Thickness-induced insufficient oxygen reduction in La2-xCexCuO4 thin films - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: A series of electron-doped cuprate La2-xCexCuO4 thin films with differentthicknesses have been fabricated and their annealing time are adjustedcarefully to ensure the highest superconducting transition temperature. Thetransport measurements indicate that, with the increase of the film thickness<100 nm, the residual resistivity increases and the Hall coefficient shiftsin the negative direction. Further more, the X-ray diffraction data reveal thatthe c-axis lattice constant c0 increases with the decrease of film thickness.These abnormal phenomena can be attributed to the insufficient oxygen reductionin the thin films. Considering the lattice mismatching in the ab-plane betweenthe SrTiO3 substrates and the films, the compressive stress from the substratesmay be responsible for the more difficult reduction of the oxygen in the thinfilms.



Author: B. X. Wu, K. Jin, J. Yuan, H. B. Wang, T. Hatano, B. R. Zhao, B. Y. Zhu

Source: https://arxiv.org/







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