Reentrant Resistive Behavior and Dimensional Crossover in Disordered Superconducting TiN Films

Scientific Reports
Svetlana V PostolovaTatyana I Baturina

Abstract

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.

References

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Citations

Nov 13, 2018·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A Yu MironovT I Baturina
Sep 22, 2018·Scientific Reports·Lei QiaoBaruch Rosenstein
Feb 1, 2020·Scientific Reports·M V BurdastyhA Yu Mironov
Mar 23, 2021·Advanced Materials·Ivan A TroyanArtem R Oganov

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Methods Mentioned

BETA
electron-electron scattering
electron-phonon scattering

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