CPA APPROACH FOR RANDOMLY DILUTED ANISOTROPIC ANTIFERROMAGNETS: SPIN-FLOP TRANSITION AND AFMRMOREIRA FGB; FITTIPALDI IP.1982; JOURNAL OF PHYSICS. C. SOLID STATE PHYSICS; ISSN 0022-3719; GBR; DA. 1982; VOL. 15; NO 16; PP. 3569-3585; BIBL. 12 REF.Article

NONLINEAR EFFECTS INVOLVING LOCALIZED MAGNON MODES IN IMPURE FERROMAGNETIC INSULATORS.FITTIPALDI IP; REZENDE SM.1975; PHYS. REV., B; U.S.A.; DA. 1975; VOL. 12; NO 11; PP. 5081-5093; BIBL. DISSEM.Article

NEW EFFECTIVE-MEDIUM APPROACH FOR RANDOMLY DILUTED UNIAXIAL ANTIFERROMAGNETS: APPLICATION TO FE_1-XZN_XF₂MOREIRA FGB; FITTIPALDI IP.1981; PHYS. REV. B; ISSN 0163-1829; USA; DA. 1981; VOL. 24; NO 11; PP. 6596-6599; BIBL. 16 REF.Article

EXCITATIONS AND LONG-RANGE ORDER IN QUADRUPOLAR-COUPLED SYSTEM AT ZERO TEMPERATURE.FITTIPALDI IP; TAHIR KHELI RA.1975; PHYS. REV., B; U.S.A.; DA. 1975; VOL. 12; NO 5; PP. 1839-1848; BIBL. 15 REF.Article

SPIN-1/2 MODIFIED CALLEN DECOUPLING PROCEDURES IN THE GREEN'S-FUNCTION THEORY OF FERROMAGNETISM.FITTIPALDI IP; COUTINHO MD JR.1974; PHYS. REV., B; U.S.A.; DA. 1974; VOL. 10; NO 11; PP. 4808-4811; BIBL. 14 REF.Article

ON THE FERROMAGNETIC PHASE BREAKDOWN OF A TWO-DIMENSIONAL ISING MODEL WITH COMPETING INTERACTIONSDE ALMEIDA JRL; FITTIPALDI IP; BARRETO FCS et al.1981; J. PHYS. C: SOLID STATE PHYS.; ISSN 0022-3719; GBR; DA. 1981; VOL. 14; NO 13; PP. L403-L406; BIBL. 17 REF.Article

CPA APPROACH FOR RANDOMLY DILUTED ANISOTROPIC FERROMAGNETS: PARA-SPIN-FLOP CRITICAL FIELDBRADY MOREIRA FG; FITTIPALDI IP; STINCHCOMBE RB et al.1981; J. PHYS., C, SOLID STATE PHYS.; ISSN 0022-3719; GBR; DA. 1981; VOL. 14; NO 30; PP. 4415-4432; BIBL. 25 REF.Article

SURFACE FERROMAGNETISM INDUCED BY SURFACE AMORPHIZATION IN A LAYERED ANTIFERROMAGNETIC SYSTEM = FERROMAGNETISME DE SURFACE INDUIT PAR L'AMORPHISATION DE SURFACE DANS UN SYSTEME ANTIFERROMAGNETIQUE EN COUCHESSAKATA K; SARMENTO E; FITTIPALDI IP et al.1982; SOLID STATE COMMUNICATIONS; ISSN 0038-1098; USA; DA. 1982; VOL. 42; NO 1; PP. 13-17; BIBL. 9 REF.Article

PHASE DIAGRAMS OF MIXED CRYSTALS - ISING MODELS = DIAGRAMMES DE PHASES DES CRISTAUX MIXTES - MODELES D'ISINGHONMURA R; KHATER AF; FITTIPALDI IP et al.1982; SOLID STATE COMMUNICATIONS; ISSN 0038-1098; USA; DA. 1982; VOL. 41; NO 5; PP. 385-388; BIBL. 7 REF.Article

SPIN-FLOP TRANSITION IN RANDOM ANTIFERROMAGNETS.TAHIR KHELI RA; REZENDE SM; MOREIRA FGB et al.1976; J. PHYS. C; G.B.; DA. 1976; VOL. 9; NO 15; PP. L403-L408; BIBL. 13 REF.Article

NEW CORRELATED-EFFECTIVE-FIELD THEORY IN THE ISING MODELKANEYOSHI T; FITTIPALDI IP; HONMURA R et al.1981; PHYS. REV. B; ISSN 0163-1829; USA; DA. 1981; VOL. 24; NO 1; PP. 481-484; BIBL. 10 REF.Article

FIELD-INDUCED PHASE TRANSITIONS IN A RANDOMLY DILUTED ANTIFERROMAGNET. MEAN-FIELD DESCRIPTION OF CLASSICAL SPIN MODEL.BRADY MOREIRA FG; FITTIPALDI IP; REZENDE SM et al.1977; PHYS. STATUS SOLIDI, B; ALLEM.; DA. 1977; VOL. 80; NO 1; PP. 385-394; ABS. ALLEM.; BIBL. 12 REF.Article