Precise determination of the superconducting gap along the diagonal direction of Bi2Sr2CaCu2O8+y: Evidence for an extended s-wave gap symmetry
Guo-meng Zhao
DOI 10.1103/PhysRevB.75.140510 · Physical Review B
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Abstract
We report high-resolution spectra of the second derivative −d2(ReΣ)∕dω2 of the real part of electron self-energy Σ along the diagonal direction (where ω=EF−E−ΔD and ΔD is the diagonal superconducting gap) for a nonsuperconducting La1.97Sr0.03CuO4 (LSCO) crystal and a superconducting Bi2Sr2CaCu2O8+y (BSCCO) crystal with Tc=91K. The −d2(ReΣ)∕dω2 spectrum of the nonsuperconducting LSCO shows clear peak features, which match precisely with those in the phonon density of states obtained from neutron scattering. Similarly, if we assign ΔD=7±1meV for the superconducting BSCCO, the peak features in −d2(ReΣ)∕dω2 of this compound also match precisely with those in the phonon density of states and the tunneling spectrum. The present results rule out seemingly well accepted d-wave gap symmetry and strongly support an extended s-wave gap symmetry with eight line nodes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 74.3 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 87 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
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