Anomalous Peak in the Superconducting Condensate Density of Cuprate High- Tc Superconductors at a Unique Doping State
C. Bernhard, J. L. Tallon, Th. Blasius, A. Golnik, Ch. Niedermayer
DOI 10.1103/PhysRevLett.86.1614 · Physical Review Letters
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Abstract
The doping dependence of the ratio of the superconducting condensate density to the effective mass, nso/mab*, was studied in detail by muon-spin rotation for Y0.8Ca0.2Ba2(Cu1−zZnz)3O7−δ and Tl0.5−yPb0.5+ySr2Ca1−xYxCu2O7. Our data show that nso/mab* exhibits a peak at a unique doping state in the overdoped regime. Its position coincides with the critical doping state, where the normal state pseudogap was reported to appear and to deplete the electronic density of states. This finding implies that the pseudogap primarily arises from a change in the electronic ground state rather than from thermal fluctuations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y0.8Ca0.2Ba2(Cu1-zZnz)3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85.5 | Pressure not reported | unknown |
| Tl0.5-yPb0.5+ySr2Ca1-xYxCu2O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 107 | 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 |
| Y0.8Ca0.2Ba2Cu2.94Zn0.06O6.45 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | unknown |
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