Anisotropic order parameter in Li-intercalated layered superconductor Li${}_x$ZrNCl

Abstract

In this study, it is shown that in a layered nitride superconductor, i.e., LixZrNCl (0.07<=x<=0.21), the superconducting order parameter is highly anisotropic in a sample with x=0.12, as inferred from both the temperature and the magnetic field dependences of the muon depolarization rate (sigma_s, proportional to the superfluid density). Moreover, the tendency of strong anisotropy with an increase in x is indicated by the T dependence of sigma_s. These observations are in good agreement with the recent theory that predicts the development of anisotropy in a d+id' gap upon carrier filling to the bands with disconnected Fermi surfaces on a honeycomb lattice.

5 pages, 5 figures

References in corpus (2)

• Phenomenological two-gap model for the specific heat of MgB_2
• Quasiparticle Excitations outside the Vortex Cores in MgB${}_2$ Probed by Muon Spin Rotation

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• Comment on "Superconductivity in electron-doped layered TiNCl with variable interlayer coupling"
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• Modeling Intercalated Group-4-Metal Nitride Halide Superconductivity with Interlayer Coulomb Coupling
• Superconductivity on the verge of metal-insulator transition in Cu${}_{1-x}$Zn${}_x$Ir${}_2$S${}_4$ probed by $\mu$SR