Mössbauer study of Cr-based chalcogenide spinels Fe1-xCuxCr2S4
Sprache des Titels:
Englisch
Original Kurzfassung:
We report on the magnetic and electronic state of iron in Cu-substituted Cr-based thiospinels of the nominal
composition Fe1-xCuxCr2S4 (x 0 0.25; 0.5; 0.75), a class of compounds which recently raised considerable interest in
relation with the colossal magnetoresistance effect they display. 57Fe Mössbauer measurements carried out at different temperatures revealed the gradual transformation of iron from the state of Fe2+ (representative for x = 0) to the state of Fe3+ (representative for x>= 0.5), along with a simultaneous increase in the magnetic ordering temperature. In Fe0.75Cu0.25Cr2S4, where Fe2+ and Fe3+ oxidation states were found to coexist, the Mössbauer–Lamb factor characteristic of Fe3+ sites was found to exceed that characteristic of Fe2+ sites. Special attention is paid to the composition with x = 0.5. This compound was found to display a Curie temperature TC 340K; a value which
considerably exceeds the recently reported TC value for a single crystal with the same average composition.
Sprache der Kurzfassung:
Englisch
Journal:
Physica B: Condensed Matter
Volume:
358
Seitenreferenz:
93 – 102
Erscheinungsjahr:
2005
ISSN:
0921-4526
Anzahl der Seiten:
10
Notiz zur Publikation:
The effect of iron doping in La0.8Sr0.257Fe0.05Co0.95O3-d and Eu0.8Sr0.2(FexCo1-x)O3-d perovskites
Z. Németh, Z. Klencsár, E. Kuzmann, Z. Homonnay, A. Vértes, B. Lackner, K. Kellner,
G. Gritzner, J. Hakl, K. Vad, S. Mészáros, L. Kerekes, G. Molnár and A. Bousseksou
Eur. Phys. J. B, 43 (2005) 297 - 303
Forschungs-