIP Conference Proceedings, Vol. 1591, 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); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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