Magnetic and transport properties assisted by local distortions in Bi 2 Mn 4 O 10 and Bi 2 Fe 4 O 9 multiferroic compounds

Autor:	J. Mestnik-Filho, Jose A. Souza, F.E.N. Ramirez, Artur W. Carbonari, Gabriel A. Cabrera-Pasca
Rok vydání:	2015
Předmět:	Condensed matter physics Chemistry Magnetism Mechanical Engineering media_common.quotation_subject Anharmonicity Metals and Alloys Activation energy Atmospheric temperature range Asymmetry Mechanics of Materials Materials Chemistry Antiferromagnetism Multiferroics Hyperfine structure media_common
Zdroj:	Journal of Alloys and Compounds. 651:405-413
ISSN:	0925-8388
DOI:	10.1016/j.jallcom.2015.08.165
Popis:	We have performed a comprehensive study on the magnetic and electrical properties through macroscopic and local characterizations on Bi2Mn4O10 and Bi2Fe4O9. An analysis of the temperature evolution of local distortions, which was obtained by perturbed angular correlation measurements, revealed an anomalous behavior of the quadrupolar frequency and asymmetry parameter below the antiferromagnetic ordering temperature for both samples. The combined results suggest correlations between magnetic, electric, and elastic interactions. At high temperature, we have observed that the hopping frequency and activation energy in the electrical transport mechanism are close related to hyperfine parameters, electrical field gradient and asymmetry parameter, due to modifications in the equilibrium positions of oxygen atoms conforming octahedral, pyramidal, and tetrahedral environments. Anharmonic lattice effects are much more pronounced in a temperature range close to room temperature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4f967e506dad6d828edf6d9fbe16db31 https://doi.org/10.1016/j.jallcom.2015.08.165 Zobrazit plný text záznamu Full Text from ScienceDirect