Valence spin ordering of the superconducting multilayer below extraordinarily high temperatures

The electric resistivity was measured in the mesoscopic system of the NbrCu superconducting multilayer. In case the inter-layer spin exchange correlation was maximal by a two-dimensional crossover effect, the resistivity increased by 0.8% at 100 K. Anomaly was observed only in the mesoscopic system with the temperature extraordinarily higher than the transition temperature. In this report, the phenomena is discussed in terms of the spin arrangement of the valence electron and it is concluded that the anomalous resistivity depends upon the spin arrangement of the valence electron. Furthermore, a hypothesis that the spin arrangement should be the precursor state of the superconducting phase transition is proposed by introducing the concept of ‘‘the thermal stabilization of the Cooper pair’’. q2000 Published by Elsevier Science B.V. PACS: 63.20Kr, Phonon electron and phonon–phonon interactions; 68.65qg, Low-dimensional structure; 71.10-w, Theories and models of many electron systems; 71.15 Fv, Atomic- and molecular-orbital method; 71.20-b, Electron density of states and band structure of crystalline solid; 71.27qa, Strongly correlated electron systems; 72.15-v, Electron conduction in metals and alloys; 72.15Qm, Scattering mechanism and Kondo effect; 73.23-b, Mesoscopic system; 73.50-h, Electronic transport phenomena in thin films and low-dimensional structure; 73.61-r, Electrical properties of specific thin films and layered structure; 74.20-z, Theories and models of superconducting state; 74.80Dm, Superconducting layer structures; 75.25qz, Spin arrangement in magnetically ordered materials; 77.22-d, Dielectric properties of solid and liquid