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Reentrance of the induced diamagnetism in gold-niobium proximity cylinders

F. Bernd Mueller-Allinger·Ana Celia Mota
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Abstract

We discuss the magnetic response of gold-niobium proximity cylinders in the temperature range 100 μK<T<9 K. The temperature dependence of the susceptibility in the diamagnetic regime is described well by the quasiclassical Eilenberger theory including an elastic mean-free path l. In the mesoscopic regime, the temperature dependence of the reentrant paramagnetic susceptibility χ_para(T) \propto \exp[-L/3ξ^d_N(T)] is governed by the dirty limit coherence length ξ^d_N(T)=\sqrt{1/3ξ_N l_N}, with ξ_N the clean limit coherence length obtained from breakdown field measurements and l_N the measured mean-free path in the gold layer. At T=100 μK, χ_para compensates about 1/5 of the induced diamagnetic susceptibility in gold.

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F. Bernd Mueller-Allinger, Ana Celia Mota. 2000-07-21. Reentrance of the induced diamagnetism in gold-niobium proximity cylinders. https://arxiv.org/abs/cond-mat/0007331

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