Superconducting Ordering in Vortex States of Clean Type II. Superconductors with Pinnings

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Point-like pinnings inevitably exist in real and bulk type II superconductors and, even in cleanlimit, need to be taken into account in describing the vortex states right at and below the solidification point. Such pinning effects are considered on the basis of the superconducting fluctuationtheory and putting emphasis upon a drastic pinning effect accompanying the solidification tran-sition, i.e., the vortex-glass (VG) instability in clean limit. XVe point out through an examinationof Gaussian VG susceptibility X.. that the VG instability in clean enough systems is indttcedby the first-order solidification transition of vortices. It is found that the diagonal (dissipative)conductivity o.. in directions perpendicular to the field has a term becoming divergent dueto the Gaussian VG instability. Our result indicates that, in any situation with no true VGtransition, o.. reduces, in clean limit, to the expression in the pinning-free case, while a trueVG transition certainly makes o.. divergent at the first-order solidification transition survivingthe point-like pinnings. By cotnbining this result with existing resistivity data, the presence ofa 3D true VG transition line over an entire field range below H.z(T) is expected, and possiblenaagnetic phase diagrams of real bulk type II superconductors are proposed. Pinning effectson the Hall conductivity are also exanained and found to be present once the supercondtrctingfluctuation is included.
社団法人日本物理学会の論文
1996-12-15

著者

Ikeda Ryusuke
Department Of Physics Kyoto University

Superconducting Ordering in Vortex States of Clean Type II. Superconductors with Pinnings

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