Positron-annihilation studies of the superconductivity transition in YBa2Cu3O7−x
L. C. Smedskjaer, B. W. Veal, D. G. Legnini, A. P. Paulikas, L. J. Nowicki
DOI 10.1103/PhysRevB.37.2330 · 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
Positron-annihilation studies, by Doppler broadening, of the superconducting transition in YBa2Cu3O7−x(x≊0.1) have been made. Below Tc a large positive temperature dependence of the lineshape parameter is observed, while at (or near) Tc an almost discontinuous increase in the lineshape parameter takes place. The behavior below Tc may be consistent with a Bardeen-Cooper-Schrieffer-like theory if an energy band with a small dispersion crosses the Fermi level. The discontinuity is not clearly understood, but may be due to a major change in the electronic structure taking place with the onset of superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | midpoint |
| YBa2Cu3O6.9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | midpoint |
Similar papers
Electronic excitations of the YBa2Cu3O7−x superconductor: A study by transmission electron-energy-loss spectroscopy with an electron microprobe
similarity 0.94C. H. Chen et al.
Source status unknown — claims are unverified
Ultrasonic studies of the relation between two-level-tunneling systems, oxygen content, and superconducting transition temperature in YBa2Cu3O7−δ
similarity 0.94A. Hikata et al.
Source status unknown — claims are unverified
Antiferromagnetism and superconductivity in oxygen-deficient YBa2Cu3Ox
similarity 0.94J. H. Brewer et al.
Source status unknown — claims are unverified
Search for Isotope Effect in Superconducting Y-Ba-Cu-O
similarity 0.94L. C. Bourne et al.
Source status unknown — claims are unverified
Carrier-relaxation dynamics in intragap states: The case of the superconductor YBa2Cu3O7−δ and the charge-density-wave semiconductor K0.3MoO3
similarity 0.94V. V. Kabanov et al.
Source status unknown — claims are unverified
Dispersion of Magnetic Excitations in Optimally Doped Superconducting YBa2Cu3O6.95
similarity 0.94D. Reznik et al.
Source status unknown — claims are unverified