Collective vortex pinning and merging of the irreversibility line and second peak effect in optimally doped Ba1−xK x BiO 3 single crystals

Unveiling the superconducting mechanism of Ba$_{0.51}$K$_{0.49}$BiO$_3$

“…Sample synthesis and characterization: High quality Ba 0.51 K 0.49 BiO 3 single crystals were synthesized by the self-flux method as described elsewhere 37 . The chemical composition was determined by electron probe micro-analysis (EPMA) and normalized to the stoichiometric value of Bi.…”

Comparative study of vortex dynamics in CaKFe4As4 and Ba0.6K0.4Fe2As2 single crystals

“…Although these two relaxation rates are obtained by using two distinct ways, it has been shown that to some extent, Q and S are equal to each other and provide similar information about the vortex dynamics [36,37]. To analyze the experimental data, we adopt the model of Anderson [7] for thermally activated vortex motion, namely,…”

A hybrid Monte Carlo study of bond-stretching electron–phonon interactions and charge order in BaBiO3

“…To calculate λ in the noninteracting limit, we set Ω(q) = Ω 0 and approximate the delta functions appearing in Eq. (11) with Lorentz distributions δ(x) ≈ L γ (x) and half-width at half-maximum set to γ = 10 meV. We then calculate the average over the FS using a 50 3 grid of momentum points.…”

“…To estimate the effective total λ eff and mode-resolved λ eff q dimensionless coupling constants, we approximated Ω q in Eq. (11) with the renormalized dispersion Ω(q, 0) [Eq. (7)].…”

“…These aspects make the bismuthates a compelling platform for studying high-T c superconductivity in proximity to a charge-ordered state, using uncorrelated models free from issues like the fermion sign problem. Indeed, there has been a recent resurgence of interest in these compounds, using a host of modern thin film syntheses 9,11,12 , spectroscopic 9,12,13 , and theoretical 10,[14][15][16][17][18][19] techniques.…”