Critical temperature oscillations in magnetically coupled superconducting mesoscopic loops

Details Critical temperature oscillations in magnetically coupled superconducting mesoscopic loops Critical temperature oscillations in magnetically coupled superconducting mesoscopic loops

2001-05-23

arxiv.org/abs/cond-mat/0105454v1

Phys. Rev. B 64, 064516 (2001)

Physics

Condensed Matter

Superconductivity

9 pages, 7 figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.64.064516

We study the magnetic interaction between two superconducting concentric mesoscopic Al loops, close to the superconducting/normal phase transition. The phase boundary is measured resistively for the two-loop structure as well as for a reference single loop. In both systems Little-Parks oscillations, periodic in field are observed in the critical temperature Tc versus applied magnetic field H. In the Fourier spectrum of the Tc(H) oscillations, a weak 'low frequency' response shows up, which can be attributed to the inner loop supercurrent magnetic coupling to the flux of the outer loop. The amplitude of this effect can be tuned by varying the applied transport current.

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