Magnetic levitation, suspension, and superconductivity: Macroscopic and mesoscopic

Stephen B. Haley; Herman J. Fink

doi:10.1103/PhysRevB.53.3506

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Magnetic levitation, suspension, and superconductivity: Macroscopic and mesoscopic

Stephen B. Haley, Herman J. Fink

DOI 10.1103/PhysRevB.53.3506 · Physical Review B

T1

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Abstract

The levitation state of a large magnetic sphere held in equilibrium above a thick superconducting layer in the Meissner state is a single temperature-independent state as long as the maximum magnetic field at the superconducting (SC) surface does not exceed the critical field Hc(T). In contrast, a magnetic microsphere trapped by a superconducting microring exhibits very different behavior. When the radius b of the SC ring is of the same order as the Ginzburg-Landau coherence length ξ(T), the system exhibits, in general, a small set of distinct, quantized, temperature-dependent levitation and suspension states. For certain discrete values of b the flux in the ring is quantized, and the levitation and suspension heights are temperature independent. An abrupt temperature induced transition in the suspension height is also found for a special set of parameters. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown