Polycrystalline samples of the AlSr(2)LnCu(2)O(x) system (Ln = Y, La..
.Lu) with a crystal structure of perovskite-like 1212-type have been s
ynthesized. The magnetic properties for various intensities of the ext
ernal magnetic field have been investigated in the temperature region
4.2-300 K with AC and DC methods. For some samples additional measurem
ents of specific heat were performed. An explanation of the magnetic p
roperties is proposed. (C) 1998 Elsevier Science B.V. All rights reser
ved.