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

    Research output: Contribution to journalArticle

    Abstract

    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 (US)
    Article number174405
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume82
    Issue number17
    DOIs
    StatePublished - Nov 3 2010

    Fingerprint

    magnetic permeability
    Demagnetization
    Curie-Weiss law
    demagnetization
    Prisms
    Temperature
    prisms
    Lattice constants
    temperature
    aspect ratio
    Aspect ratio
    Ligands
    ligands
    Molecules
    cross sections
    cells
    molecules
    interactions

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Electronic, Optical and Magnetic Materials

    Cite this

    Experimental determination of the Weiss temperature of Mn12 -ac and Mn12 -ac-MeOH. / Li, Shiqi; Bo, Lin; Wen, Bo; Sarachik, M. P.; Subedi, P.; Kent, A. D.; Yeshurun, Y.; Millis, A. J.; Lampropoulos, C.; Mukherjee, S.; Christou, G.

    In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 17, 174405, 03.11.2010.

    Research output: Contribution to journalArticle

    Li, S, Bo, L, Wen, B, Sarachik, MP, Subedi, P, Kent, AD, Yeshurun, Y, Millis, AJ, Lampropoulos, C, Mukherjee, S & Christou, G 2010, 'Experimental determination of the Weiss temperature of Mn12 -ac and Mn12 -ac-MeOH', Physical Review B - Condensed Matter and Materials Physics, vol. 82, no. 17, 174405. https://doi.org/10.1103/PhysRevB.82.174405
    Li, Shiqi ; Bo, Lin ; Wen, Bo ; Sarachik, M. P. ; Subedi, P. ; Kent, A. D. ; Yeshurun, Y. ; Millis, A. J. ; Lampropoulos, C. ; Mukherjee, S. ; Christou, G. / Experimental determination of the Weiss temperature of Mn12 -ac and Mn12 -ac-MeOH. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 17.
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    abstract = "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.",
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    AU - Li, Shiqi

    AU - Bo, Lin

    AU - Wen, Bo

    AU - Sarachik, M. P.

    AU - Subedi, P.

    AU - Kent, A. D.

    AU - Yeshurun, Y.

    AU - Millis, A. J.

    AU - Lampropoulos, C.

    AU - Mukherjee, S.

    AU - Christou, G.

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    N2 - 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.

    AB - 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.

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