We report changes in the magnetic properties of hole-doped SCGO, SrCr 8Ga4O19, induced by replacing non-magnetic Ga3+ with both non-magnetic (Mg2+ and Zn2+) and magnetic (Cu2+) cations. The resulting solid solutions, SrCr 8Ga4xMxO19 (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 SrCr 8Ga4xCuxO19 series an enhancement of the spin-glass-like transition is observed, Tf 6K, which we ascribe to the magnetic nature of the Cu2+ (d9) dopant.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics