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Interplay between magnetism and superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>UTe</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:math>
Time-reversal symmetry breaking in the strongly paramagnetic UTe${}_{2}$ is inferred from its spontaneous Kerr response below the superconducting critical temperature ${T}_{c}$. Focusing a Sagnac interferometer beam on the center of the sample, the authors present an extensive study of the magnetic-field-trained Kerr effect in this material, particularly of the nature …