Open AccessЦиркуляционный радиус и плотность критического тока в сверхпроводниках второго рода
Author(s) -
Д.М. Гохфельд
Publication year - 2019
Publication title -
pisʹma v žurnal tehničeskoj fiziki
Language(s) - English
Resource type - Journals
eISSN - 1726-7471
pISSN - 0320-0116
DOI - 10.21883/pjtf.2019.02.47212.17553
Subject(s) - superconductivity , condensed matter physics , crystallite , magnetization , critical current , radius , physics , materials science , current density , magnetic field , computer science , quantum mechanics , metallurgy , computer security
A method is proposed for estimating the length scale of currents circulating in superconductors. The estimated circulation radius is used for determining the critical current density on the basis of magnetic measurements. The obtained formulas are applicable to samples with negligibly small demagnetizing factors and to polycrystalline superconductors. The proposed method has been verified using experimental magnetization loops measured for polycrystalline YBa_2Cu_3O_7 – δ and Bi_1.8Pb_0.3Sr_1.9Ca_2Cu_3O_ x superconductors.