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Gold standard. Rigorous peer review, high editorial standards, and strong institutional reputation.
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This Nature physics article on quantum sensing and superconductivity is not directly relevant to AI safety; it appears to be a materials science research paper focused on experimental techniques rather than AI governance or safety topics.
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This Nature article describes a novel quantum sensing technique using nitrogen-vacancy color centers implanted in diamond anvil cells to perform local magnetometry at megabar pressures with sub-micron spatial resolution. The researchers applied this method to characterize the hydride superconductor CeH₉, directly imaging the Meissner effect and mapping superconducting regions. By combining magnetometry with electrical transport measurements, they revealed micron-scale inhomogeneities in the superconducting response and demonstrated how quantum sensing can enable optimization of superhydride materials synthesis under extreme pressure conditions.
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Imaging the Meissner effect in hydride superconductors using quantum sensors | Nature
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Subjects
Imaging techniques
Materials science
Physics
Quantum metrology
Superconducting properties and materials
Abstract
By directly altering microscopic interactions, pressure provides a powerful tuning knob for the exploration of condensed phases and geophysical phenomena 1 . The megabar regime represents an interesting frontier, in which recent discoveries include high-temperature superconductors, as well as structural and valence phase transitions 2 , 3 , 4 , 5 , 6 . However, at such high pressures, many conventional measurement techniques fail. Here we demonstrate the ability to perform local magnetometry inside a diamond anvil cell with sub-micron spatial resolution at megabar pressures. Our approach uses a shallow layer of nitrogen-vacancy colour centres implanted directly within the anvil 7 , 8 , 9 ; crucially, we choose a crystal cut compatible with the intrinsic symmetries of the nitrogen-vacancy centre to enable functionality at megabar pressures. We apply our technique to characterize a recently discovered hydride superconductor, CeH 9 (ref. 10 ). By performing simultaneous magnetometry and electrical transport measurements, we observe the dual signatures of superconductivity: diamagnetism characteristic of the Meissner effect and a sharp drop of the resistance to near zero. By locally mapping both the diamagnetic response and flux trapping, we directly image the geometry of superconducting regions, showing marked inhomogeneities at the micron scale. Our work brings quantum sensing to the megabar frontier and enables the closed-loop optimization of superhydride materials synthesis.
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