This superconductivity dies then comes back to life

A uranium-based material exhibits a 'Lazarus phase' of superconductivity, defying destruction by powerful magnetic fields and reappearing at even higher intensities. | Contesto: cronaca

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• This superconductivity dies then comes back to life

Contesto

Scientists have discovered a bizarre and unprecedented form of superconductivity in the material uranium ditelluride (UTe2), where the ability to conduct electricity with perfect efficiency not only survives under crushing magnetic fields but is resurrected after initially vanishing. This phenomenon, observed in laboratory conditions, directly contradicts a fundamental rule of conventional superconductors, which are typically quashed by strong magnetic forces. The discovery, led by a collaborative research team, reveals a superconducting state that disappears at a certain magnetic field strength only to re-emerge more robustly at even higher intensities, a behavior so unexpected it has been informally dubbed the "Lazarus phase." The core finding challenges decades of established physics. Superconductivity, a quantum mechanical state where electrical resistance drops to zero, usually occurs at very low temperatures and is exquisitely fragile. One of its most notorious enemies is a strong magnetic field, which disrupts the paired electrons responsible for the effect. In all known superconductors, applying a sufficiently powerful field permanently kills the superconducting state. Uranium ditelluride shatters this paradigm, demonstrating that under specific, extreme conditions, the rules can be rewritten. Researchers probing UTe2 at temperatures near absolute zero watched as superconductivity faded under an applied magnetic field, following the expected script. However, as they continued to ramp up the field's strength in a specific crystal direction, the zero-resistance state abruptly returned. This rebirth occurred at field strengths far beyond what any standard theory predicts could be sustained. The material appears to host a fundamentally different, exceptionally resilient type of superconductivity, likely rooted in unique electron interactions stemming from its heavy uranium atoms. The implications of this discovery are profound for both fundamental science and future technology. Understanding the mechanisms behind this field-induced revival could unlock new classes of superconducting materials that operate under conditions previously thought impossible. This...

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Categoria: cronaca