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Keppert, Sandra
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article
Phase purity and surface morphology of high-Jc superconducting Bi2Sr2Ca1Cu2O8+δ thin films
Abstract
Bi<sub>2</sub>Sr<sub>2</sub>Ca<sub>1</sub>Cu<sub>2</sub>O<sub>8+δ</sub> (Bi-2212) thin films with thicknesses less than 50 nm (<20 unit cells) are grown by pulsed laser deposition (PLD) onto (001) LaAlO<sub>3</sub> (LAO) single crystal substrates. Phase-pure and smooth c-axis oriented Bi-2212 films with optimal oxygen doping, critical temperature <i>T</i><sub>c0</sub> up to 86 K, and critical current density <i>J</i><sub>c</sub>(60 K) above 1 MA/cm<sup>2</sup> are obtained for samples that are annealed in situ at temperatures below 700 °C. At higher temperature Bi-2212 films on LAO substrates partially decompose to non-superconducting impurity<br/>phases, while films on MgO and SrTiO<sub>3</sub> substrates are stable. The broadening Δ<i>T</i><sub>c</sub> of the metal-to-superconductor resistive phase transition in magnetic fields is much larger for thin films of Bi-2212 as compared to YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>. The magnetic field-induced suppression of <i>T</i><sub>c0</sub> is stronger for Bi-2212 films containing impurity phases as compared to the phase-pure Bi-2212 films. The degradation of LAO substrate crystals after several steps of deposition and chemical removal of the Bi-2212 layer is investigated. New, commercially prepared substrates<br/>provide Bi-2212 films with smallest surface roughness (3 nm) and strong out-of-plane texture. However, thin films of almost the same quality are obtained on re-used LAO substrates that are mechanically polished after the chemical etching.