Sign of the Electric Field Gradient Tensor and the Nature of the Low Temperature Phase Transition in Fe(pyridine)2Cl2
Mössbauer spectra of Fe(pyridine)2Cl2 have been determined in large external magnetic fields at room temperature and 78 K. The principal component of the electric field gradient tensor is positive and consistent with an electron in the dxy orbital. The results indicate no change in orbital ground state for the low temperature phase transition of this material.
W. M. Reiff et al., "Sign of the Electric Field Gradient Tensor and the Nature of the Low Temperature Phase Transition in Fe(pyridine)2Cl2," Chemical Physics Letters, vol. 28, no. 1, pp. 68-71, Elsevier Limited, Sep 1974.
The definitive version is available at https://doi.org/10.1016/0009-2614(74)80018-7
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