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 00:00:00 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, Vol. 1349, Issue 1; Conference: 55. DAE solid state physics symposium 2010, Manipal (India), 26-30 Dec 2010; Other Information: DOI: 10.1063/1.3606326; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

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