Enhanced stability of charge and orbital order in La0.78Sr2.22Mn2O7
نویسندگان
چکیده
Not only is zigzag charge and orbital ~CO! order shown to be present in the highly doped (x50.61) bilayered manganite system La222xSr112xMn2O7 , it demonstrates an enhanced stability relative to the x 50.5 composition where the ordered state might be expected to have the lowest entropy. No magnetic-field dependence is observed up to 5.25 T. The CO ordering temperature also increases from 210 K at x50.5 to 230 K, and the broad hysteretic conversion of the CO-ordered state to the A-type AF state at low temperatures is only partial. Phase reorganization in this hysteretic mixed-phase region is seen to involve an exponential time relaxation above T550 K, while reorganization ceases below 50 K, apparently due to the thermally activated nature of the underlying dynamics.
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