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

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

2009-10-29

arxiv.org/abs/0910.5557v2

Phys. Rev. B 81, 014525 (2010)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.81.014525

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.

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