A Displacive Structural Transformation in the CuO2 Planes of YBa2Cu3Ox at the Underdoped-Overdoped Phase Separation Line
E. Kaldis, J. Röhler, E. Liarokapis, N. Poulakis, K. Conder, P. W. Loeffen
Abstract
A structural phase transformation in the CuO2 planes of YBa2Cu3Ox has been observed at the onset of the overdoped regime, x=6.95. We have measured as a function of x the dimpling in the CuO2 planes by EXAFS, and the O2,3 in-phase (A1g) mode by Raman scattering. The data show for x>6.95 anomalously large static displacements of the Cu2 atoms off the O2,3 layer, and a gap in the distribution of the O2,3 in-phase Raman shifts. We conclude the structure of overdoped YBa2Cu3Ox to be a martensitic form of the structure most favourable for the superconductivity, and possibly at the origin of the split superconducting transition in the overdoped regime.
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