The temperature dependence of the symmetric exchange interaction by optical phonon modulation of the exchange integral |
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| Authors: | C.E. Zaspel J.E. Drumheller |
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| Affiliation: | 1. Department of Physics, Montana State University, Bozeman, Montana 59715, U.S.A. |
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| Abstract: | By assuming an anharmonic intermolecular potential for lattice displacement and an exponential form for the exchange energy, the exchange interaction is shown to be temperature dependent in the paramagnetic region. Bond strengths are taken from known tabulated results and overlap integrals are calculated with Slater-type orbitals so there are no adjustable parameters. Agreement with experimental results on K2CuCl4 · 2H2O and other layered compounds is shown. |
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