Silicon’s Hidden Form: Unlocking the Mystery of Si-XIII
![Silicon’s transition between the Si-XIII phase and its more stable, metastable counterparts-including BC8, R8, and the [latex]d_c[/latex] and [latex]h_d[/latex] phases-is not singular, but rather unfolds along multiple minimum energy pathways, as determined by Solid State Nudged Elastic Band calculations, suggesting a complex energy landscape governing phase transformations in this foundational material.](https://arxiv.org/html/2602.24248v1/2602.24248v1/x4.png)
After decades of pursuit, researchers have finally determined the precise atomic structure of the elusive Si-XIII phase of silicon, resolving a long-standing challenge in materials science.
![Silicon’s transition between the Si-XIII phase and its more stable, metastable counterparts-including BC8, R8, and the [latex]d_c[/latex] and [latex]h_d[/latex] phases-is not singular, but rather unfolds along multiple minimum energy pathways, as determined by Solid State Nudged Elastic Band calculations, suggesting a complex energy landscape governing phase transformations in this foundational material.](https://arxiv.org/html/2602.24248v1/2602.24248v1/x4.png)
After decades of pursuit, researchers have finally determined the precise atomic structure of the elusive Si-XIII phase of silicon, resolving a long-standing challenge in materials science.

It’s common for series to start strong or finish well, but sometimes lose steam in the middle. That doesn’t necessarily make them bad, just inconsistent. But for readers looking for a consistently excellent series, there are a few gems that begin with incredible first books and only get better from there. From the author of The Will of the Many‘s debut to a highly-regarded grimdark trilogy, these series consistently deliver.

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Many seemingly small games from the 1990s were initially very popular, but unfortunately, a lot of them aren’t remembered much anymore. Titles like Gex and Day of the Tentacle don’t receive the recognition they deserve now, and they still hold up incredibly well, even when compared to today’s games.
![CrSb exhibits altermagnetic behavior, evidenced by band structure calculations - incorporating spin-orbit coupling via VASP - that reveal shifts in Fermi surfaces ([latex]FSs[/latex]) related to internal field effects and localized spin polarization ([latex]S\_z[/latex]) along the [latex]c[/latex]-axis, as visualized within the first Brillouin zone.](https://arxiv.org/html/2602.24033v1/2602.24033v1/x5.png)
New measurements of the material CrSb reveal a complex Fermi surface and confirm its unique altermagnetic properties, offering insights into this emerging class of magnetic materials.

Pop star Pink, her husband Carey Hart, and their children Willow, 14, and Jameson, 9, have officially moved to New York City, and they have a great reason for doing so.