Origin of the Downturn in Inverse Susceptibility Observed above the Curie Temperature in Perovskite Manganites

Autor:	Zhao Li-Feng, Doyananda Debnath, Xiao Li-Xia, Yuan Song-Liu, Xia Zheng-Cai, Cao Heng, Wang Yong-Qiang, Shang Jing-Lin, Yuan Li, Miao Ju-Hong, Chen Wei
Rok vydání:	2005
Předmět:	Paramagnetism Materials science Ferromagnetism Condensed matter physics Spins Perovskite manganites General Physics and Astronomy Curie temperature Inverse Curie constant
Zdroj:	Chinese Physics Letters. 22:1511-1514
ISSN:	1741-3540 0256-307X
Popis:	The measurement of low-field susceptibility χ as a function of temperature T for La2/3Ca1/3MnO3 shows a significant downturn in 1/χ(T) above the Curie temperature TC, a behaviour generally observed in perovskite manganites. Such a downturn is argued to be due to the segregation of ferromagnetic clusters with larger spins in the paramagnetic matrix. Based on this consideration, a phenomenological expression for χ(T) is proposed, in which the total susceptibility is assumed to be a sum of two susceptibilities arising from magnetic entities in the PM background and the FM clusters with T-dependent effective spins, respectively. The result is in good agreement with the experimental data obtained in La2/3Ca1/3MnO3.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3dd86b5f173aacd27e8b340162acfbd8 https://doi.org/10.1088/0256-307x/22/6/059 Zobrazit plný text záznamu