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Magnetic and magnetoresistive properties of sodium-substituted lanthanum manganites
- Source :
- Low Temperature Physics. 36:220-225
- Publication Year :
- 2010
- Publisher :
- AIP Publishing, 2010.
-
Abstract
- The magnetic, electric, and magnetoresistive properties of bulk samples of La1−xNaxMnO3±δ (x=0.08–0.16) are studied. It is shown that at low temperatures all samples are ferromagnetic and the temperature of the transition from the paramagnetic into the ferromagnetic state increases with increasing sodium content. It is found that the saturation magnetization reaches its maximum value, close to that computed theoretically, in samples with x=0.12. A deviation of x from 0.12 decreases the saturation magnetization and broadens the magnetic transition. Analysis of the behavior of the magnetoresistance shows that there exists, together with the ferromagnetic conducting phase, a disordered weakly conducting phase, the volume fraction of the latter increasing as x deviates away from 0.12. The characteristic behavior of the magnetic and magnetoresistive properties of La1−xNaxMnO3±δ samples are tied to the particulars of the evolution of the chemical composition and defectiveness of the samples as a function of the...
- Subjects :
- Materials science
Physics and Astronomy (miscellaneous)
Magnetic domain
Magnetoresistance
Condensed matter physics
General Physics and Astronomy
chemistry.chemical_element
Condensed Matter::Materials Science
Paramagnetism
Magnetization
Ferromagnetism
chemistry
Phase (matter)
Volume fraction
Lanthanum
Condensed Matter::Strongly Correlated Electrons
Subjects
Details
- ISSN :
- 10906517 and 1063777X
- Volume :
- 36
- Database :
- OpenAIRE
- Journal :
- Low Temperature Physics
- Accession number :
- edsair.doi...........89a875a838b4b67261481a39e1fd4e63