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Time-reversal symmetry breaking and multigap superconductivity in the noncentrosymmetric superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">La</mml:mi><mml:mn>7</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ni</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
The ${\mathrm{Th}}_{7}{\mathrm{Fe}}_{3}$ family of superconductors provides a rich playground for unconventional superconductivity. ${\mathrm{La}}_{7}{\mathrm{Ni}}_{3}$ is the latest member of this family, which we here investigate by means of thermodynamic and muon spin rotation and relaxation measurements. Our specific heat data provides evidence for two distinct and approximately isotropic superconducting gaps. The …