Approaching Two-Dimensional Superconductivity in Ultrathin DyBa2Cu3O7−δ
R. D. Dawson, K. S. Rabinovich, D. Putzky, G. Christiani, G. Logvenov, B. Keimer, A. V. Boris
DOI 10.1103/PhysRevLett.125.237001 · Physical Review Letters
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 temperature dependence of the superfluid density ρs(T) has been measured for a series of ultrathin MBE-grown DyBa2Cu3O7−δ superconducting (SC) films by submillimeter wave interferometry combined with time-domain terahertz spectroscopy and IR ellipsometry. We find that all films 10 u.c. and thicker show the same universal temperature dependence of ρs(T), which follows the critical behavior characteristic of single crystal YBa2Cu3O7−δ as T approaches Tc. In 7 u.c. thick films, ρs(T) declines steeply upon approaching Tc, as expected for the Berezinskii-Kosterlitz-Thouless vortex unbinding transition. Our analysis provides evidence for a sharply defined 4 u.c. non-SC interfacial layer, leaving a quasi-2D SC layer on top. We propose that the SC state in this interfacial layer is suppressed by competing (possibly charge) order.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 72 | Pressure not reported | unknown |
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52 | Pressure not reported | unknown |
Similar papers
X-ray-diffraction studies of Dy1.1Ba1.9Cu3O7−δ(001) and Dy1.3Ba1.7Cu3Oy(001) high-temperature-superconductor thin films
similarity 0.95K. M. Choudhary et al.
Source status unknown — claims are unverified
Y-Ba-Cu-O/Dy-Ba-Cu-O superlattices: A first step towards the artificial construction of high-Tc superconductors
similarity 0.95J.-M. Triscone et al.
Source status unknown — claims are unverified
Spatial dichotomy of quasiparticle dynamics in underdoped thin-film YBa2Cu3O7−δ superconductors
similarity 0.94C. W. Luo et al.
Source status unknown — claims are unverified
Quasiparticle relaxation dynamics in superconductors with different gap structures: Theory and experiments on YBa2Cu3O7−δ
similarity 0.94V. V. Kabanov et al.
Source status unknown — claims are unverified
Comparative study of superconducting energy gaps in oriented films and polycrystalline bulk samples of Y-Ba-Cu-O
similarity 0.93R. T. Collins et al.
Source status unknown — claims are unverified
Low-field dependence of the microwave absorption in superconducting YBa2Cu3O7−x near Tc
similarity 0.93R. Karim et al.
Source status unknown — claims are unverified