Identification of two critical charge carrier doping values in high-temperature Y0.8Ca0.2Ba2Cu3Ox and Sm2−xCexCuO4−y cuprate superconductors
B. J. Taylor, R. E. Baumbach, D. J. Scanderbeg, M. B. Maple
DOI 10.1103/PhysRevB.81.174511 · Physical Review B
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Abstract
Despite over two decades of intense scrutiny, much controversy surrounds many of the most prominent characteristic phenomena found in the high-Tc cuprate-based superconductors. These include the pseudogap, the presence or absence of charge/spin ordering at 1/8 doping, the evolution of the Fermi surface with charge doping, and the physics determining the magnetic field-temperature phase boundary between the electrically dissipationless and dissipative mixed states, Hg(T). From an analysis of the evolution of Hg(T) of thin-film samples of Y0.8Ca0.2Ba2Cu3Ox and Sm2−xCexCuO4−y with oxygen and Ce doping, respectively, we observe that the proximity to the doping state pc1=1/8 and to the putative quantum-critical point of the pseudogap pc2≈0.195 both have a quantifiable impact on the shape of Hg(T).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.8Ca0.2Ba2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | zero_resistance |
| Sm2-xCexCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | zero_resistance |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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