C. Niedermayer et al., COMMON PHASE-DIAGRAM FOR ANTIFERROMAGNETISM IN LA2-XSRXCUO4 AND Y1-XCAXBA2CU3O6 AS SEEN BY MUON SPIN ROTATION, Physical review letters, 80(17), 1998, pp. 3843-3846
By zero field muon spin rotation we studied the antiferromagnetic corr
elations in the single layer system La2-xSrxCuO4 and the bilayer syste
m Y1-xCaxBa2Cu3O6. We observe a common phase diagram as a function of
hole doping per plane with two distinct transitions in the magnetic gr
ound state. The first transition marks the border between the 3D antif
erromagnetic state and a disordered state with short ranged correlatio
ns. The second transition marks a distinct change in the magnetic corr
elations at the onset of superconductivity.