Magnetic properties of valence-controlled Na_<3y-2>Cr[Cr(CN)_6]_yH_2O
Magnetic properties of valence-controlled Na_<3y-2>Cr[Cr(CN)_6]_yH_2O
复制标题
价态控制的Na_<3y-2>Cr[Cr(CN)_6]_yH_2O的磁性
DOI：
10.1143/jpsj.80.074716
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发表时间：
2011
影响因子：
1.7
通讯作者：
J.E.Kim
中科院分区：
文献类型：
--
作者：
Y.Moritomo;K.Wakaume;Y.Kurihara;J.E.Kim
系统地研究了分子磁体Na3y-2Cr2+[Cr3+(CN)6]yzH2O与Cr2+周围配位数(n≡6y)的关系。与平均场图像一致，在4.7时，铁磁转变温度(T_C)随T_c=240K、T_n=4.0、T_(TC)=263 K而增加。由于磁各向异性的增强，5K时的矫顽力(Hc)随n从Hc=66GATN=4.0增加到4.7时的Hc=228G。对于所有化合物，饱和磁化强度(ms∼0.3uBat 1T，5K)远小于预期值(∼2.0uB)。我们用Cr价交替的相变缺陷解释了被抑制的Min。
Magnetic properties of molecular magnets, Na3y-2Cr2+[Cr3+(CN)6]yzH2O, were systematically investigated as a function of the coordination number (n≡6y) around Cr2+. Consistently with a mean-field picture, the ferrimagnetic transition temperature (Tc) increases withnfromTc= 240 K atn= 4.0 toTc= 263 K at 4.7. The coercivity (Hc) at 5 K increases withnfromHc= 66 G atn= 4.0 toHc= 228 G at 4.7 due to the enhanced magnetic anisotropy. For all the compounds, the saturation magnetization (Ms∼0.3 µBat 1 T and at 5 K) was much smaller than the expected value (∼2.0 µB). We interpreted the suppressedMsin terms of the phase inversion defects of the Cr valence alternation.