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Superconductivity induced by structural reorganization in the electron-doped cuprate Nd$ {2-x}$Ce$ x$CuO$ 4$ by Guarino, Anita; Autieri, Carmine; Marra, Pasquale; Leo, Antonio; Grimaldi, Gaia; Avella, Adolfo; Nigro, Angela is a scholarly article available to read on EtoBox.

What is Superconductivity induced by structural reorganization in the electron-doped cuprate Nd$ {2-x}$Ce$ x$CuO$ 4$ about?

Electron-doped and hole-doped superconducting cuprates exhibit a symmetric phase diagram as a function of doping. This symmetry is however only approximate. Indeed, electron-doped cuprates become superconductors only after a specific annealing process: This annealing affects the oxygen content by only a tiny amount, but has a dramatic impact on the electronic properties of the sample. Here we report the occurrence of superconductivity in oxygen-deficient Nd$_{2-x}$Ce$_x$CuO$_4$ thin films grown in an oxygen-free environment, after annealing in pure argon flow. As verified by x-ray diffraction, annealing induces an increase of the interlayer distance between CuO$_2$ planes in the crystal structure. Since this distance is correlated to the concentration of oxygens in apical positions, and since oxygen content cannot substantially increase during annealing, our experiments indicate that the superconducting phase transition has to be ascribed to a migration of oxygen ions to apical positions during annealing. Moreover, as we confirm via first-principles density functional theory calculations, the changes in the structural and transport properties of the films can be theoretically descr

Author

Guarino, Anita; Autieri, Carmine; Marra, Pasquale; Leo, Antonio; Grimaldi, Gaia; Avella, Adolfo; Nigro, Angela

Published

2020

Language

EN