Irreversibility line in Nb/CuMn multilayers with a regular array of antidots

TitleIrreversibility line in Nb/CuMn multilayers with a regular array of antidots
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2000
AuthorsAttanasio, C., Di Luccio Tiziana, Mercaldo L.V., Prischepa S.L., Russo R., Salvato M., Maritato L., Barbanera S., and Tuissi A.
JournalPhysical Review B - Condensed Matter and Materials Physics
KeywordsAnisotropy, article, electron beam, magnetic field, quantum mechanics, semiconductor, shear stress, Temperature measurement

The transport properties of superconducting multilayers with a regular array of antidots obtained by electron-beam lithography have been measured at different temperatures in the presence of external perpendicular magnetic fields. Hysteresis in the I-V characteristics was observed, which disappears when approaching the upper critical magnetic field curve Hc2(T). By comparing these data with other results (Arrhenius plots of resistive transition curves, log V-log 1 characteristics) we have been able to relate the onset of the hysteresis to the presence of an irreversibility line. We discuss several possible mechanisms to clarify the nature of this line. Among them the most plausible seems to be vortex melting mainly induced by quantum fluctuations.


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