TY - JOUR

T1 - Reentrant resistive behavior and dimensional crossover in disordered superconducting TiN films

AU - Postolova, Svetlana V.

AU - Mironov, Alexey Yu

AU - Baklanov, Mikhail R.

AU - Vinokur, Valerii M.

AU - Baturina, Tatyana I.

PY - 2017/5/11

Y1 - 2017/5/11

N2 - 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.

AB - 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.

KW - CRITICAL-FIELD

KW - DEPENDENCE

KW - INSULATOR-TRANSITION

KW - NORMAL-STATE

KW - PSEUDOGAP

KW - SURFACE

KW - TEMPERATURE

KW - THIN-FILMS

KW - TRANSPORT-PROPERTIES

UR - http://www.scopus.com/inward/record.url?scp=85019254892&partnerID=8YFLogxK

U2 - 10.1038/s41598-017-01753-w

DO - 10.1038/s41598-017-01753-w

M3 - Article

C2 - 28496099

AN - SCOPUS:85019254892

VL - 7

SP - 1718

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

IS - 1

M1 - 1718

ER -