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(Color online) (a) XRD patterns of Zn1−xAgxO samples. The data of undoped ZnO are also shown as reference. Dependence of lattice parameters (b) and unit cell volume (c) on the Ag concentration. The insets of (c) illustrate the onset of silver oxide clusters at higher doping concentrations.
(Color online) (a) Temperature dependent resistivity of the Zn1−xAgxO samples. (b) Data of vs. for the Ag-doped ZnO samples. The solid straight lines are guide to the eyes.
(Color online) (a) Magnetization vs. magnetic field data measured on Zn1−xAgxO samples at 300 K. (b) Corresponding ferromagnetic hysteresis loops after subtraction of the diamagnetic signal. (c) Enlarged view of the low field data.
(Color online) (a) Temperature dependent magnetization of the 2% Ag-doped ZnO sample measured under a magnetic field of 500 Oe. The magnetic transition temperature is much higher than the limit of the oven attached to Superconducting Quantum Interference Device (780 K, marked as the dashed line). Also shown is the theoretical fitting result (solid line) where partially ordered BMPs are assumed with parameters: TC = 995 K, nh = 3.403 × 1015 cm−3, m 0 = 3.954 × 10−3 emu/cm3, δ = 8.007 × 10−3. (b) Illustration of two interacting magnetic polarons with localized carriers (hollow arrows) surrounded by magnetic impurities (solid arrows). The spins within the overlap region mediate the magnetic interactions.
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