Magnetic Properties of Vacance-Controlled Na3y-2Cr[Cr(CN)6]yzH2O

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Magnetic properties of molecular magnets, Na3y-2Cr2+[Cr3+(CN)6]yzH2O, were systematically investigated as a function of the coordination number (n \equiv 6y) around Cr2+. Consistently with a mean-field picture, the ferrimagnetic transition temperature (T_{\text{c}}) increases with n from T_{\text{c}} = 240 K at n = 4.0 to T_{\text{c}} = 263 K at 4.7. The coercivity (H_{\text{c}}) at 5 K increases with n from H_{\text{c}} = 66 G at n = 4.0 to H_{\text{c}} = 228 G at 4.7 due to the enhanced magnetic anisotropy. For all the compounds, the saturation magnetization (M_{\text{s}} \sim 0.3 \mu_{\text{B}} at 1 T and at 5 K) was much smaller than the expected value ({\sim}2.0 \mu_{\text{B}}). We interpreted the suppressed M_{\text{s}} in terms of the phase inversion defects of the Cr valence alternation.
2011-07-15