Muon Spin Relaxation Measurements in Na_xCoO_2*yH_2O

Details Muon Spin Relaxation Measurements in Na_xCoO_2*yH_2O Muon Spin Relaxation Measurements in Na_xCoO_2*yH_2O

2003-11-18

arxiv.org/abs/cond-mat/0311427v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.92.257007

Using the transverse field muon spin relaxation technique we measure the temperature dependence of the magnetic field penetration depth $\lambda$, in the Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O system. We find that $\lambda,$ which is determined by superfluid density $n_{s}$ and the effective mass $m^{\ast}$, is very small and on the edge of the TF-$\mu$SR sensitivity. Nevertheless, the results indicate that the order parameter in this system has nodes and that it obeys the Uemura relation. By comparing $\lambda$ with the normal state electron density we conclude that $m^{\ast}$ of the superconductivity carrier is 70 times larger than the mass of bare electrons.

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