Ruderman-Kittel-Kasuya-Yosida-like ferromagnetism in MnxGe1-x.
Ruderman-Kittel-Kasuya-Yosida-like ferromagnetism in MnxGe1-x.
复制标题
DOI：
10.1103/physrevlett.90.047204
复制
发表时间：
2003-01
影响因子：
8.6
通讯作者：
Yu-Jun Zhao;T. Shishidou;A. Freeman
中科院分区：
文献类型：
--
作者：
Yu-Jun Zhao;T. Shishidou;A. Freeman
通过对 MnxGe1-x 进行高精度电子和磁性计算，研究磁性半导体中铁磁性的性质和起源，作为大型超级晶胞中 Mn 位点位置的函数。令人惊讶的是，即使对于较大的 Mn-Mn 距离，耦合也并不总是铁磁 (FM)。 Mn 离子之间的交换相互作用随着它们之间的距离而振荡，并遵循 Ruderman-Kittel-Kasuya-Yosida 解析公式。估计的居里温度与最近的实验吻合得很好，并且估计的有效磁矩约为1.7mu(B)/Mn，与实验值(1.4-1.9)mu(B)/Mn 非常吻合。
The nature and origin of ferromagnetism in magnetic semiconductors is investigated by means of highly precise electronic and magnetic property calculations on MnxGe1-x as a function of the location of Mn sites in a large supercell. Surprisingly, the coupling is not always ferromagnetic (FM), even for large Mn-Mn distances. The exchange interaction between Mn ions oscillates as a function of the distance between them and obeys the Ruderman-Kittel-Kasuya-Yosida analytic formula. The estimated Curie temperature is in good agreement with recent experiments, and the estimated effective magnetic moment is about 1.7mu(B)/Mn, in excellent agreement with the experimental values, (1.4-1.9)mu(B)/Mn.