Abstract
We experimentally investigate the pairing symmetry and electrodynamics of YBa2Cu3O7−δ (YBCO), Nd1.852Ce0.152CuO4 (NCCO), and Nb by examining the temperature dependence of the penetration depthλ(T) and surface resistanceR s (T) in a comparative manner. Using the measuredλ(T) andR s (T), we extract the complex conductivityσ=σ1−iσ2 for each sample, and the quasiparticle scattering timeΤ(T) for theab-plane andc-axis in YBCO. While NCCO and Nb show a strong resemblance in their electrodynamic properties, the electrodynamic properties of YBCO are very distinctive from the others. The results suggest that NCCO may have a BCSs-wave-like pairing state, while YBCO possibly has an unconventional pairing state. We compare the results on YBCO with thed-wave pairing scenario, as well as with other possible theoretical models.
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