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Titolo:
Critical behavior of La-0.67(BaxCa1-x)(0.33)MnO3 perovskites (0 <= x <= 1)
Autore:
Panagiotopoulos, I; Moutis, N; Stamopoulos, D; Niarchos, D; Pissas, M;
Indirizzi:
Natl Ctr Sci Res Demokritos, Inst Mat Sci, Athens 15310, Greece Natl Ctr Sci Res Demokritos Athens Greece 15310 ci, Athens 15310, Greece
Titolo Testata:
PHYSICA B
, volume: 284, anno: 2000,
parte:, 2
pagine: 1416 - 1417
SICI:
0921-4526(200007)284:<1416:CBOLP(>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHASE-TRANSITION;
Keywords:
Arrott plots; critical exponent; manganese perovskites;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Panagiotopoulos, I Natl Ctr Sci Res Demokritos, Inst Mat Sci, Athens 15310, Greece Natl Ctr Sci Res Demokritos Athens Greece 15310 reece
Citazione:
I. Panagiotopoulos et al., "Critical behavior of La-0.67(BaxCa1-x)(0.33)MnO3 perovskites (0 <= x <= 1)", PHYSICA B, 284, 2000, pp. 1416-1417

Abstract

The magnetic critical behavior in the series La-0.67(BaxCa1-x)(0.33)MnO3 (0 less than or equal to x less than or equal to 1) of manganese perovskitesis studied by means of DC magnetic measurements. As Ca ions are substituted by the larger Ba ions, the transition temperature increases from 265 to 340 K as a result of structural changes. Arrott plots show that only in samples with x greater than or equal to 0.25 the magnetic properties follow thebehavior expected for a conventional second-order ferromagnetic transition. The values of critical exponents (beta, gamma) estimated by modified Arrott plots are found to lie between those predicted for a 3D-Heisenberg modeland those of mean field theory. (C) 2000 Elsevier Science B.V. All rights reserved.

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Documento generato il 06/04/20 alle ore 23:39:27