Abstract
ac Susceptometry has been used to study a number of magnetic molecular solids including a new compound, Mn(II) octaethyltetraazaporphyrin, 6h-MnOETAP, and decamethylmanganocenium tetracyanoethenide, Mn(Cp*)2*TCNE, a previously reported molecule-based ferromagnet. Both of these compounds exhibit signatures of ferromagnetism including significant hysteresis below 2 K and rapidly increasing χT (where χ is the molar susceptibility) with decreasing temperature. However, their ac susceptibility data show relatively strong dependence of χs' and χ" on the frequency of the applied field, indicating a spinglass state. Other molecular ferromagnetic solids examined show much less sensitivity. These studies indicate that the standard practice of characterization by dc and ac susceptometry at a single frequency are clearly insufficient for identifying the magnetic state of a molecular solid.
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Acknowledgement
We thank Dr. Ron Goldfarb for many helpful discussions and the National Institute of Standards and Technology for use of the SQUID magnetometers. We acknowledge the Donors of the Petroleum Research Fund administered by the American Chemical Society for partial support of this work.
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Sommer, R.D., Korte, B.J., Sellers, S.P. et al. Ac Susceptibility Studies of New and Familiar Magnetic Molecular Solids. MRS Online Proceedings Library 488, 471–476 (1997). https://doi.org/10.1557/PROC-488-471
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DOI: https://doi.org/10.1557/PROC-488-471