Abstract
The effects of Mn substitution for Cu on conductivity and magnetism in La1.85−xSr0.15+xCu1−xMnxO4 have been investigated by electric resistivity, dc magnetic susceptibility, and electron spin resonance measurements. Superconductivity with x up to 0.1 was observed. Variable range hoping transport due to the random potential introduced by Mn doping was suggested. Sudden decrease in resistivity for x>0.34 is related to the formation of Mn–O–Mn percolative conducting channel. The occurrence of ferromagnetism and antiferromagnetism for x⩾0.2 is understood based on the discussion about the variation of valent state of Mn.
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