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- W101078897 abstract "The colossal magnetoresistive of Lao.67Cao.33Mnl-x V x03 (LCMVO),to x=O.30, ceramics have been studied. X-ray diffraction (XRD) patterns showsingle-phase perovskite structure with the presence of some minor impurities forall the samples. The systems exhibit tetragonal and orthorhombic distortedperovskite structures, which resulted from the Jahn Teller distortion. Paramagnetic- Ferromagnetic phase transitions were observed in the X'-temperature curves forall the samples. The Curie temperature, Tc shifts to lower temperature asvanadium, dysprosium and zirconium doping increases respectively, whichindicate the loss of ferromagnetic order. Zirconium doping is observed to decreasethe Te more than the effect of other dopants. For LCMVO system, samples withx=0.0l, 0.02, 0.03 and 0.30 show an enhancement of volume susceptibility as thetemperature increases from 110 K- 140 K, 120 K- 142 K, 123 K-140 K and 77 K-94K respectively. These enhancements are due to the formation of magnetic clusters m the samples. For LCMDO system, all the samples show the typicalferromagnetic-paramagnetic transition and no spin glass behaviour was detected.However, in LCMZO system, the samples with x>0.05 show ferromagnetic onsetfollowed by a cusp when cooling from room temperature. The anomalies were dueto the formation of spin glass in the sample. The transport properties show thetransition of semiconducting to metallic conductivity at T p. The existence of T pand T c was found correlated." @default.
- W101078897 created "2016-06-24" @default.
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- W101078897 date "2001-04-01" @default.
- W101078897 modified "2023-09-27" @default.
- W101078897 title "Colossal magnetoresistance of La0.67Ca0.33Mn1-xAx)3 [A=V, Dy and Zr] perovskite" @default.
- W101078897 hasPublicationYear "2001" @default.
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