MBE法で作成したYBa_2Cu_3O_<7-d>単結晶薄膜の高調波複素帯磁率 [in Japanese] Higher-Harmonic Susceptibilities of a Single-Crystal YBa_2Cu_3O_<7-d> Thin Film Prepared by MBE [in Japanese]
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For the study of magnetic properties of high-Tc superconductors, we measured harmonic ac susceptibilities Xn=Xn-iXn " of a single-crystal YBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-d</SUB> thin film immersed in an external field H(t)-Hde+Hey cos(ωt), where Mc (≥0) is a do bias field and Hac (> 0) is an ac field amplitude. Measurements of Xn were carried out for n=1, 2, 3, 5, 7 and μ0Hac=0.1mT. The fundamental frequency was 132Hz. The observed results were analyzed within the construct of the Kim-Anderson model for critical-current density and the modified Bean model which takes into consideration the surface barrier and the lower critical field. The characteristics of the experimental results were well reproduced by the modified Bean model, suggesting that the surface barrier plays an essential role for the thin film.
- J. Jpn. Soc. Powder Powder Metallurgy
J. Jpn. Soc. Powder Powder Metallurgy 43(9), 1070-1075, 1996-09-15
Japan Society of Powder and Powder Metallurgy