The stability of the charge-ordered state against variations of temperature ( T ) and external magnetic field ( H ) has been investigated for Pr 0.65 (Ca 1- y Sr y ) 0.35 MnO 3 crystals with controlled one-electron bandwidth. For y =0.3, the charge- and orbital-ordering appears below 200 K as in the y <0.3 crystals, but collapses into the metallic state below 100 K. Under a magnetic field, such a reentrant feature is observed in a wider region of y (<0.3). A variation of the H - T phase diagram for the charge-ordered state with the one-electron bandwidth is presented in view of the origin of the colossal magnetoresistance.
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Tomioka et al. (1997) studied this question.
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