Doping Change in the Bi-2212 Superconductor Directly Induced by a Hard X-ray Nanobeam

作者：Pagliero Alessandro; Mino Lorenzo; Borfecchia Elisa; Truccato Marco^*; Agostino Angelo; Pascale Lise; Enrico Emanuele; De Leo Natascia; Lamberti Carlo; Martinez Criado Gema

来源：Nano Letters, 2014, 14(3): 1583-1589.

DOI：10.1021/n1404834u

• High-Temperature Superconductors
• Bi-2212
• single crystal
• doping
• nanolithography
• X-rays nanobeam
• whiskers

We describe the controlled use of a 17 keV X-ray synchrotron nanobeam to progressively change the oxygen doping level in Bi-2212 superconducting whisker-like single crystals. Our data combine structural and electrical information collected on the same crystals, showing a maximum change in the critical temperature T-c, of 1.3 K and a maximum elongation of similar to 1 A in the c-axis length, compared to the as-grown conditions. Simulations of our experimental conditions by means of a finite element model exclude local heating induced by the X-ray nanobeam as a possible cause for the change in the doping level and suggest an important role of secondary electrons. These findings support the possible use of hard X-rays as a novel direct-writing, photoresist-free lithographic process for the fabrication of superconducting devices, with potential nanometric resolution and 3D capability.

• 出版日期2014-3
• 单位中国计量科学研究院