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].
A common strategy to elevate T_c in TMCs involves intercalation or chemical pressure—the insertion of electropositive ions or molecules between the conducting layers to modulate the electronic band filling and lattice dynamics [4‑6]. However, many of these approaches require external pressure, complex synthesis, or result in limited superconducting volume fractions.
Here we introduce Xhmster‑44, 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.
In this paper we detail (i) the crystal growth methodology, (ii) structural analysis via single‑crystal X‑ray diffraction (SCXRD) and neutron diffraction, (iii) comprehensive physical‑property measurements confirming bulk superconductivity, and (iv) DFT‑based theoretical insights into the pairing mechanism.
Figure 1 displays the refined crystal structure of Xhmster‑44. The structure consists of alternating Xh–Se sheets (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.
| Parameter | Value | |-----------|-------| | Space group | P4/mmm | | a (Å) | 3.872(1) | | c (Å) | 13.456(2) | | Xh occupancy | 0.50 K / 0.50 La | | Ti–Se bond length (Å) | 2.53 | | Se–Se interlayer distance (Å) | 3.12 |
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During the launch of a major video‑game tournament, Xhmster 44 ingested live chat sentiment analysis. Positive spikes triggered bright, ascending arpeggios, while negative spikes introduced dissonant drones. Viewers could see the immediate impact of their collective mood on the audiovisual output, turning the stream into a participatory performance.
Real‑time ocean buoy data (wave height, temperature, salinity) fed into the system. Each metric controlled a distinct instrument: wave height shaped a low‑frequency sine wave, temperature modulated a shimmering high‑frequency pad, and salinity altered the reverb decay. The resulting soundscape was accompanied by a fluid, abstract 3D ocean model that rippled in response to the same data.
First‑principles calculations employed Quantum ESPRESSO 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.