Tricritical points in La-based ferromagnetic manganites

abstract

A detailed study of the magnetization M(H,T) of manganites near T-C is presented. Analysis, in the framework of Landau theory of phase transitions (G=G(0)+1/2AM(2)+1/4BM(4)+1/6CM(6)-MH) reveals that for La0.67Ca0.33MnO3 (T-C=267 K), La0.8MnO3 (T-C=250 K), and La0.60Y0.07Ca0.33MnO3 (T-C=150 K) the phase transition is first-order and the B coefficient is temperature dependent, negative near T-C. In field (H

keywords

FIRST-ORDER; MAGNETIC TRANSITION; PARAMAGNETIC PHASE; PARAMETERS; CROSSOVER; 2ND-ORDER

subject category

Physics

authors

Amaral, VS; Araujo, JP; Pogorelov, YG; Sousa, JB; Tavares, PB; Vieira, JM; Algarabel, PA; Ibarra, MR

our authors

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