Magnetic pair-making double exchange coupling in Ru substituted orthomanganites, La(0.7)A(0.3)Mn(0.9)Ru(0.1)O(3)

Authors
Sahu, RK Manoharan, SS
Citation
Rk. Sahu et Ss. Manoharan, Magnetic pair-making double exchange coupling in Ru substituted orthomanganites, La(0.7)A(0.3)Mn(0.9)Ru(0.1)O(3), APPL PHYS L, 77(15), 2000, pp. 2382-2384
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
77
Issue
15
Year of publication
2000
Pages
2382 - 2384
Database
ISI
SICI code
0003-6951(20001009)77:15<2382:MPDECI>2.0.ZU;2-H
Abstract
A detailed study of Ru substitution at the Mn site in La(0.7)A(0.3)Mn(0.9)R u(0.1)O(3) (A=Ca, Sr, Pb, Ba) polycrystalline samples shows an unusual magn etic pair between Ru+4/Ru+5 and Mn+4/Mn+3 redox couple. As a result, in the entire 10 at. % Ru-substituted compositions, the T-C varies only by 10-30 K. The similarity of Mn4+/Ru4+:e(g) parentage facilitates a redox interacti on between Mn and Ru ions, Ru+4/+5/Mn+3/+4. Ruthenium (IV) low spin state h as a magnetic moment of 2.7-2.9 mu(B), and with an extended 4d orbital, it enhances exchange coupling between Mn and Ru sites. (C) 2000 American Insti tute of Physics. [S0003-6951(00)05041-5].