Ground-state interplane superconducting coherence length of La1.875Sr0.125CuO4
Itay Mangel, Amit Keren
DOI 10.1103/PhysRevB.109.094519 · Physical Review B
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Abstract
A long excitation coil piercing a superconducting ring is used to generate an ever increasing persistent current in the ring, until the current destroys the order parameter. Given that the penetration depth λ is known, this experiment measures, hypothetically, the coherence length ξ. We examine various aspects of this theoretically driven hypothesis by testing niobium rings with different dimensions, and by comparing the results to the known values of ξ. We then apply the method to two La1.875Sr0.125CuO4 rings at T→0. In one, the current flows in the CuO2 planes, hence it is set by ξab. In the other, the current must cross planes and is determined by ξc. We find that ξc=1.3±0.1 nm, and ξab<2.3nm, indicating that at low temperatures the Cooper pairs are three dimensional.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.875Sr0.125CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+x 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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