Novel Anisotropy in the Superconducting Gap Structure of Bi2Sr2CaCu2O8+δ Probed by Quasiparticle Heat Transport
Yoichi Ando, J. Takeya, Yasushi Abe, X. F. Sun, A. N. Lavrov
DOI 10.1103/PhysRevLett.88.147004 · Physical Review Letters
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Abstract
Since the nature of pairing interactions is manifested in the superconducting gap symmetry, the exact gap structure, particularly any deviation from the simple dx2−y2 symmetry, would help in elucidating the pairing mechanism in high- Tc cuprates. Anisotropic heat transport measurement in Bi2Sr2CaCu2O8+δ reveals that the quasiparticle populations are different for the two nodal directions and thus the gap structure must be uniquely anisotropic, suggesting that pairing is governed by interactions with a rather complicated anisotropy. Intriguingly, it is found that the “plateau” in the magnetic-field dependence of the thermal conductivity is observed only in the b-axis transport.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.5 | Pressure not reported | zero_resistance |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90.5 | Pressure not reported | zero_resistance |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure not reported | unknown |
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