A review is given of theoretical and experimental data on spontaneous phase separation in nonsuperconducting degenerate magnetic semiconductors and related cuprate high-temperature superconductors. The following phenomena are considered: (1) The electronic phase separation occuring at frozen impurity positions as a result of charge carrier concentration in regions with a changed magnetic state; (2) impuriry (chemical) phase separation when a nonuniform impurity distribution over a crystal is driven simultaneously by interaction between impurity atoms and by their tendency to concentrate inside regions with a changed magnetic ordering.

PACS: 74.72.−h, 74.90.+n, 72.20.Dp, 75.50.Pp (all) DOI: 10.1070/PU1995v038n05ABEH000085 URL: https://ufn.ru/en/articles/1995/5/b/ A1995RH37700002 Citation: Nagaev E L "Phase separation in high-temperature superconductors and related magnetic systems" Phys. Usp. 38 497–520 (1995) BibTexBibNote ® (generic)BibNote ® (RIS)MedlineRefWorks Оригинал: Нагаев Э Л «Разделение фаз в высокотемпературных сверхпроводниках и родственных им магнитных материалах» УФН 165 529–554 (1995); DOI: 10.3367/UFNr.0165.199505b.0529