Abstract
We electrochemically synthesized film-type vanadium hexacyanochromate-based magnets with high critical temperatures (Tc): KI0.31VII0.49VIII0.51[CrIII(CN)6]0.94·6.5H2O (1) (Tc = 310 K) and KI0.61VII0.97VIII0.03[CrIII(CN)6]0.88·7.2H2O·0.4C2H5OH (2) (Tc = 345 K). The colors of these films were blue and dark blue. For film 1, the Faraday ellipticity (FE) spectra showed a weak negative peak (A) and a strong negative peak (B) around 550 nm (−640 deg cm-1 at 50 K) and 660 nm (−2300 deg cm-1 at 50 K), respectively. In the Faraday rotation (FR) spectra, two dispersive-shaped lines were observed at the same wavelength. Simulation of these spectra showed that the observed spectra can be classified as the paramagnetic type of Faraday effects. For film 2, the Faraday effect was observed even above room temperature. In its FE spectra, two negative peaks were observed around 530 nm (−850 deg cm-1 at 50 K) and 660 nm (−300 deg cm-1 at 50 K), respectively. These FE peak positions are close to the peak positions of A and ...
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