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TT: Fachverband Tiefe Temperaturen

TT 2: Superconductivity: Sample Preparation, Characterization, Properties and Electronic Structure

TT 2.9: Vortrag

Montag, 16. März 2020, 11:45–12:00, HSZ 103

Properties of sputtered films of the electron-doped Nd_2−xCe_xCuO_4−d superconductor — •Angela Nigro¹, Anita Guarino², Pasquale Marra^3,4, Antonio Leo¹, and Gaia Grimaldi² — ¹Dipartimento di Fisica E. R. Caianiello, Università degli Studi di Salerno, 84084 Fisciano (Salerno), Italy — ²CNR-SPIN, c/o Dipartimento di Fisica E. R. Caianiello, Università degli Studi di Salerno, 84084 Fisciano (Salerno), Italy — ³Graduate School of Mathematical Sciences, The University of Tokyo, Tokyo,Japan — ⁴Department of Physics, Keio University, 4-1-1 Hiyoshi, Yokohama, Kanagawa 223-8521, Japan,Japan

In RE_2−xCe_xCuO_4−d (RE =rare earth) electron-doped cuprates, the superconductivity is harder to achieve since as-grown samples are antiferromagnetic up to high doping levels, and become superconducting only after a special annealing process. The role of the annealing treatment still constitutes an open question for n-type superconductors. We investigate the electrical and structural properties of Nd_2−xCe_xCuO₄ films grown by a sputtering technique in an oxygen deficient environment, in order to obtain information on the complete oxygen-phase diagram. The as-grown samples are non-superconducting and the structural properties are consistent with a deficiency of the oxygen content. Unexpectedly, a reducing thermal treatment at high temperature is able to induce superconductivity in these films. Our data seem to support the picture that the high-temperature annealing procedure induces a peculiar oxygen atoms distribution triggering the superconducting transition in these compounds.