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The local structure of a trapped photoexcited state of a Fe-Co cyanide magnetic material, Na₀. ₄Co₁. ₃Fe (CN) ₆5H₂O, was investigated by Fe and Co K-edge x-ray-absorption fine-structure spectroscopy. The excited state was prepared by visible-light irradiation at 36 K. In order to obtain detailed structural information, temperature dependence of the local structure was also studied without light irradiation. The Fe-C distance shows almost no change by light irradiation (1. 92 before and after irradiation), while the average Co-N/O distance is noticeably elongated (1. 94 and 2. 08 before and after irradiation, respectively). This phase transformation is caused by the charge transfer from the Fe^II (S=0) -CN-Co^III (S=0) configuration to Fe^III (S=1/2) -CN-Co^II (S=3/2). The local structure of the trapped photoexcited state was found to be identical with that of the high-temperature phase, although the high-temperature phase was created much more effectively by light irradiation than thermal activation.
Yokoyama et al. (Fri,) studied this question.
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