Superconducting energy gap and a normal-state excitation in Ba0.6K0.4BiO3
Z. Schlesinger, R. T. Collins, J. A. Calise, D. G. Hinks, A. W. Mitchell, Y. Zheng, B. Dabrowski, N. E. Bickers, D. J. Scalapino
DOI 10.1103/PhysRevB.40.6862 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We report the first measurement of the energy gap of the high-temperature bismuth oxide superconductor Ba0.6K0.4BiO3 (Tc≃30 K). With temperature- and magnetic-field-dependent infrared reflectivity measurements, we obtain a reduced energy gap of 2Δ/kTc≃3.5±0.5, consistent with a BCS-type mechanism with moderate or weak coupling. In the normal state a broad peak in the infrared conductivity is observed near 5000 cm−1. This unusual infrared behavior is common to both the BaPb1−xBixO3 and the Ba1−xKxBiO3 systems and may provide a fundamental clue to the mechanism of superconductivity in the cubic bismuth oxides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
| Ba0.6K0.4BiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | onset |
| Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| BaPb1-xBixO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12 | Pressure not reported | unknown |
Similar papers
Calculations of the electronic structure and superconducting properties of the Ba(K)Pb(Bi)O3 system
similarity 0.97D. A. Papaconstantopoulos et al.
Source status unknown — claims are unverified
Field-tuned superconductor-insulator transition in BaPb1−xBixO3
similarity 0.97P. Giraldo-Gallo et al.
Source status unknown — claims are unverified
Theory of a higher-order phase transition: The superconducting transition in Ba0.6K0.4BiO3
similarity 0.97Pradeep Kumar
Source status unknown — claims are unverified
Pairing and phase separation in BiO3-based superconductors
similarity 0.96A. A. Aligia & M. Baliña
Source status unknown — claims are unverified
Superconducting properties of the Ba1−xRbxBiO3 system
similarity 0.96Izumi Tomeno & Ken Ando
Source status unknown — claims are unverified
Unveiling the Superconducting Mechanism of Ba0.51K0.49BiO3
similarity 0.96C. H. P. Wen et al.
Source status unknown — claims are unverified