Magnetic properties of hole-doped SCGO, SrCr₈Ga_4−xM_xO₁₉(M = Zn, Mg, Cu)

Abstract

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, SrCr(8)Ga(4-x)M(x)O(19) (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(8)Ga(4-x)Cu(x)O(19) series an enhancement of the spin-glass-like transition is observed, T(f)∼ 6 K, which we ascribe to the magnetic nature of the Cu2+ (d9) dopant.

NaCaCo2F7 : A single-crystal high-temperature pyrochlore antiferromagnet

“…Rearranging the Curie-Weiss Law to C/(χ|θ|)=T/|θ|-1 it is possible to construct a normalized, dimensionless plot that is scaled by the effective moment (C) and the strength of the magnetic interactions (|θ|). 11 This type of plot allows different materials to be easily compared, and Figure 3 compares NaCaCo 2 F 7 and NaSrCo 2 F 7 in this way. Ideal antiferromagnets would follow the line y=x+1 (shown as a dashed line), with indications of magnetic ordering on the order of T/θ ~ 1.…”

NaCaNi2F7: A frustrated high-temperature pyrochlore antiferromagnet withS=1NKrizan1, Cava2 2015Phys. Rev. B484550View full textAdd to dashboardCite

“…26 In Figure 3, ideal antiferromagnets would follow the line y=x+1 (shown as a dashed line), with indications of magnetic ordering on the order of T/|θ| ≈ 1. Using this representation, the magnetic behavior of NaCaNi 2 F 7 is compared to NaCaCo 2 F 7 .…”

“…By rearranging the Curie-Weiss law (χ=C/T-θ) to C/(χ|θ|)=T/|θ|-1 it is possible to create a normalized, dimensionless plot that is useful for comparing the magnetic behavior of related materials. 18 In Figure 3, ideal antiferromagnets would follow the line y=x+1 (shown as a dashed line), with indications of magnetic ordering on the order of T/|θ| ≈ 1. Using this representation, the magnetic behavior of NaCaNi 2 F 7 is compared to NaCaCo 2 F 7 .…”

Magnetic transitions in the chiral armchair-kagome system Mn2Sb2O7

“…Weiss law M/H = C/(T − T CW ) as CH/M T CW = T /T CW − 1 28 . Data above the dashed line indicate additional antiferromagnetic interactions, while points can be pushed below the line by ferromagnetic interactions.…”