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ЖУРНАЛЫ // Письма в Журнал экспериментальной и теоретической физики // Архив

Письма в ЖЭТФ, 2004, том 80, выпуск 9, страницы 680–683 (Mi jetpl2157)

Эта публикация цитируется в 14 статьях

КОНДЕНСИРОВАННЫЕ СРЕДЫ

Manifestation of geometric effects in temperature behavior of AC magnetic response of Josephson Junction Arrays

S. Sergeenkovab, F. M. Araujo-Moreiraa

a Departamento de Física e Engenharia Física, Grupo de Materiais e Dispositivos, Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos, Universidade Federal de São Carlos, SP, 13565-905 São Carlos, Brazil
b Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Reg., Russia

Аннотация: By improving resolution of home-made mutual-inductance measurements technique, a pronounced step-like structure (with the number of steps $n=4$ for all AC fields) has been observed in the temperature dependence of AC susceptibility in artificially prepared two-dimensional Josephson Junction Arrays (2D-JJA) of unshunted Nb–AlO$_x$–Nb junctions with $\beta _L$(4.2 K) = 30. Using a single-plaquette approximation of the overdamped 2D-JJA model, we were able to successfully fit our data assuming that steps are related to the geometric properties of the plaquette. The number of steps $n$ corresponds to the number of flux quanta that can be screened by the maximum critical current of the junctions. The steps are predicted to manifest themselves in arrays with the inductance related parameter $\beta _L(T)$ matching a "quantization" condition $\beta _L(0)=2\pi (n+1)$.

PACS: 74.25.Ha, 74.50.+r, 74.80.Bj

Поступила в редакцию: 23.09.2004

Язык публикации: английский


 Англоязычная версия: Journal of Experimental and Theoretical Physics Letters, 2004, 80:9, 580–583

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