Highly homogeneous YBCO/LSMO nanowires for photoresponse experiments

Abstract

By using nanolithography and a soft etching procedure, we have realized YBa 2 Cu 3 O 7−x /La 0.7 Sr 0.3 MnO 3 (YBCO/LSMO) nanowires, with cross sections down to 100 × 50 nm 2 that ensure the cover age of areas up to 10 × 30 µm 2 . The LSMO layer acts as a capping for YBCO, minimizing the degradation of the superconducting properties taking place during the patterning; moreover, as a ferromagnetic manganite, it is expected to accelerate the relaxation dynamics of quasiparticles in YBCO, making such a system potentially attractive for applications in superconducting ultrafast optoelectronics. The reproducibility of the values of the critical current densities measured in different devices with the same geometry makes our nanowires ideal candidates for photoresponse experiments. First measurements have shown a satisfactory photoresponse from YBCO/LSMO devices.

YBa 2 Cu 3 O 7−δ nanorings to probe fluxoid quantization in High Critical Temperature Superconductors

“…[15][16][17]. As a consequence of the soft ion milling procedure and of the presence of a Au capping layer on top of the nanowires, we have achieved YBCO nanostructures, demonstrating ''pristine'' superconducting properties, characterized by a critical current density close to the theoretical Ginzburg-Landau depairing limit [18].…”

Resistive state triggered by vortex entry in YBa 2 Cu 3 O 7−δ nanostructures

“…1(a)). Details of the nanofabrication process have been published elsewhere [14][15][16]. The resistance of the YBCO nanowires with various widths has been measured as a function of the temperature, in a temperature range around T C (see Fig.…”

Transport properties of ultrathin BaFe1.84Co0.16As2superconducting nanowires

“…The I-V of Ba122:Co nanowires shows flux-flow type behaviors which were also observed in the early YBa2Cu3O7-δ nanowires [25]. However, with the improvement of film quality and nanowire processing technology, the I-V flux-flow phenomenon has been almost eliminated in the highly uniform YBa2Cu3O7-δ and La1.85Sr0.15CuO4 nanowires [4,8].…”