Critical properties of the double-exchange ferromagnet Nd0.6Pb0.4MnO3

Article

关键词: EQUATION-OF-STATE;    COLOSSAL-MAGNETORESISTANCE;    CRITICAL-BEHAVIOR;    MAGNETIC TRANSITION;    PHASE-TRANSITION;    TEMPERATURE;    MANGANITES;    DYNAMICS;    NICKEL;   

DOI  :  10.1103/PhysRevB.68.144408

来源: SCIE

【 摘 要 】

Results of a study of dc magnetization M(T,H), performed on a Nd0.6Pb0.4MnO3 single crystal in the temperature range around T-C (Curie temperature) which embraces the supposed critical region \epsilon\=\T-T-C\/T(C)less than or equal to0.05 are reported. The magnetic data analyzed in the critical region using the Kouvel-Fisher method give the values for the T-C=156.47+/-0.06 K and the critical exponents beta=0.374+/-0.006 (from the temperature dependence of magnetization) and gamma=1.329+/-0.003 (from the temperature dependence of initial susceptibility). The critical isotherm M(T-C,H) gives delta=4.54+/-0.10. Thus the scaling law gamma+beta=deltabeta is fulfilled. The critical exponents obey the single scaling equation of state M(H,epsilon)=epsilon(beta)f(+/-)(H/epsilon(beta+gamma)), where f(+) for T>T-C and f(-) for T

【 授权许可】

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