Critical behavior in single-crystallineLa0.67Sr0.33CoO3

Abstract

The critical behavior of ${\text{La}}_{0.67}{\text{Sr}}_{0.33}{\text{CoO}}_{3}$ single crystal has been investigated from the bulk magnetization measurements around the Curie temperature $({T}_{C})$. The detailed analysis of the magnetization indicates the occurrence of a continuous ferromagnetic to paramagnetic phase transition at 223.0 K. The critical exponents $\ensuremath{\beta}=0.361\ifmmode\pm\else\textpm\fi{}0.007$, $\ensuremath{\gamma}=1.31\ifmmode\pm\else\textpm\fi{}0.001$, and $\ensuremath{\delta}=4.64\ifmmode\pm\else\textpm\fi{}0.01$ characterizing this second order phase transition, have been estimated using different techniques such as the Kouvel-Fisher plot, the Arrott-Noaks plot, and critical isotherm analysis. With these values of ${T}_{C}$, $\ensuremath{\beta}$, and $\ensuremath{\gamma}$, one can scale the magnetization below and above ${T}_{C}$ following a single equation of state. The consistency in the values of the critical exponents obtained from different methods and the well-obeyed scaling behavior confirm that the calculated exponents are unambiguous and purely intrinsic to the system. These values of the exponents match well with those theoretically predicted for the three-dimensional Heisenberg model with nearest-neighbor interaction.