ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The title system is the first mixed insulating magnet to be examined composed of three separate magnetic components. Each of the three possible binary mixtures based on the same isostructural MCl2⋅2H2O components has been examined. The Co/Fe mixture has competing orthogonal spin anisotropies, the Co/Mn mixture competing ferromagnetic and antiferromagnetic exchange interactions, and the Fe/Mn mixture both competing anisotropies and competing exchange interactions. Hence various pairwise competitions will occur in a ternary mixture of these components. Four different compositions are examined, with (x,y)=(0.830,0.681), (0.623,0.464), (0.539,0.377), and (0.366,0.272). These provide representative coverage of several interesting regions in the three binary T−x phase diagrams, specifically in terms of a relative binary composition (rbc) which can be defined for a ternary mixture in pairwise fashion. High temperature susceptibilities follow a Curie–Weiss form χM=C/(T−θ) rather well. Curie constants are approximately as expected based on fractions of different metal ions present, and both C and θ are closest to values characterizing the Co/Mn binary mixture. Low temperature susceptibilities exhibit features suggesting phase transitions. The temperatures at which these occur are often close to what might be anticipated from the binary T−x phase diagrams for the appropriate rbc. In certain cases, however, transitions anticipated on such a basis do not seem to be present. The ternary mixtures also exhibit behavior suggestive of spin glass properties. © 2000 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.372763
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