Tunneling in the ab plane of the high-Tc superconductor Bi2Sr2CaCu2O8+δ in high magnetic fields

S. I. Vedeneev; A. G. M. Jansen; P. Samuely; V. A. Stepanov; A. A. Tsvetkov; P. Wyder

doi:10.1103/PhysRevB.49.9823

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Tunneling in the ab plane of the high-Tc superconductor Bi2Sr2CaCu2O8+δ in high magnetic fields

S. I. Vedeneev, A. G. M. Jansen, P. Samuely, V. A. Stepanov, A. A. Tsvetkov, P. Wyder

DOI 10.1103/PhysRevB.49.9823 · Physical Review B

T1

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Abstract

Tunneling break junctions of single crystals of Bi-Sr-Ca-Cu-O show a reproducible superconducting-gap structure that can be fully described with a broadened BCS density of states. The obtained ratio between the energy gap Δ and the critical temperature Tc amounts to 2Δ/Tc=6.2. In a magnetic field up to 20 T, the conductance curve shows additional broadening but the energy gap remains constant. From a comparison of the magnetoresistance and tunneling data for different orientations of the magnetic field, it follows that the break junctions probe the superconducting properties in the ab plane. Both the magnetic field and temperature dependence of the tunneling characteristics are in agreement with the known dependences for the classical superconductors.

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.	80	Pressure not reported	onset
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	80	Pressure not reported	onset