Physics – Condensed Matter – Superconductivity
Scientific paper
2005-12-23
Phys. Rev. Lett., 97, 017006 (2006)
Physics
Condensed Matter
Superconductivity
Phys. Rev. Lett. (in press). More details are included
Scientific paper
10.1103/PhysRevLett.97.017006
We investigate the order parameter of noncentrosymmetric superconductors Li$_2$Pd$_3$B and Li$_2$Pt$_3$B via the behavior of the penetration depth $\lambda(T)$. The low-temperature penetration depth shows BCS-like behavior in Li$_2$Pd$_3$B, while in Li$_2$Pt$_3$B it follows a linear temperature dependence. We propose that broken inversion symmetry and the accompanying antisymmetric spin-orbit coupling, which admix spin-singlet and spin-triplet pairing, are responsible for this behavior. The triplet contribution is weak in Li$_2$Pd$_3$B, leading to a wholly open but anisotropic gap. The significantly larger spin-orbit coupling in Li$_2$Pt$_3$B allows the spin-triplet component to be larger in Li$_2$Pt$_3$B, producing line nodes in the energy gap as evidenced by the linear temperature dependence of $\lambda(T)$. The experimental data are in quantitative agreement with theory.
Agterberg Daniel F.
Badica Petre
Hayashi Nobuhiko
Salamon Myron B.
Sigrist Manfred
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