نتایج جستجو برای: meissner effect
تعداد نتایج: 1642076 فیلتر نتایج به سال:
The Meissner effect and the Spin Meissner effect are the spontaneous generation of charge and spin current respectively near the surface of a metal, making a transition to the superconducting state. The Meissner effect is well known but, I argue, not explained by the conventional theory; the Spin Meissner effect has yet to be detected. I propose that both effects take place in all superconducto...
The holographic superconductor is the dual of superconductivity, but there no Meissner effect in standard superconductor. This because boundary Maxwell field added as an external source and not dynamical. We show analytically by imposing semiclassical equation on AdS boundary. Unlike Ginzburg-Landau (GL) theory, extreme type I limit cannot be reached even $e\ensuremath{\rightarrow}\ensuremath{\...
The question of whether the Bose-Einstein condensate ~BEC! is a necessary condition of the Meissner effect is examined. The electromagnetic susceptibility of a charged Bose gas with short-range repulsion is studied using the perturbation theory with respect to the repulsive force. With decreasing temperature, the Bosestatistical coherence grows, and prior to the BEC phase the susceptibility sho...
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Spinning black holes tend to expel magnetic fields. In this way they are similar to superconductors. It has been a ...
We report on the realization and characterization of a magnetic microtrap for ultracold atoms near a straight superconducting Nb wire with circular cross section. The trapped atoms are used to probe the magnetic field outside the superconducting wire. The Meissner effect shortens the distance between the trap and the wire, reduces the radial magnetic-field gradients, and lowers the trap depth. ...
We study the vortex phase diagram in untwinned YBCO crystals with columnar defects. These randomly distributed defects are expected to induce a "Bose glass" phase of localized vortices exhibiting a vanishing resistance and Meissner effect for magnetic fields H( perpendicular) transverse to the columns. We directly observe the transverse Meissner effect using a Hall probe array. As predicted, th...
By periodically driving a single bosonic Josephson junction (BJJ) with an impurity, synthetic gauge field is generated in the Fock space of system. At critical flux ground state undergoes quantum phase transition which analogous to Meissner-Abrikosov-vortex found type-II superconductors applied magnetic field. A second involving attractive interactions between bosons BJJ shown enhance sensitivi...
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