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Theoretical calculation of magnetic structure variation in Pr5Ni2Si3 compounds

Song, S. H., Snyder, John Evan and Jiles, David 2006. Theoretical calculation of magnetic structure variation in Pr5Ni2Si3 compounds. Journal of Applied Physics 99 (8) , 08P304. 10.1063/1.2173608

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Abstract

The variation of magnetization with temperature of the Pr5Ni2Si3 compound was calculated using a nearest neighbor exchange interaction approximation. Pr atoms, which are the only element in this compound with a net magnetic moment, were classified into three types based on the number of nearest neighbor exchange interactions. The expected magnetization versus temperature curve for each type of Pr atom was calculated using the Brillouin function, as well as the average magnetization versus temperature curve for the entire unit cell. The results show that the “corner” atoms exhibit very different behavior from that of the other types of Pr atoms on the “center” or “edge” sites. This is due to the broken symmetry in exchange interaction at the corner site due to interactions with atoms from outside the unit cell that are in closer proximity than atoms within the unit cell. This is considered to be the cause of a second magnetic phase transition observed at a lower temperature than the Curie temperature.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Magnetic structure; magnetisation; praseodymium alloys; nickel alloys; silicon alloys; exchange interactions (electron); magnetic moments; Curie temperature
Publisher: American Institute of Physics
ISSN: 0021-8979
Last Modified: 04 Jun 2017 02:04
URI: http://orca-mwe.cf.ac.uk/id/eprint/8381

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