Abstract
Doping dependence of the local lattice distortions in YBa2Cu3Oy: thin films epitaxially grown on SrTiO3 has been studied by polarized extended x-ray absorption fine structure (EXAFS). We find that the in-plane Cu-O bond distribution becomes asymmetric and broadens below a characteristic temperature T*. The results indicate that distorted domains are characterized by an elongated in-plane Cu2-O2/O3 bond. The observed Cu-O relative displacement shows signatures of local anomalies at Tc and a few tens of Kelvin above Tc, i.e., a sharp increase of the magnitude of Fourier transform ∼1.6Tc a maximum at ∼1.3Tc and a minimum at Tc. The outcome suggests that temperature and doping dependent anomalies in the local lattice dynamics, below T* in the normal state, are universal to the high-Tc superconductors.
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Oyanagi, H., Zegenhagen, J., Haage, T. (2002). Local Lattice Distortions in YBa2Cu3Oy: Doping Dependence. In: Bianconi, A., Saini, N.L. (eds) Stripes and Related Phenomena. Selected Topics in Superconductivity, vol 8. Springer, Boston, MA. https://doi.org/10.1007/0-306-47100-0_27
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DOI: https://doi.org/10.1007/0-306-47100-0_27
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