Here we introduce , a new member of the TMC family that achieves a record‑high T_c of 44 K without external pressure or post‑synthetic doping. The material’s unique mixed‑valence Xh site (a combination of alkali‑metal and rare‑earth ions) provides intrinsic charge transfer to the transition‑metal selenide layers, stabilizing a high‑density of states at the Fermi level and enhancing electron‑phonon interactions.
First‑principles calculations employed version 7.2 with the Perdew‑Burke‑Ernzerhof (PBE) exchange‑correlation functional. Ultrasoft pseudopotentials described core electrons, and a plane‑wave cutoff of 80 Ry was used. Brillouin‑zone sampling employed a 12 × 12 × 4 Monkhorst‑Pack grid. Phonon spectra and electron‑phonon coupling constants (λ) were obtained via density‑functional perturbation theory (DFPT) on a 6 × 6 × 2 q‑mesh. xhmster 44
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because of the way the data scurried in circles, never leaving the building’s internal grid.