Magnetism in the 2D Limit and Interface Superconductivity in   Metal-Insulator La(2-x)Sr(x)CuO(4) Superlattices
  We show, by means of low-energy muon spin rotation measurements, that few-unit-cells thick La(2)CuO(4) layers synthesized digitally by molecular beam epitaxy synthesis are antiferromagnetically ordered. Below a thickness of about 5 CuO(2) layers the long-range ordered state breaks down, and a magnetic state appears with enhanced quantum fluctuations and a reduced spin stiffness. This magnetic state can exist in close proximity (few Angstrom) to high-temperature superconducting layers, without transmitting supercurrents. 
A. Suter, E. Morenzoni, T. Prokscha, B.M. Wojek, H. Luetkens, G.   Nieuwenhuys, A. Gozar, G. Logvenov, I. Bozovic
cond-mat.str-el