Interlayer tunneling spectroscopy for deeply underdoped Bi2Sr2CaCu2O8+δ: Spectroscopic evidence for inhomogeneous superconductivity
Yoshiharu Yamada, Minoru Suzuki
DOI 10.1103/PhysRevB.74.054508 · Physical Review B
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Abstract
By using a small mesa structure and a short-pulse technique, we have measured the interlayer tunneling spectra of deeply underdoped Bi2Sr2CaCu2O8+δ with a Tc of ∼40K realized by partially substituting Sr with La. The superconducting peak observed at around 60meV is extraordinarily small and broad, presenting a sharp contrast to the optimally doped or slightly overdoped case. The most striking feature is, however, that the tunneling conductance displays a stepwise incremental change as T decreases across Tc in the wide voltage range observed. This behavior indicates that the superconducting state in the deeply underdoped region is inhomogeneous and phase separated on a length scale of less than several tens of nm.
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. | 40 | Pressure not reported | unknown |
| Bi2.0Sr1.79La0.38Ca0.65Cu1.92O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | zero_resistance |
| Bi2.0Sr1.79La0.38Ca0.65Cu1.92O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 44 | Pressure not reported | zero_resistance |
| Bi2.0Sr1.79La0.38Ca0.65Cu1.92O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 52 | Pressure not reported | zero_resistance |
| La2-xSrxCuO4 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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