Doping-dependent critical Cooper-pair momentum in thin underdoped cuprate films
John Draskovic, Stanley Steers, Thomas McJunkin, Adam Ahmed, Thomas R. Lemberger
DOI 10.1103/PhysRevB.91.104524 · Physical Review B
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Abstract
We apply a low-field (<100 G) technique to measure the critical pair momentum pc in thin underdoped films of Y0.7Ca0.3Ba2Cu3O7−δ and Bi2Sr2CaCu2O8+δ reflecting a wide range of hole doping. We observe that pc∝ℏ/ξ scales with Tc and therefore superfluid density ns(T→0) in our two-dimensional cuprate films. This relationship was famously predicted by a universal model of the cuprates with a doping-independent superconducting gap, but has not been observed by high field (>104G) measurements of the coherence length ξ because high-field cuprate phenomena obscure the simple scaling we observe at much lower fields.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.3 | Pressure not reported | unknown |
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.6 | Pressure not reported | unknown |
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | unknown |
| Y0.7Ca0.3Ba2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 59 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.9 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | unknown |
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