Transport properties in FeSe0.5Te0.5 nanobridges

Wu, C. H.; Chang, W. C.; Jeng, J. T.; Wang, M. J.; Li, Y. S.; Chang, H. H.; Wu, M. K.
June 2013
Applied Physics Letters;6/3/2013, Vol. 102 Issue 22, p222602
Academic Journal
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.


Related Articles

  • Josephson currents in point contacts between dirty two-band superconductors. Yerin, Y. S.; Omelyanchouk, A. N. // Low Temperature Physics;Oct2010, Vol. 36 Issue 10, p969 

    We develop a microscopic theory of the Josephson effect in point contacts between dirty two-band superconductors. A general expression for the Josephson current, which is valid for arbitrary temperatures, is obtained. This formula is used to calculate the current-phase relations and temperature...

  • Current-phase relation for a superconducting point contact with a tunneling barrier. Gogadze, G.A. // Low Temperature Physics;Sep98, Vol. 24 Issue 9, p685 

    Presents a microscopic theory of the de Josephson effect for a short clean superconducting point contact with a tunnel barrier. Influence of the ordinary quasiparticle scattering on the nondiagonal potential delta of the superconductor; Calculation of the current-phase relation for a point...

  • Cooper pair wavefunction approach to the Josephson effect. Kim, Yong-Jihn // Journal of Applied Physics;May2008, Vol. 103 Issue 10, p103902 

    We introduce an approach to the Josephson effect in the superconductor-insulator-superconductor (SIS) tunnel junctions. The Josephson coupling energy is calculated from the overlap of real space Cooper pair wavefunctions in two superconductors through an insulating barrier. It is shown that the...

  • Josephson effect between superconducting nanograins with discrete energy levels. Gobert, D.; Schollwöck, U.; Von Delft, J. // European Physical Journal B -- Condensed Matter;Apr2004, Vol. 38 Issue 3, p501 

    We investigate the Josephson effect between two coupled superconductors, coupled by the tunneling of pairs of electrons, in the regime that their energy level spacing is comparable to the bulk superconducting gap, but neglecting any charging effects. In this regime, BCS theory is not valid, and...

  • Origin of the spin-triplet Andreev reflection at ferromagnet/s-wave superconductor interface. Feng, Cui Di; Zheng, Zhi Ming; Ji, Yi Qun; Niu, Zhi Ping; Xing, D. Y. // Journal of Applied Physics;Jan2008, Vol. 103 Issue 2, p023921 

    To understand the origin of the spin-triplet Andreev reflection which may appear at a ferromagnet (F)/s-wave superconductor (S) interface, we study tunneling conductance spectra of F/2DEG/s-wave S tunnel junctions, with 2DEG the two-dimensional electron gas with Rashba spin-orbit coupling and...

  • On the 50th anniversary of the Josephson effects. Balkashin, O. P. // Low Temperature Physics;Apr2012, Vol. 38 Issue 4, p259 

    No abstract available.

  • Characterization of Submicron Sized Josephson Junction Fabricated in a Bi2Sr2Ca2Cu3O10+ δ (Bi-2223) Single Crystal Whisker. Saini, S.; Kim, G. S.; Kim, S.-J. // Journal of Superconductivity & Novel Magnetism;Jul2010, Vol. 23 Issue 5, p811 

    To study the detailed characteristics of a nano-periodic Josephson junction array in a Bi2Sr2Ca2Cu3O10+ δ (Bi-2223) single crystal whisker without shunted grain boundaries, we fabricate a submicron stack with an area of 0.5 μm×0.5 μm and height of approximately 200 nm using a...

  • High Tc superconducting quantum interference devices made by ion irradiation. Bergeal, N.; Lesueur, J.; Faini, G.; Aprili, M.; Contour, J. P. // Applied Physics Letters;9/11/2006, Vol. 89 Issue 11, p112515 

    The authors describe a method to make superconducting quantum interference devices (SQUIDs) formed in a single layer of high Tc superconducting materials. The superconducting loop is patterned using ion beam irradiation through an in situ suitable gold mask. Josephson junctions are defined by a...

  • High quality ferromagnetic 0 and Ï€ Josephson tunnel junctions. Weides, M.; Kemmler, M.; Goldobin, E.; Koelle, D.; Kleiner, R.; Kohlstedt, H.; Buzdin, A. // Applied Physics Letters;9/18/2006, Vol. 89 Issue 12, p122511 

    The authors fabricated high quality Nb/Al2O3/Ni0.6Cu0.4/Nb superconductor-insulatorferromagnet-superconductor Josephson tunnel junctions. Depending on the thickness of the ferromagnetic Ni0.6Cu0.4 layer and on the ambient temperature, the junctions were in the 0 or π ground state. All...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics