Intrinsic electron-doping in nominal "non-doped" superconducting (La,Y)${}_2$CuO${}_4$ thin films grown by dc magnetron sputtering

Abstract

The superconducting nominal "non-doped" $L{a}_{1.85}{Y}_{0.15}Cu{O}_4$ (LYCO) thin films are successfully prepared by dc magnetron-sputtering and in situ post-annealing in vacuum. The best $T_{C0}$ more than 13K is achieved in the optimal LYCO films with highly pure c-axis oriented T'-type structure. In the normal state, the quasi-quadratic temperature dependence of resistivity, the negative Hall coefficient and effect of oxygen content in the films are quite similar to the typical Ce-doped T'-214 cuprates, suggesting that T'-LYCO shows the electron-doping nature like known n-type cuprates, and is not a band superconductor as proposed previously. The charge carriers are considered to be induced by oxygen deficiency.

5 pages, 7 figures

References in corpus (4)

• New class of T-prime-structure cuprate superconductors
• Phase control of La2CuO4 in thin-film synthesis
• Influence of doping level on the Hall coefficient and on the thermoelectric power in $N{d}_{2-x}C{e}_{x}Cu{O}_4$
• Origin of superconducting carriers in "non-doped" T'- (La,RE)2CuO4 (RE = Sm, Eu, Gd, Tb, Lu, and Y) prepared by molecular beam epitaxy

Cited by in corpus (3)

• Superconductivity in undoped T' cuprates with Tc over 30 K
• New superconduting cuprates with no effective doping: T'-(La3+)2-x(RE3+)xCuO4
• Origin of superconductivity in nominally "undoped" T'-La${}_{2-x}$Y${}_x$CuO${}_4$ films