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Internal Friction Related to Carriers in High- Tc Superconductors
Ist Teil von
Physica status solidi. B. Basic research, 1993-09, Vol.179 (1), p.159-166
Ort / Verlag
Berlin: WILEY-VCH Verlag
Erscheinungsjahr
1993
Link zum Volltext
Quelle
Wiley-Blackwell Journals
Beschreibungen/Notizen
For both BiSrCaCuO and TlBaCaCuO samples, internal frictions (Q−l) in the kHz range reveal a plateau (Qp−1) above Tc and drop rapidly below Tc with the turning points at Tc. This kind of anomaly cannot be observed for nonsuperconducting samples. Moreover, it is discovered that Qp−1 is nearly proportional to the Hall carrier density for Y(Pr)BaCuO with various Pr content. These results show that the drop of Q−1 below Tc is closely related to superconducting condensation. The mechanism of Qp−1 may be attributed to the carrier jump induced by the stress‐induced reorientation of the polaron‐like distortions around the carriers. Further, taking into account the smearing of the superconducting gap structure resulting from the recombination of quasi‐particles and modifying the BCS relative jump rate the calculated results of internal friction below Tc are in fairly good agreement with experimental data. The superconducting gap Δ and the damping rate Γ for both BiSrCaCuO and TlBaCaCuO have also been obtained, they are in accordance with those got by tunneling spectrum and NMR methods, etc.