Abstract
Samples of YBa/sub 2/(Cu/sub 1-x/Mn/sub x/)/sub 3/O/sub 7- delta /, with x=0.0, 0.025, 0.05, 0.075, 0.10, 0.15, and 0.20, were prepared by the solid diffusion method. Superconductivity with T/sub c/ in the range of 84-92 K was observed through electrical resistivity and magnetic susceptibility measurements. The substitution of Mn for Cu practically did not affect the onset temperature in the resistive transition, although a strong correlation between the transition width broadening and the increase of Mn content was observed. This fact is consistent with the reduction of the superconducting volume fraction determined through the normalized susceptibility data. X-ray diffraction revealed the occurrence of additional phases increasing with the Mn concentration.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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