Dominant itinerant ferromagnetism in Eu0.5Sr0.5CoO3: Evidences from both critical analysis and Rhodes-Wohlfarth's criterion

The critical behaviors of ferromagnet Eu0.5Sr0.5CoO3 around T-c = 140.5 K have been comprehensively investigated by analyzing a series of isothermal magnetization M(H) curves. Both modified Arrott plot and Kouvel-Fisher methods give nearly the same critical exponents, which scale nicely the M(H) curves into two different branches below and above Tc. The exponents gamma = 1.044 and delta = 3.06 demonstrate the relevance of mean-field characters for this material. The conclusion of mean-field behavior proves a dominant itinerant ferromagnetism (FM) due to a long range exchange interaction in the system. Meanwhile, by using Rhodes-Wohlfarth's criterion [P. Rhodes, E.P. Wohlfarth, Proc. R. Soc. Lond. A 273 (1963) 247], it is further confirmed that the itinerant FM dominates in the system. (C) 2013 Elsevier B.V. All rights reserved.