Abstract
We have studied the local atomic structure of La{sub 2-x}A{sub x}CuO{sub 4} (A=Ba, Sr) through the high-temperature tetragonal (HTT) to low temperature orthorhombic (LTO) structural phase transition using the atomic pair distribution function technique. Although long-range ordered tilts disappear in the average structure, we show that significant local tilts persist. We propose an order-disorder model which reconciles both the local and long-range structural observations.
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