Magnetic field dependence of the superconducting energy gap in Bi2Sr2CaCu2O8+δ probed using break-junction tunneling spectroscopy
S. I. Vedeneev, B. A. Piot, D. K. Maude
DOI 10.1103/PhysRevB.81.054501 · Physical Review B
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Abstract
The magnetic-field-dependent in-plane tunneling conductance dI/dV(V) on the Bi2Sr2CaCu2O8+δ single crystals has been investigated using break junctions. In contrast to previous tunneling measurements of Bi2212, where the position of the gap peak in dI/dV(V) remained almost unchanged in the applied magnetic fields, our data present evidence that the magnetic field suppresses the superconducting gap in Bi2212. The behavior of a dip-hump structure in tunnel spectra indicates that the magnetic field acts differently on the gap and pseudogap and suggests that the pseudogap does not correlate with the existence of a superconducting gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2.22Sr1.55Ca1.17Cu2.01O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 84 | Pressure not reported | onset |
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | unknown |
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