Moessbauer Study of Super and Semi-Conducting Samples of (57) Fe-Doped (La(2-Y) Sr(Y)) Cu0(4-delta)

摘要

From Mossbauer and resistivity measurements on (La/sub 2-y/ Sr/sub y/) CuO/sub 4-delta/ samples doped with 5/1000 /sup 57/Fe, three successive phases are observed depending on the y value: a semiconducting antiferromagnetic phase for y < 0.02; a semiconducting phase with two-dimensional spin-glass Cu magnetic order for 0.02 < y < 0.07; and a superconducting phase for y > 0.07, where Cu (or Fe-induced) spin-glass order survives. For the highest y value (y = 0.2) this order is clearly governed by the iron impurities interacting through the Cu sublattice. (ERA citation 14:019980)