Probing the superconducting ground state of the noncentrosymmetric superconductors<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>Ca</mml:mi><mml:mi>T</mml:mi><mml:msub><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>T</mml:mi></mml:math>= Ir, Pt) using muon-spin relaxation and rotation

R. P. Singh, A. D. Hillier, Debanjan Chowdhury, J. A. T. Barker, D. McK. Paul, M. R. Lees, G. Balakrishnan

Abstract

The superconducting properties of $\mathrm{Ca}T{\mathrm{Si}}_{3}$ (where T = Pt and Ir) have been investigated using muon spectroscopy. Our muon-spin-relaxation results suggest that in both these superconductors time-reversal symmetry is preserved, while muon-spin-rotation data show that the temperature dependence of the superfluid density is consistent with an isotropic $s$-wave gap. The magnetic penetration depths determined from our transverse-field muon-spin-rotation spectra are found to be 448(6) and 150(7) nm for ${\mathrm{CaPtSi}}_{3}$ and ${\mathrm{CaIrSi}}_{3}$, respectively.

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