论文信息 - Transport properties in FeSe0.5Te0.5 nanobridges

Transport properties in FeSe0.5Te0.5 nanobridges

FeSeTe nanobridges of different widths have been fabricated on MgO substrates using focused ion beams. These nanobridges exhibit the Josephson effects. The current-voltage curves of junctions with 248–564 nm wide follow the resistively and capacitatively shunted junction model. Shapiro steps under microwave radiation were clearly observed in these nanobridges. The products of the critical current and normal state resistance (IcRn) are remarkably high. The temperature dependence of IcRn product followed the Ambegaokar-Baratoff (A-B) relation. The value of energy gap of FeSeTe calculated from the A-B relation is 3.5kBTc. The nanobridge junctions have a strong potential for high frequency applications.

[1] I. Mönch,et al. Edge-type Josephson junctions with Co-doped Ba-122 thin films , 2012 .

[2] M. Blamire,et al. Spin-filter Josephson junctions. , 2011, Nature materials.

[3] P. Seidel. Josephson effects in iron based superconductors , 2011 .

[4] K. Tanabe,et al. Advantageous grain boundaries in iron pnictide superconductors , 2010, Nature communications.

[5] M. Inoue,et al. A trial of Fe(Se1-xTex) thin film fabrication by pulsed laser deposition using ArF excimer laser , 2010 .

[6] Chii-Ming Wu,et al. Heterojunction of Fe(Se1−xTex) superconductor on Nb-doped SrTiO3 , 2010 .

[7] H. Sakata,et al. Local density of states and superconducting gap in the iron chalcogenide superconductor Fe$_{1+δ}$Se$_{1-x}$Te$_{x}$ observed by scanning tunneling spectroscopy , 2009, 0910.1485.

[8] K. Yeh,et al. Superconducting FeSe1−xTex Single Crystals Grown by Optical Zone-Melting Technique , 2009, 0908.2855.

[9] F. Hsu,et al. Pressure Effects on Superconductivity and Magnetism in FeSe1-xTex , 2009 .

[10] A. Sefat,et al. Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x , 2009, 0902.1519.

[11] Jiangping Hu,et al. First-order magnetic and structural phase transitions in Fe1+ySexTe1-x , 2008, 0811.0195.

[12] Vinay Ambegaokar,et al. Tunneling between superconductors , 1963 .

[13] K. Tanabe,et al. Frontiers of Research on Iron-Based Superconductors toward Their Application , 2011 .