High-resolution measurements of the magnetic penetrationdepth on Yba 2 Cu 4 O 8 single crystals
Journal of Physics and Chemistry of Solids, ISSN: 0022-3697, Vol: 67, Issue: 1, Page: 447-449
2006
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Article Description
In order to unveil the intrinsic electrodynamic response of the CuO 2 layers of cuprate superconductors and to differentiate this response from that of the charge reservoir layers, we measured the in-plane ( ab ) magnetic penetration depth on Yba 2 Cu 4 O 8 (Y124) single crystals by using a high-resolution mutual inductance technique. Among the various high- T c families of cuprate superconductors, Y124 is a stoichiometric compound characterized by a double CuO chain per unit cell acting as charge reservoir and by the absence of any disorder or structural inhomogeneities arising from chemical substitutions and/or oxygen vacancies. This feature makes Y124 an ideal system for our study. The experimental data show, in the low temperature region down to 4.2 K, a marked linear dependence of the variation Δ λ ab ≡λ ab ( T )− λ ab (4.2 K) with a small downturn at 9 K. This behavior confirms the existence of zero-energy thermally activated excitations, that are also observed in the Yba 2 Cu 3 O 7−δ (Y123) counterpart possessing only one CuO chain per unit cell. Whilst such linear behavior is consistent with the d -wave symmetry picture previously established for cuprates, the measured thermal activation rate, ∝∂ λ ab /∂ T, is however, more than a factor 4 larger in comparison with Y123. This result is consistent with a proximity model of superconducting planes and metallic chains and suggests that the reservoir layers strongly affect the low temperature behavior of the magnetic penetration depth in cuprates.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0022369705005007; http://dx.doi.org/10.1016/j.jpcs.2005.10.064; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=33645026884&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0022369705005007; https://api.elsevier.com/content/article/PII:S0022369705005007?httpAccept=text/xml; https://api.elsevier.com/content/article/PII:S0022369705005007?httpAccept=text/plain; https://dx.doi.org/10.1016/j.jpcs.2005.10.064
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