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XRD patterns of samples with ranging from 0 to 0.1 in steps of 0.02.
Resistivity vs temperature curves for samples with different K-doping levels. Inset: Magnetization hysteretic loops of the samples with and at 5 K.
Magnetic field dependences of critical current densities at 5 K for bulk samples with various K-doping levels. Inset: Magnetic field dependences of at 5 K for powder samples with and .
Upper: SEM micrographs for the samples with (a) and (b) . Lower: TEM images for the samples with (c) and (d) .
Lattice constants for samples with ranging from 0 to 0.1.
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