Xhmster 44 Jun 2026

Figure 1 displays the refined crystal structure of Xhmster‑44. The structure consists of (Xh = 0.5 K + 0.5 La) and TiSe₂ slabs . The Ti atoms form a square planar network coordinated by four Se atoms (Ti–Se = 2.53 Å). The Xh ions reside in the van der Waals gap, providing an average valence of +1.5, which donates electrons to the TiSe₂ layers.

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. xhmster 44

The quest for superconductors with high critical temperatures (T_c) continues to drive research across condensed‑matter physics and materials science. Since the discovery of cuprate high‑T_c superconductors in the 1980s, layered transition‑metal chalcogenides (TMCs) such as FeSe, NbSe₂, and the more recent nickelates have emerged as fertile ground for novel superconductivity due to their quasi‑two‑dimensional electronic structures and tunable carrier densities [1‑3]. Figure 1 displays the refined crystal structure of

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