Energetics of reversible and non-reversible charge disordering effect in manganites induced by external beam irradiation

The reversible electron beam-induced melting and reentrant behavior of charge-ordered state in (Bi,Ca)MnO$_{3 }$phenomenon is in sharp contrast with the non-reversible effect in (Pr,Ca)MnO$_{3}$ observed under similar experimental conditions. In the Pr-manganites the charge disordering effect depends upon the total energy deposited on the sample by the incident beam, whereas in the Bi-manganites the reversible effect is a function of the power input from the incident beam. The energetics of the electron beam-induced effect in these two systems can be understood in the frame work of lifetime of the charge disordered clusters induced by the external irradiation. .