Experimental evidence for giant vortex states in a mesoscopic superconducting disk.
نویسندگان
چکیده
The response of a mesoscopic superconducting disk to perpendicular magnetic fields is studied by using the multiple-small-tunnel-junction method, in which transport properties of several small tunnel junctions attached to the disk are measured simultaneously. This allows us to make the first experimental distinction between the giant vortex states and multivortex states. Moreover, we experimentally find a magnetic-field induced rearrangement and combination of vortices. The experimental results are well reproduced in numerical results based on the nonlinear Ginzburg-Landau theory.
منابع مشابه
Vortex Matter in Mesoscopic Superconducting Disks and Rings
Phase transitions between different (i.e. giant and multi-vortex) superconducting states and between the superconducting-normal state of mesoscopic disks and rings are studied in the presence of an external magnetic field by solving the two non-linear Ginzburg-Landau equations self-consistently. The flux through a circular disk with a hole in the middle is not quantized.
متن کاملO ct 1 99 9 Transitions between different superconducting states in mesoscopic disks
Using a linear analysis, we study the stability of giant–vortex states in very thin disks. The vortex expulsion and penetration fields are obtained for finite thickness disks from a numerical solution of the non-linear Ginzburg–Landau (GL) equations. Using an extension of the London approximation, in which the phase distribution of the order parameter is prescribed and the superconducting elect...
متن کاملAnnular Vortex Solutions to the Landau-Ginzburg Equations in Mesoscopic Superconductors
New vortex solutions to the Landau-Ginzburg equations are described. These configurations, which extend the well known Abrikosov and giant magnetic vortex ones, consist of a succession of ring-like supercurrent vortices organised in a concentric pattern, possibly bound to a giant magnetic vortex then lying at their center. The dynamical and thermodynamic stability of these annular vortices is a...
متن کاملDimensional crossover in a mesoscopic superconducting loop of finite width
Superconducting structures with the size of the order of the superconducting coherence length ξ(T ) have a critical temperature Tc, oscillating as a function of the applied perpendicular magnetic field H (or flux Φ). For a thin-wire superconducting loop, the oscillations in Tc are perfectly periodic with H (this is the well-known Little-Parks effect), while for a singly connected superconductin...
متن کاملPinning-induced formation of vortex clusters and giant vortices in mesoscopic superconducting disks.
Merged, or giant, multiquanta vortices (GVs) are known to appear in very small superconductors near the superconducting transition due to strong confinement of magnetic flux. Here we present evidence for a new, pinning-related, mechanism for vortex merger. Using Bitter decoration to visualize vortices in small Nb disks with varying degrees of disorder, we show that confinement in combination wi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Physical review letters
دوره 93 25 شماره
صفحات -
تاریخ انتشار 2004