Correlation between the giant volume magnetostriction and softening of the crystal lattice in GMR manganites

Correlation between the giant volume magnetostriction and softening of the crystal lattice in GMR manganites

Giant volume magnetostriction near the Curie temperature T C has been revealed in single crystals and ceramics of the La1 − x A xMnO3 (A = Sr, Ba, Ca, Ag) and Re 1 − x SrxMnO3 (Re = Sm, Tb0.25Nd0.3, Eu0.4Nd0.15, Eu) compositions; its values were as high as ∼10−3 in a magnetic field of 8.2 kOe. The g...

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Veröffentlicht in:Bulletin of the Russian Academy of Sciences. Physics 2007-11, Vol.71 (11), p.1581-1583
Hauptverfasser: Koroleva, L. I., Demin, R. V., Abramovich, A. I., Zashchirinskii, D. M., Kozlov, A. V., Pavlov, V. Yu
Format: Artikel
Sprache:eng
Schlagworte:
Barium
Calcium
Crystal lattices
Curie temperature
Giant magnetoresistance
Magnetism
Magnetoresistance
Magnetoresistivity
Magnetostriction
Manganites
Single crystals
Strontium
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Zusammenfassung:Giant volume magnetostriction near the Curie temperature T C has been revealed in single crystals and ceramics of the La1 − x A xMnO3 (A = Sr, Ba, Ca, Ag) and Re 1 − x SrxMnO3 (Re = Sm, Tb0.25Nd0.3, Eu0.4Nd0.15, Eu) compositions; its values were as high as ∼10−3 in a magnetic field of 8.2 kOe. The giant volume magnetostriction and giant magnetoresistance behave similarly near T C: the temperature dependences of their moduli pass through a maximum, and their isotherms are similar. This phenomenon is explained by the presence of a magnetic two-phase state in these compositions, which is caused by the strong s-d exchange.
ISSN:1062-8738
1934-9432
DOI:10.3103/S1062873807110330