TY - JOUR

T1 - Quantum contributions to the magnetoconductivity of critically disordered superconducting TiN films

AU - Mironov, A. Yu

AU - Postolova, S. V.

AU - Baturina, T. I.

PY - 2018/11/12

Y1 - 2018/11/12

N2 - The onset of superconductivity in the presence of disorder is a fundamental problem of condensed matter physics. Here we investigate the magnetoconductance of disordered (8 > kFl > 1.8) superconducting TiN films above the critical temperature Tc. We show that the magnetoconductivity of moderately disordered films with kFl > 5 is in full agreement with the perturbative theory of quantum contributions to conductivity. We demonstrate that the magnetoconductivity of films with kFl ≲ 5 is also in agreement with the perturbative theory down to temperatures T ≈ 2Tc . The quantitative discrepancy between experiment and theory develops only below temperatures T - 2Tc for films with kFl ≈ 5. This discrepancy can be eliminated if we assume steeper temperature dependence of the Larkin's electron'electron attraction strength, Β(T/Tc). The obtained temperature dependence of electron phase breaking time τ (T/Tc) is in agreement with theoretical predictions for all samples.

AB - The onset of superconductivity in the presence of disorder is a fundamental problem of condensed matter physics. Here we investigate the magnetoconductance of disordered (8 > kFl > 1.8) superconducting TiN films above the critical temperature Tc. We show that the magnetoconductivity of moderately disordered films with kFl > 5 is in full agreement with the perturbative theory of quantum contributions to conductivity. We demonstrate that the magnetoconductivity of films with kFl ≲ 5 is also in agreement with the perturbative theory down to temperatures T ≈ 2Tc . The quantitative discrepancy between experiment and theory develops only below temperatures T - 2Tc for films with kFl ≈ 5. This discrepancy can be eliminated if we assume steeper temperature dependence of the Larkin's electron'electron attraction strength, Β(T/Tc). The obtained temperature dependence of electron phase breaking time τ (T/Tc) is in agreement with theoretical predictions for all samples.

KW - quantum corrections to conductivity

KW - superconductor-insulator transition

KW - two-dimensional superconductor

KW - INELASTIC-SCATTERING

KW - ALUMINUM FILMS

KW - DEPENDENCE

KW - FLUCTUATION

KW - TRANSITION

KW - TRANSPORT

KW - WEAK-LOCALIZATION

KW - TEMPERATURE

KW - RESISTANCE

KW - PARAMETER

UR - http://www.scopus.com/inward/record.url?scp=85056502987&partnerID=8YFLogxK

U2 - 10.1088/1361-648X/aae870

DO - 10.1088/1361-648X/aae870

M3 - Article

C2 - 30418946

AN - SCOPUS:85056502987

VL - 30

SP - 485601

JO - Journal of Physics Condensed Matter

JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 48

M1 - 485601

ER -