Relaxation effects in the transition temperature of superconducting HgBa2CuO4+δ
S. Sadewasser, J. S. Schilling, J. L. Wagner, O. Chmaissem, J. D. Jorgensen, D. G. Hinks, B. Dabrowski
DOI 10.1103/PhysRevB.60.9827 · 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
In previous studies on a number of underdoped and overdoped high-temperature superconductors, including YBa2Cu3O7−y and Tl2Ba2CuO6+δ, the transition temperature Tc has been found to change with time in a manner which depends on the sample’s detailed temperature and pressure history. This relaxation behavior in Tc is believed to originate from rearrangements within the oxygen sublattice. In the present high-pressure studies on HgBa2CuO4+δ to 0.8 GPa we find clear evidence for weak relaxation effects in strongly underdoped and overdoped samples (Tc≃40–50K) with an activation energy EA(1bar)≃0.8–0.9eV. For overdoped HgBa2CuO4+δ EA increases under pressure more rapidly than previously observed for YBa2Cu3O6.41, yielding an activation volume of +11±5cm3; the dependence of Tc on pressure is markedly nonlinear, an anomalous result for high-Tc superconductors in the present pressure range, giving evidence for a change in the electronic and/or structural properties near 0.4 GPa.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure unresolved | onset |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 47.81 | Pressure unresolved | onset |
| HgBa2CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 47.55 | Pressure unresolved | onset |
| HgBa2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 98 | Pressure unresolved | unknown |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | Pressure unresolved | unknown |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 164 | 30 GPa | unknown |
Similar papers
Superconducting properties of grain-aligned HgBa2CuO4+x
similarity 0.97J. A. Lewis et al.
Source status unknown — claims are unverified
Volume dependence of the superconducting transition temperature for the high-temperature superconductor HgBa2Ca2−xPbxCu3O8+δ
similarity 0.97Charles C. Kim et al.
Source status unknown — claims are unverified
Doping-induced charge redistribution in the high-temperature superconductor HgBa2CuO4+δ
similarity 0.96C. Ambrosch-Draxl et al.
Source status unknown — claims are unverified
Nanoscale structural correlations in a model cuprate superconductor
similarity 0.96Zachary W. Anderson et al.
Source status unknown — claims are unverified
Transition temperature and a spatial dependence of the superconducting gap for multilayer high-temperature superconductors
similarity 0.96Krzysztof Byczuk & Jozef Spałek
Source status unknown — claims are unverified
Defect chemistry and oxygen diffusion in the HgBa2Ca2Cu3O8+δ superconductor: A computer simulation study
similarity 0.96M. S. Islam & L. J. Winch
Source status unknown — claims are unverified