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Nodal Quasiparticle Lifetime in the Superconducting State ofBi2Sr2CaCu2Corson1, Orenstein2, Oh3 et al. 2000Phys. Rev. Lett.11220922View full textAdd to dashboardCite

“…Below T c , however, s 1 ͑T͒ depends strongly on frequency. At n 0.2 THz the T dependence is quite similar to that measured in the microwave regime on BSCCO single crystals [13][14][15]. s 1 rises to a maximum at 25 K, but at 5 K it remains much greater than s n ͑T c ͒.…”

“…In contrast to the strong dispersion in YBCO, s 1 is approximately constant in the range from n 10 50 GHz [13][14][15]. Consequently, the transport lifetime is not directly resolved in the conductivity spectra, although they do indicate that t qp ø ͑1͞2p͒50 GHz, which is much smaller than in YBCO.…”

“…In practice, this analysis yields results which are not self-consistent, for the following reason. Just as in YBCO [16], the condensate density varies as r s ͑0͒ 2 aT at low T [13][14][15], implying that the samples are in the clean d-wave regime, where r n aT . However, s 1 in BSCCO does not tend to zero as T approaches zero.…”

“…Thus t qp calculated from s 1 ͞r n appears to diverge, which is inconsistent with the observation that the conductivity is frequency independent in the microwave regime. To extract a finite t qp , one may assume that a large fraction of the quasiparticles remain 0031-9007͞00͞85(12)͞2569(4)$15.00 uncondensed, i.e., r n ͑T ͒ r n ͑0͒ 1 aT [15], or subtract the zero temperature limit of the dissipation prior to the two-fluid model analysis [18].…”

Temperature dependence of the order parameter of cuprate superconductors

“…Indeed, as seen in Fig. 3, agreement between theoretical curves Φ(T ) and values extracted from electrodynamical data of BSCCO [41] are quite good, except near the transition.…”