El. Vavilova et al., INVESTIGATION OF THE PHASE-SEPARATION IN SUPERCONDUCTING REGIONS OF LA2CUO4+DELTA, Physica. C, Superconductivity, 264(1-2), 1996, pp. 74-80
Electrochemically oxidated La2CuO4+delta was investigated by means of
SQUID-magnetometry and La-139 NQR. Several superconducting phases with
different thermal stability have been discovered. It is supposed that
the differences between the most stable phases are connected with the
ordering of the excess oxygen.