Paraconductivity of underdoped La2−xSrxCuO4 thin-film superconductors using high magnetic fields
B. Leridon, J. Vanacken, T. Wambecq, V. V. Moshchalkov
DOI 10.1103/PhysRevB.76.012503 · 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
The contribution of superconducting fluctuations to the conductivity, or paraconductivity, is studied in the underdoped regime of La2−xSrxCuO4 cuprates. A perpendicular magnetic field up to 50T is applied to suppress the superconductivity and obtain the normal state resistivity, which is then used to calculate the paraconductivity. Surprisingly enough, it is consistent with a two-dimensional Aslamazov-Larkin regime of Gaussian fluctuations close to the critical temperature. At higher temperature, the paraconductivity exhibits a power-law decrease in temperature (as T−α), as was previously shown for underdoped YBa2Cu3O7−δ and Bi2Sr2CaCu2O8+δ samples. Our observations are not consistent with the existence of Kosterlitz-Thouless fluctuations. This tends to indicate that the superconducting pair amplitude is not already defined above TC in the pseudogap state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Band-theory analysis of anisotropic transport in La2CuO4-based superconductors
similarity 0.97Philip B. Allen et al.
Source status unknown — claims are unverified
In-plane paraconductivity in La2−xSrxCuO4 thin film superconductors at high reduced temperatures: Independence of the normal-state pseudogap
similarity 0.96Severiano R. Currás et al.
Source status unknown — claims are unverified
Weak magnetism in insulating and superconducting cuprates
similarity 0.96G. M. De Luca et al.
Source status unknown — claims are unverified
Universal behavior of the in-plane paraconductivity of cuprate superconductors in the short-wavelength fluctuation regime
similarity 0.96J. Viña et al.
Source status unknown — claims are unverified
Co-deposition growth and superconductivity of La2−xSrxCuO4 films by reactive molecular beam epitaxy
similarity 0.95Yang Wang et al.
Source status unknown — claims are unverified
Optimal superconductivity in La2−xSrxCuO4
similarity 0.95J.-S. Zhou et al.
Source status unknown — claims are unverified