Phys. Rev. Lett. 81, 1298–1301 (1998)ĉ-Axis Electrodynamics of YBa2Cu3O7-δReceived 23 March 1998; published in the issue dated 10 August 1998 New measurements of surface impedance in YBa2Cu3O7-δ show that the ĉ-axis penetration depth and conductivity below Tc exhibit behavior different from that observed in the planes. The ĉ-axis penetration depth never has the linear temperature dependence seen in the ab plane. Instead of the conductivity peak seen in the planes, the ĉ-axis microwave conductivity falls to low values in the superconducting state, then rises slightly below 20 K. These results show that ĉ-axis transport remains incoherent below Tc, even though this is one of the least anisotropic cuprate superconductors. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.81.1298
DOI:
10.1103/PhysRevLett.81.1298
PACS:
74.25.Nf
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