Broadening of the Berezinskii-Kosterlitz-Thouless superconducting transition by inhomogeneity and finite-size effects
L. Benfatto, C. Castellani, T. Giamarchi
DOI 10.1103/PhysRevB.80.214506 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We discuss the crucial role played by finite-size effects and inhomogeneity on the Berezinskii-Kosterlitz-Thouless (BKT) transition in two-dimensional superconductors. In particular, we focus on the temperature dependence of the resistivity, that is dominated by superconducting fluctuations above the BKT transition temperature TBKT and by inhomogeneity below it. By means of a renormalization-group approach we establish a direct correspondence between the parameter values used to describe the BKT fluctuation regime and the distance between TBKT and the mean-field Ginzburg-Landau transition temperature. Below TBKT a resistive tail arises due to finite-size effects and inhomogeneity, that reflects also on the temperature dependence of the superfluid density. We apply our results to recent experimental data in superconducting LaAlO3/SrTiO3 heterostructures, and we extract several informations on the microscopic properties of the system from our BKT fitting parameters. Finally, we compare our approach to recent data analysis presented in the literature, where the physical meaning of the parameter values in the BKT formulas has been often overlooked.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaAlO3/SrTiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| InOx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| NbSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TiN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Robustness of the Berezinskii-Kosterlitz-Thouless transition in ultrathin NbN films near the superconductor-insulator transition
similarity 0.96Jie Yong et al.
Source status unknown — claims are unverified
Magnetic field tuned superconductor-to-insulator transition at the LaAlO3/SrTiO3 interface
similarity 0.93M. M. Mehta et al.
Source status unknown — claims are unverified
Multiband superconductivity and nanoscale inhomogeneity at oxide interfaces
similarity 0.93S. Caprara et al.
Source status unknown — claims are unverified
Correlation between superconductivity, band filling, and electron confinement at the LaAlO3/SrTiO3 interface
similarity 0.93A. E. M. Smink et al.
Source status unknown — claims are unverified
Paraconductivity of pseudogapped superconductors
similarity 0.93Igor Poboiko & Mikhail Feigel'man
Source status unknown — claims are unverified
Magnetoresistance in the superconducting state at the (111) LaAlO3/SrTiO3 interface
similarity 0.92S. Davis et al.
Source status unknown — claims are unverified