caa a22 4500 445379790 CHVBK 20180317143013.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10948-011-1159-8 doi (NATIONALLICENCE)springer-10.1007/s10948-011-1159-8 Koizumi Hiroyasu Institute of Materials Science, University of Tsukuba, 305-8573, Tsukuba, Ibaraki, Japan aut Spin-vortex Superconductivity [Elektronische Daten] [Hiroyasu Koizumi] We present a theory of superconductivity based on the theoretical prediction that a macroscopic persistent current is generated by spin-vortices. It explains the origin of the phase variable θ that is canonical conjugate to the superfluid density as a Berry phase arising from the spin-vortex formation. This superconductivity does not require Cooper-pairs as charge carriers, thus, is not directly related to the standard theory based on the BCS one; however, it exhibits the flux quantization in the unit Φ 0=hc/2|e|, where h is Planck's constant, c the speed of light, and e the electron charge; and the AC Josephson frequency, f J=2|e|V/h, where V is the voltage of the battery connected to the superconductor-insulator-superconductor junction. In due course, it is found that the standard derivation of the AC Josephson frequency misses a term arising from the flow of particles through the leads connected to the junction. If this contribution is included, the observed f J indicates that the phase θ is a variable conjugate to the number density of charge e carriers instead of the currently accepted charge 2e carriers. We propose an experiment that discriminates whether it is e or 2e. If the above claim is verified, it means that the BCS theory cannot predict whether a particular compound is a superconductor or not since it does not explain the origin of θ. A connection between the present mechanism and the BCS mechanism is discussed; the fact that the BCS theory gives an excellent estimate of T c is attributed to the fact that it predicts the temperature at which spin-vortices become long-lived due to the energy gap formation; since the stabilization by the electron-pair formation is compatible with the present mechanism, asymmetries observed in the even and odd number of electron systems are preserved. The most notable difference is that the persistent current generation is formulated in a strictly particle-number-conserving manner. Thus, it does not violate the superselection rule for the total charge. The Author(s), 2011 Phase of the superconducting order parameter nationallicence Spin-vortices nationallicence Berry phase nationallicence Josephson effect nationallicence Cuprates nationallicence Loop currents nationallicence Magnetic excitations nationallicence Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/6(2011-08-01), 1997-2011 1557-1939 24:6<1997 2011 24 10948 https://doi.org/10.1007/s10948-011-1159-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-011-1159-8 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Koizumi Hiroyasu Institute of Materials Science, University of Tsukuba, 305-8573, Tsukuba, Ibaraki, Japan aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/6(2011-08-01), 1997-2011 1557-1939 24:6<1997 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer