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Probing the superconducting ground state of the rare-earth ternary boride superconductors <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi>RuB</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math> ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>R</mml:mi><mml:mo>=</mml:mo></mml:mrow></mml:math> Lu,Y) using muon-spin rotation and relaxation
The superconductivity in the rare-earth transition-metal ternary borides $R{\mathrm{RuB}}_{2}$ (where $R=\text{Lu}$ and Y) has been investigated using muon-spin rotation and relaxation. Measurements made in zero field suggest that time-reversal symmetry is preserved upon entering the superconducting state in both materials; a small difference in depolarization is observed above and below …