In-Plane Anisotropy of the Penetration Depth Due to Superconductivity on the Cu-O Chains in YBa2Cu3O7−δ, Y2Ba4Cu7O15−δ, and YBa2Cu4O8
J. L. Tallon, C. Bernhard, U. Binninger, A. Hofer, G. V. M. Williams, E. J. Ansaldo, J. I. Budnick, Ch. Niedermayer
DOI 10.1103/PhysRevLett.74.1008 · Physical Review Letters
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Abstract
Muon spin relaxation studies on a variety of polycrystalline YBa2Cu3O7−δ, Y2Ba4Cu7O15−δ, and YBa2Cu4O8 samples show that the δ-dependent depolarization rate (and hence nsm*) is greatly enhanced when the CuO chains are free of disorder (δ→0). Ca substitution allows the doping on the planes and chains to be independently controlled and the enhanced depolarization rate can be unambiguously attributed to condensation of mobile carriers on the chains as Cooper pairs, thus increasing the total condensate density ns. The in-plane London penetration depth is highly anisotropic: λa=155 nm but λb falls as low as 80 nm when δ→0.
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. | 92 | Pressure not reported | unknown |
| Y2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Y2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
| Y2Ba4Cu7O15-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | unknown |
| YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| YBa2-xLaxCu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| Y0.9Ca0.1Ba2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87 | Pressure not reported | unknown |
| Y0.8Ca0.2Ba2Cu3O6.2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 49 | Pressure not reported | unknown |
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