Ablation laser fluence as an effective parameter to control superconductivity in Ba1−xKxBiO3 films

• Published in: Current applied physics Vol. 17; no. 5; pp. 600 - 604
• Main Authors: Lee, Hodong, Kim, Minu, Korneta, O.B., Lee, Shinbuhm, Noh, Tae Won
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.05.2017; 한국물리학회
• Subjects: Laser fluence; Perovskite oxide thin film; Pulsed laser deposition; Superconductivity; 물리학; Pulsed laser deposition; Perovskite oxide thin film; Laser fluence; Superconductivity
• ISSN: 1567-1739; 1878-1675
• DOI: 10.1016/j.cap.2017.02.014

Potassium doping in insulating BaBiO3 induces superconductivity, with high superconducting transition temperatures, Tc, of up to 31 K in bulk. We investigated growth control of superconducting properties of BKBO films, by varying laser fluence using pulsed laser deposition technique. As cation stoichiometry, especially potassium concentration in BKBO films, was sensitively changed with laser fluence, we were able to precisely control Tc of BKBO films. Following the trend of the bulk phase diagram, Tc showed the highest value of 24.5 ± 0.5 K at the optimal stoichiometry. This result can provide optimal guidance for the synthesis of high-quality BKBO films, and demonstrates the effectiveness of laser fluence to study emerging superconducting phenomena in PLD-grown complex oxide thin films. •Growth control of superconducting Ba1−xKxBiO3 films by pulsed laser deposition.•Ablation laser fluence varies cation stoichiometry, especially potassium density.•The variation in the film stoichiometry leads to lattice contraction by 1.1%.•Superconducting Tc is controlled from zero to 24.5 K by adjusting the fluence.