Single-crystal ac susceptibility measurements on [Co(NH<inf>3</inf>) <inf>6</inf>][CuCl<inf>5</inf>], a 3D, S=1/2 Heisenberg antiferromagnet

Mary C. Moròn, Fernando Palacio, Josefina Pons, Jaime Casabo, K. E. Merabet, Richard L. Carlin

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Single-crystal ac magnetic susceptibilities of [Co(NH3) 6][CuCl5] along the three crystallographic axes in the temperature range from 1.1 to 90 K are presented. The magnetic behavior is characteristic of a three-dimensional antiferromagnet, its ordering temperature being at Tc=3.8 K. Susceptibilty data can be fit to a Heisenberg S=1/2 simple cubic model using high-temperature series expansions extrapolated with Pade approximants. Good agreement is found for an exchange constant J/kB=-3.13 K and values of g factor ga=2.09, g b=gc =2.04, a,b, and c being the crystallographic axes. This result makes [Co(NH3)6][CuCl5] one of the few examples of a 3D antiferromagnetic Heisenberg S=1/2 model. The magnetic behavior below Tc indicates the existence of crystallographic domains due to the structural transition from cubic to tetragonal symmetry that the system has at about 280 K.
Original languageEnglish
Pages (from-to)3566-3568
JournalJournal of Applied Physics
Issue number8
Publication statusPublished - 1 Dec 1988


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