It is now widely accepted that the magnetic transition in doped manganites that show large magnetoresistance is a type of percolation effect. This paper demonstrates that the transition should be viewed in the context of the Griffiths phase that arises when disorder suppresses a magnetic transition. This approach explains unusual aspects of susceptibility and heat capacity data from a single crystal of La$_{ 0.7}$Ca$_{ 0.3}$MnO$_{ 3}.$
Categories: cond-mat.str-el cond-mat.mtrl-sci