Magnetisation and Electron Spin Resonance of the colossal magnetoresistive La0.67Ca0.33Mn1-x FexO3

• Autorzy: Zając T. , Folcik L. , Chmist J. , Kołodziejczyk A. , Drulis H. , Krop K. , Gritzner G.
• Języki publikacji: EN

Abstrakty

EN

We report magnetisation and electron spin resonance (ESR) measurements on colossal magnetoresistive manganites La0.67Ca0.33Mn1-x FexO3 with x = 0, 0.01, 0.03, 0.06, 0.10 and 0.15 in the vicinity of the magnetic (TC) and metal- insulator (TMI) transition temperatures. Above TC the resonance lines with g?2 are caused by the ferromagnetic metallic clusters exhibiting the double exchange interaction between Mn3+-Mn4+ ions. The lines were observed with cooling far below both TC and TMI and were fitted by Dysonian line-shape. Temperature dependences of the linewidths exhibited a minimum value at Tmin?1.25 TC followed by an increase of the width with further cooling toward TC. The anomalous behaviour of the line-width below Tmin is due to an appearance of a ferromagnetic metallic phase within the paramagnetic matrix. The role of phase segregation in which the compounds are phase - separated into a mixture of ferromagnetic and paramagnetic regions is discussed.

Słowa kluczowe

EN

iron substituted manganite; electron spin resonance; ESR; phase segregation

PL

manganity; elektronowy rezonans spinowy; magnetyzacja; namagnesowanie; separacja faz; kolosalny magnetoopoór

• Wydawca: De Gruyter
• Czasopismo: Materials Science Poland
• Rocznik: 2006
• Tom: Vol. 24, No. 3
• Strony: 795--801
• Opis fizyczny: Bibliogr. 12 poz.

Twórcy

autor

Zając T.

autor

Folcik L.

autor

Chmist J.

autor

Kołodziejczyk A.

autor

Drulis H.

autor

Krop K.

autor

Gritzner G.

• Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, 30-059 Kraków,

Bibliografia

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