Paramagnetic reentrant effect in high purity mesoscopic AgNb proximity structures

Details Paramagnetic reentrant effect in high purity mesoscopic AgNb proximity structures Paramagnetic reentrant effect in high purity mesoscopic AgNb proximity structures

1999-04-23

arxiv.org/abs/cond-mat/9904344v4

Phys.Rev.Lett. 84, 3161 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures (color)

Scientific paper

10.1103/PhysRevLett.84.3161

We discuss the magnetic response of clean Ag coated Nb proximity cylinders in the temperature range 150 \mu K < T < 9 K. In the mesoscopic temperature regime, the normal metal-superconductor system shows the yet unexplained paramagnetic reentrant effect, discovered some years ago [P. Visani, A. C. Mota, and A. Pollini, Phys. Rev. Lett. 65, 1514 (1990)], superimposing on full Meissner screening. The logarithmic slope of the reentrant paramagnetic susceptibility chi_para(T) \propto \exp(-L/\xi_N) is limited by the condition \xi_N=n L, with \xi_N=\hbar v_F/2 \pi k_B T, the thermal coherence length and n=1,2,4. In wires with perimeters L=72 \mu m and L=130 \mu m, we observe integer multiples n=1,2,4. At the lowest temperatures, \chi_para compensates the diamagnetic susceptibility of the \textit{whole} AgNb structure.

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