Experimental determination of the Weiss temperature of Mn12 -ac and Mn12 -ac-MeOH

Shiqi Li, Lin Bo, Bo Wen, M. P. Sarachik, P. Subedi, A. D. Kent, Y. Yeshurun, A. J. Millis, C. Lampropoulos, S. Mukherjee, G. Christou

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We report measurements of the susceptibility in the temperature range from 3.5 to 6.0 K of a series of Mn12 -ac and Mn12 -ac-MeOH samples in the shape of rectangular prisms of length lc and square cross section of side la. The susceptibility obeys a Curie-Weiss law, χ=C/ (T-θ), where θ varies systematically with sample aspect ratio. Using published demagnetization factors, we obtain θ for an infinitely long sample corresponding to intrinsic ordering temperatures T c ≈0.85K and ≈0.74 K for Mn12 -ac and Mn 12 -ac-MeOH, respectively. The difference in Tc for two materials that have nearly identical unit cell volumes and lattice constant ratios suggests that, in addition to dipolar interactions, there is a nondipolar (exchange) contribution to the Weiss temperature that differs in the two materials because of the difference in ligand molecules.

Original languageEnglish
Article number174405
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
StatePublished - 3 Nov 2010


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