Typical x-ray diffraction pattern together with the refined curve for the two-phase samples of and with . (○) is the measured x-ray diffraction data. The solid line denotes the calculated profile.
SEM images of the two-phase samples of and with (a) and (b) 0.1.
The spin-gap opening temperature , the superconducting transition temperature , and the superconducting transition width as a function of for the polycrystalline powder samples of and .
Field dependence of the critical current density at for with varying the addition of .
Critical current density at as a function of with varying the magnetic fields (a) , (b) , (c) , (d) , and (e) .
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