Abstract
Structural and magnetic properties have been investigated for half-doped single-layer manganites RE 0.5 Sr 1.5 MnO 4 [ RE = La, (La, Pr), Pr, Nd, Sm, and Eu]. Analyses of electron diffraction and ac susceptibility measurements have revealed that the long-range charge–orbital ordering (CO–OO) state as observed in La 0.5 Sr 1.5 MnO 4 is suppressed for the other materials: the CO–OO transition temperature, as well as the correlation length decreases with a decrease in the cation size of RE . Such a short-range CO–OO state shows a spin-glass behavior at low temperatures. A new electronic phase diagram is established with quenched disorder as the control parameter.
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