Effect of Quenched Disorder on Charge–Orbital–Spin Ordering in Single−Layer Manganites

概要

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Structural and magnetic properties have been investigated for half−doped single−layer manganites RE0.5Sr1.5MnO4 [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 La0.5Sr1.5MnO4 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.
2006-05-15