Doubling of the critical temperature of FeSe observed in point contacts

Abstract

Rise in superconducting critical temperature Tc more than two times (exceeding 20 K) is discov- ered in point-contacts created between iron-chalcogenide FeSe single crystal and Cu. The possible reasons of such Tc increase in point-contacts are discussed. The most probable cause for this may be the interfacial carriers doping and/or interfacial enhanced electron-phonon interaction.

4 pages, 3 Figs. V2: two Refs. added, Fig.3 updated

References in corpus (6)

• Superconductivity in single-layer films of FeSe with a transition temperature above 100 K
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Phase-incoherent superconducting pairs in the normal state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Analysis of nonlinear conductivity of point contacts on the base of FeSe in the normal and superconducting state

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• s+is superconductivity with incipient bands: doping dependence and STM signatures
• Proximity and Josephson effects in microstructures based on multiband superconductors
• Gossamer bulk high-temperature superconductivity in FeSe
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Conductivity of anisotropic inhomogeneous superconductors above critical temperature
• The superconducting gaps in FeSe studied by soft point-contact Andreev reflection spectroscopy
• Anisotropic zero-resistance onset in organic superconductors
• Tip-induced Superconductivity
• Inhomogeneous superconductivity onset in FeSe studied by transport properties
• Giant Enhancement of Superconductivity in Zr Point Contacts
• Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc
• Self-consistent and Maxwell approximations to describe the excess conductivity anisotropy in FeSe above superconducting transition temperature
• Enhanced critical temperatures in the strongly overdoped iron-based superconductors AFe${}_2$As${}_2$ (A = K, Cs, Rb) observed by point contacts
• Sub-kelvin Andreev reflection spectroscopy of superconducting gaps in FeSe