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Susceptibility measurements of the temperature dependence of λ(T) in aligned YBa2Cu3O7 powder samples

✍ Scribed by L. Guerrin; H. Alloul; G. Collin

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
165 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

Accurate measurements of the ac susceptibility x(T) have been performed on YBa2Cu307 powder samples of calibrated size at nearly perfect stoechiometry with an ac magnetic field perpendicular or parallel to the ab plane. Drastic changes in x(T) with the average crystallite size and with the field direction are evidenced. For T<0.2 T c the T variations of z(T) directly reflect those of MT) and in both directions a quadratic T dependence is found This result is at variance wifll a BCS model with an isotropic superconducting gap The low excitations can be interpreted rather with conventional pairing (anisotropic s-wave) or unconventional pairing (d-wave with disorder).

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