Magnetic Field Dependence of the Superconducting Gap and the Pseudogap in Bi2212 and HgBr2-Bi2212, Studied by Intrinsic Tunneling Spectroscopy
V. M. Krasnov, A. E. Kovalev, A. Yurgens, D. Winkler
DOI 10.1103/PhysRevLett.86.2657 · Physical Review Letters
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Abstract
Intrinsic tunneling spectroscopy in high magnetic field ( H) is used for a direct test of superconducting features in the quasiparticle density of states of pure Bi2212 and intercalated HgBr2-Bi2212 high- Tc superconductors. We were able to distinguish with great clarity two coexisting gaps: (i) the superconducting gap, which closes as H→Hc2(T), and (ii) the c-axis pseudogap, which does not change either with H or with T. Strikingly different H dependencies, together with previously observed different temperature dependencies of the two gaps, speak against a superconducting origin of the pseudogap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.5 | Pressure not reported | unknown |
| HgBr2-Bi2212 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 73 | Pressure not reported | unknown |
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