Strong- versus weak-coupling paradigms for cuprate superconductivity
Shahaf Asban, Meni Shay, Muntaser Naamneh, Tal Kirzhner, Amit Keren
DOI 10.1103/PhysRevB.88.060502 · Physical Review B
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Abstract
Absolute resistivity measurements as a function of temperature from optimally doped YBa2Cu3O7−δ, La2−xSrxCuO4, Bi2Sr2Ca1Cu2O8−x, and (Ca0.1La0.9)(Ba1.65La0.35)Cu3Oy thin films are reported. Special attention is given to the measurement geometrical factors and the resistivity slope between Tc and T*. The results are compared with a strong-coupling theory for the resistivity derivative near Tc, which is based on hard core bosons, and with several weak-coupling theories, which are BCS based. Surprisingly, our results agree with both paradigms. The implications of these findings and the missing calculations needed to distinguish between the two paradigms are discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 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 |
| Bi2Sr2Ca1Cu2O8-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| (Ca0.1La0.9)(Ba1.65La0.35)Cu3Oy 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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