Magnetic properties of hole-doped SCGO, SrCr8Ga4−xMxO19 (M = Zn, Mg, Cu)
Magnetic properties of hole-doped SCGO, SrCr8Ga4−xMxO19 (M = Zn, Mg, Cu)
复制标题
空穴掺杂 SCGO、SrCr8Ga4−xMxO19 (M = Zn、Mg、Cu) 的磁性
DOI：
--
复制
发表时间：
2011
期刊：
影响因子：
--
通讯作者：
R. Cava
中科院分区：
文献类型：
--
作者：
S. Dutton;E. D. Hanson;C. Broholm;J. Slusky;R. Cava
我们报告的空穴掺杂的SCGO，SrCr8Ga4O19的磁性能的变化，诱导取代非磁性的Ga 3+与非磁性（Mg 2+和Zn 2+）和磁性（Cu 2+）阳离子。通过X射线衍射和磁化率测量研究了所得的固溶体SrCr8Ga4−xMxO19（M = Zn，Mg，Cu）。对于所有情况，至少10%的Ga可以被二价阳离子取代，导致≥5%的Cr 3+（d3）氧化为Cr 4+（d2）。空穴掺杂导致铁磁相互作用的增加，并减少了磁挫折。在SrCr8Ga4−xCuxO19系列中，观察到自旋玻璃状转变的增强，Tf为6K，我们将其归因于Cu2+（d9）掺杂剂的磁性。
We report changes in the magnetic properties of hole-doped SCGO, SrCr8Ga4O19, induced by replacing non-magnetic Ga3+ with both non-magnetic (Mg2+ and Zn2+) and magnetic (Cu2+) cations. The resulting solid solutions, SrCr8Ga4−xMxO19 (M = Zn, Mg, Cu) have been studied by x-ray diffraction and magnetic susceptibility measurements. For all cases, at least 10% of Ga can be replaced by divalent cations resulting in oxidation of ≥5% of the Cr3+ (d3) to Cr4+ (d2). The hole doping results in an increase in ferromagnetic interactions and reduces the magnetic frustration. In the SrCr8Ga4−xCuxO19 series an enhancement of the spin-glass-like transition is observed, Tf∼ 6 K, which we ascribe to the magnetic nature of the Cu2+ (d9) dopant.