Multifrequency ESR in ET_2MnCuN(CN)_2_4:A radical cation salt with quasi-two-dimensionalmagnetic layers in a three-dimensional polymeric structure

K. L. Nagy; B. Nafracli; N. D. KushchE. B. YagubskiiE. HerdtweckT. FeherL. F. KissL. ForroA. Janossy

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Multifrequency ESR in ET_2MnCuN(CN)_2_4:A radical cation salt with quasi-two-dimensionalmagnetic layers in a three-dimensional polymeric structure

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The radical cation salt, ET_2MnCuN(CN)_2_4, ET= bis(ethylenedithio)tetrathiafulvalene with an unusualthree-dimensional anionic polymeric network is studied by x-ray diffraction, static susceptibility measure-ments, and electron spin resonance (ESR) at frequencies between 9 and 420 GHz. The magnetic properties aredetermined by the alternating two-dimensional layers of the Mn~(2+)ions of the network and partially chargedET molecules. At ambient temperature the overlap between Mn2+ ions and ET molecules is weak and anexchange integral 4.10-2 K is estimated from their resolved ESR lines. At lower temperatures,ET_2MnCuN(CN)_2_4is not a simple system of weakly interacting paramagnetic ions in spite of the isotropic,Curie-like static susceptibility. There are first-order phase transitions at 292 K and in the range of 120-180 K.One of the lattice constants shows anomalous temperature dependence below 292 K. Anisotropic ESR shiftsappear below 150 K, which we explain by demagnetizing fields of the platelike crystals and an exchange-narrowed fine structure. The latter contributes significantly to the shift when the populations of Zeeman levelsare altered in high magnetic fields at low temperatures. We estimated the exchange coupling between Mn2+ions within a layer, Jmn_mn –48 K and determined the fine structure parameters below 150 K, showing adistortion in the plane of the Mn~(2+)

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《Physical review, B. Condensed matter and materials physics》 |2009年第10期|104407:1-104407:8|共8页
作者
K. L. Nagy; B. Nafracli; N. D. KushchE. B. YagubskiiE. HerdtweckT. FeherL. F. KissL. ForroA. Janossy;
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Department of Experimental Physics and Condensed Matter Research Group of the Hungarian Academy of Sciences,Budapest University of Technology and Economics, P.O. Box 91, H-1521 Budapest, Hungary;

nstitute of Physics of Complex Matter, EPFL, CH-1015 Lausanne, Switzerland;

nstitute of Problems of Chemical Physics, RAS, Chernogolovka, Moscow Region 142432, RussiaTechnische Universitat Munchen, Lichtenberg Str. 4, 85747 Garching, GermanyResearch Institute for Solid State Physics and Optics, P.O. Box 49, H-1525 Budapest, Hungary;

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中图分类物理学;
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Mn2+ ion; ET molecules; electron spin resonance;

Multifrequency ESR in ET_2MnCuN(CN)_2_4:A radical cation salt with quasi-two-dimensionalmagnetic layers in a three-dimensional polymeric structure

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