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Ac Susceptibility Studies of New and Familiar Magnetic Molecular Solids

Published online by Cambridge University Press:  10 February 2011

Roger D. Sommer ,
Brenda J. Korte ,
Scott P. Sellers  and
Gordon T. Yee
Roger D. Sommer
Affiliation:
Department of Chemistry and Biochemistry, University of Colorado, Boulder CO 80309yeeg@colorado.edu
Brenda J. Korte
Affiliation:
Department of Chemistry and Biochemistry, University of Colorado, Boulder CO 80309yeeg@colorado.edu
Scott P. Sellers
Affiliation:
Department of Chemistry and Biochemistry, University of Colorado, Boulder CO 80309yeeg@colorado.edu
Gordon T. Yee
Affiliation:
Department of Chemistry and Biochemistry, University of Colorado, Boulder CO 80309yeeg@colorado.edu
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Abstract

ac Susceptometry has been used to study a number of magnetic molecular solids including a new compound, Mn(II) octaethyltetraazaporphyrin, α-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 χ′ 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 471
Copyright
Copyright © Materials Research Society 1998

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