Abstract
Electron-Paramagnetic-Resonance (EPR) measurements on La2−x Sr x CuO4single crystals provide experimental evidence of a three-spin polaron of twoCu2+ ions and one p hole. The symmetry properties and the peculiartemperature dependence of the g-value of the EPR line indicate the presenceof a dynamical Jahn–Teller distortion (Q 2-mode) and formation of acollective mode of polarons and surrounding strongly correlated Cu ions(bottleneck regime).
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