Doubling of the critical temperature of FeSe observed in point contacts
  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. 
Yu.G. Naidyuk, G. Fuchs, D.A. Chareev, and A.N. Vasiliev
cond-mat.supr-con