Magnetic and Magnetotransport Properties of (Pr{sub 0.7}Sr{sub 0.3}MnO{sub 3}){sub 1-x}/NiO{sub x} Composites

Journal Article · Fri Jul 15 04:00:00 EDT 2011 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3606326· OSTI ID:21608133

Chand, Umesh; Yadav, Kamlesh; Varma, G D ^[1]; Gaur, Anurag ^[2]

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1. Department of Physics, Indian Institute of Technology Roorkee, Roorkee-247667 (India)
2. Department of Physics, National Institute of Technology, Kurukshetra-136119 (India)

In this paper, we report the structural, magnetic and magnetotransport properties of (Pr{sub 0.7}Sr{sub 0.3}MnO{sub 3}){sub 1-x}/NiO{sub x}(x = 0, 0.05, 0.10, 0.15 and 0.20) composites samples. The composite samples have been synthesized in such a manner so that there is no reaction between Pr{sub 0.7}Sr{sub 0.3}MnO{sub 3}(PSMO) and NiO. This has been confirmed by XRD and FESEM results. The magnetic measurements show reduction in ferromagnetic ordering in the composite samples with increasing level of NiO. Furthermore, incorporation of NiO phase into Pr{sub 0.7}Sr{sub 0.3}MnO{sub 3} matrix lowers the metal-insulator transition temperature (TIM) and increases the resistance of composites. An enhancement in magnetoresistance (MR) is observed at low temperature, below 140 K, for the composites with x = 0.05, 0.10 and 0.15 and at high temperature (298K) for all the composites at applied magnetic field H = 5 kOe. It is suggested that the higher value of MR at temperature below 140 K is low field magnetoresistance (LFMR) caused by spin polarized tunneling, whereas at around room temperature it is caused by magnetic disordering.

• OSTI ID: 21608133
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1349; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COMPOSITE MATERIALS
CONCENTRATION RATIO
DIFFRACTION
DIMENSIONLESS NUMBERS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
FERROMAGNETIC MATERIALS
MAGNETIC FIELDS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETORESISTANCE
MANGANATES
MANGANESE COMPOUNDS
MATERIALS
MICROSCOPY
NICKEL COMPOUNDS
NICKEL OXIDES
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPIN ORIENTATION
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TUNNEL EFFECT
X-RAY DIFFRACTION