Determination of the superconducting gap in near optimally doped Bi2Sr2−xLaxCuO6+δ (x~0.4) from low-temperature specific heat
Yue Wang, Zhi-Yong Liu, C. T. Lin, Hai-Hu Wen
DOI 10.1103/PhysRevB.83.054509 · Physical Review B
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Abstract
Low-temperature specific heat of the monolayer high-Tc superconductor Bi2Sr2−xLaxCuO6+δ has been measured close to the optimal doping point (x~0.4) in different magnetic fields. The identification of both a T2 term in zero field and a H dependence of the specific heat in fields is shown to follow the theoretical prediction for d-wave pairing, which enables us to extract the slope of the superconducting gap in the vicinity of the nodes (vΔ, which is proportional to the superconducting gap Δ0 at the antinodes according to the standard dx2−y2 gap function). The vΔ or Δ0 (~12 meV) determined from this bulk measurement shows close agreement with that obtained from spectroscopy or tunneling measurements, which confirms the simple d-wave form of the superconducting gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+δ 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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