Heat capacity of superconducting Ba0.6K0.4BiO3 near Tc
J. E. Graebner, L. F. Schneemeyer, J. K. Thomas
DOI 10.1103/PhysRevB.39.9682 · 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
Measurements of the heat capacity of single crystals of Ba0.6K0.4 BiO3 in the range 10–40 K and in magnetic fields up to 60 kOe reveals a jump at Tc. The phase diagram of Hc2(T) can thus be determined calorimetrically, yielding values of Tc(H=0)=31.5 K and dHc2/dT=-5.2 kOe/K, in agreement with recent magnetization measurements. From these data, and the value of dHc1/dT from magnetization data, the size of the jump is consistent with at least 40% of the sample volume becoming a superconductor, indicating that superconductivity in this material is a bulk property and not due to a trace amount of a second phase. The corresponding value of the electronic specific-heat coefficient is γ=1.5 mJ/mol K2. Comparison with the band-structure density of states yields a value of the electron-phonon coupling constant λ of 0.35, consistent with the assumption that the material is a weakly coupled superconductor.
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. | 31.5 | Pressure not reported | unknown |
| BaPb0.75Bi0.25O3 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
Superconducting properties of the Ba1−xRbxBiO3 system
similarity 0.95Izumi Tomeno & Ken Ando
Source status unknown — claims are unverified
Anisotropic Enhancement of Superconductivity in Heavy-Ion Irradiated (K,Ba)BiO3
similarity 0.95C. Marcenat et al.
Source status unknown — claims are unverified
Unveiling the Superconducting Mechanism of Ba0.51K0.49BiO3
similarity 0.95C. H. P. Wen et al.
Source status unknown — claims are unverified
Thermodynamics of the vortex liquid in heavy-ion-irradiated superconductors
similarity 0.94Cornelis J. van der Beek et al.
Source status unknown — claims are unverified
Specific heat of superconducting κ-(BEDT-TTF)2Cu(NCS)2 near Tc [where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene]
similarity 0.94J. E. Graebner et al.
Source status unknown — claims are unverified
Superconductivity in Ba1−xKxBiO3
similarity 0.94Wei Jin et al.
Source status unknown — claims are unverified