Antiferromagnetic phase in Zn- and Ni-doped CuGeO3
Antiferromagnetic phase in Zn- and Ni-doped CuGeO3
复制标题
Zn 和 Ni 掺杂 CuGeO3 中的反铁磁相
DOI：
10.1007/bf02570982
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
K. Uchinokura
中科院分区：
文献类型：
--
作者：
N. Koide;Y. Sasago;T. Masuda;K. Uchinokura
通过测量单晶Cu 1 − xMxGeO 3（M=Zn，Ni）的磁化率，研究了杂质对无机自旋Peierls材料CuGeO 3的影响。我们成功地生长出了掺Zn（0.007≤x≤0.09）和掺Ni（x =0.033）的单晶。我们测定了掺锌单晶的温度-x相图，这与多晶样品的温度-x相图几乎相同。在Cu 1 − xZnxGeO 3和Cu 1 − xNixGeO 3中，反铁磁转变都发生在低于5 K的温度下。结果表明，Ni掺杂的CuGeO_3的易磁化轴基本上沿沿着a轴，而Zn掺杂的CuGeO_3的易磁化轴基本上沿沿着c轴. Zn掺杂和Ni掺杂CuGeO 3自旋有序度的差异是由于Ni ~（2+）离子携带自旋S =1，而Zn ~（2+）离子携带自旋S =1。
The magnetic susceptibility of single crystals Cu1−xMxGeO3 (M=Zn, Ni) were investigated to study the effects of impurities on the inorganic spin-Peierls material CuGeO3. We succeeded in the growth of Zn-doped single crystals with 0.007≤x≤0.09 and Ni-doped ones withx=0.033. We determined temperature vsx phase diagram of the Zn-doped single crystals, which is almost identical to that of the polycrystaline samples. In both Cu1−x ZnxGeO3 and Cu1−xNixGeO3, the antiferromagnetic transition occurs below 5 K. It is proved that the easy axis of Ni-doped CuGeO3 is nearly along thea axis, while that of Zn-doped CuGeO3 is along thec axis as previously reported. This difference of spin orderings between Zn-doped and Ni-doped CuGeO3 is caused by that Ni2+ ions carry spinS=1 while Zn2+ ions are nonmagnetic.