Irreversibility Line in Nb/CuMn Multilayers with a Regular Array of Antidots

Details Irreversibility Line in Nb/CuMn Multilayers with a Regular Array of Antidots Irreversibility Line in Nb/CuMn Multilayers with a Regular Array of Antidots

2000-01-14

arxiv.org/abs/cond-mat/0001205v1

Physics

Condensed Matter

Superconductivity

8 pages, 11 eps figures, 1 eps table, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.62.14461

The transport properties of Nb/CuMn multilayers with a regular array of electron beam lithography obtained antidots have been measured at different temperatures in the presence of external perpendicular magnetic fields. Hysteretical I-V characteristics have been observed which disappear when approaching the upper critical magnetic field curve H_{c2}(T). Comparing these data with other results (Arrhenius plots of resistive transition curves, logV-logI 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 the vortex melting mainly induced by quantum fluctuations.

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