Hyperfine interactions, magnetic, transport and structural properties of La0.67Ca0.33Mn0.9457Fe0.06O3

✍ Scribed by J. Przewoźnik; J. Żukrowski; J. Chmist; Z. Tarnawski; A. Kołodziejczyk; K. Krop; K. Kellner; G. Gritzner

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 244 KB
• Volume: 3
• Category: Article
• ISSN: 1862-6351
• DOI: 10.1002/pssc.200562428

✦ Synopsis

Abstract

The La~0.67~Ca~0.33~Mn~0.94~^57^Fe~0.06~O~3~ compound was studied using powder X‐ray diffraction, VSM magnetometry, four‐probe resistance measurements and ^57^Fe Mössbauer spectroscopy. The Mössbauer measurements were performed between 15 K and 850 K and showed good agreement between Curie temperature determined from temperature dependences of the hyperfine field (141 K) and DC magnetization (142 K). They show the inhomogeneous character of the magnetic transition and the coexistence of ferromagnetic and paramagnetic phases in the temperature range 110 K ≤ T < 141 K. Our results confirmed that substitution of Fe^3+^ for Mn^3+^ strongly affects the magnetic and transport properties of the parent compound. It causes a difference between Curie temperature and the metal‐insulator transition temperature of about 80 K and a strong reduction of their values. X‐ray diffraction measurements were performed between 4 and 500 K and showed complete suppression of the thermal expansion anomaly at Curie temperature. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)