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Temperature dependence of the magnetic field penetration depth in YBa2Cu3O7−δ measured on ultra fine powder

✍ Scribed by V.F. Gantmakher; N.I. Golovko; I.G. Naumenko; A.M. Neminsky; A.V. Petinova

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
483 KB
Volume
171
Category
Article
ISSN
0921-4534

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✦ Synopsis

The temperature dependence of the magnetic field penetration depth 2 (T) in superconducting YBazCu307_ a has been determined by measuring the AC susceptibility of fine powder at the frequency l 05 Hz. The reason for noticeable changes in 2 at low temperatures has been found out: strong scattering of carriers by low-frequency excitations. The coupling constant which controls the superconductivity has been estimated. At low temperatures a paramagnetic signal superimposed to the superconductivity one has been observed. It is probably due to alteration in the interaction of the magnetic moments near the surface of the particles.

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Measurement of penetration depth λ(T) in YBa2Cu3O7−δ thin film
✍ JuYoung Lee; Thomas R. Lemberger; S. Foltyn; X.D. Wu 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 143 KB

We present the magnetic penetration depth X(/) in two laser ablated YBa~Cu307\_ n thin films, determined by the two-coil method. The slope of 1/Xz(/) near T~, the only exactly measurable quantity, extrapolates to 930A at T=0, which compares well with 830~, in the high quality single crystal recently