Dimensional crossover in the low-temperature transport properties of annealed amorphous Fe/Si multilayers

Lin, Yeong Kuo; Novet, Thomas; Johnson, David C.; Valles, James M.

doi:10.1103/physrevb.48.14608

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Since in high- T c the conductivity along the layers is much greater than that across the layers, the electrons there can be viewed as confined to individual layers 41 . Therefore, the corresponding quantum contributions are described by the same Eqs ( 5 ) and ( 6 ) butwith 42 . As for the fluctuation phenomena, the superconducting fluctuations above T c are prominently present in high- T c compounds because of their extreme anisotropy 43 , 44 .…”

Section: Discussionmentioning

confidence: 99%

Reentrant Resistive Behavior and Dimensional Crossover in Disordered Superconducting TiN Films

Postolova

Mironov

Baklanov

et al. 2017

Sci Rep

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A reentrant temperature dependence of the normal state resistance often referred to as the N-shaped temperature dependence, is omnipresent in disordered superconductors – ranging from high-temperature cuprates to ultrathin superconducting films – that experience superconductor-to-insulator transition. Yet, despite the ubiquity of this phenomenon its origin still remains a subject of debate. Here we investigate strongly disordered superconducting TiN films and demonstrate universality of the reentrant behavior. We offer a quantitative description of the N-shaped resistance curve. We show that upon cooling down the resistance first decreases linearly with temperature and then passes through the minimum that marks the 3D–2D crossover in the system. In the 2D temperature range the resistance first grows with decreasing temperature due to quantum contributions and eventually drops to zero as the system falls into a superconducting state. Our findings demonstrate the prime importance of disorder in dimensional crossover effects.

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