Results 1 - 10 of 2030
Results 1 - 10 of 2030. Search took: 0.026 seconds
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[en] The vanishing of generalized helicity is shown to be the necessary and sufficient condition for a perfect conductor to display perfect diamagnetism, considered to be the defining attribute of a conventional superconductor. Although conventional superconductivity is brought about by quantum correlations in classical systems, prepared in the state of zero initial helicity (helicity is a constant of the motion for a perfect conductor), it can mimic the superconductor's behavior
[en] Magnetization of finite size systems in the form of mesoscopic rings has intrigued physicists for a long time. Theories to date predict paramagnetic behavior, but experiments consistently show diamagnetic behavior. We show that the evanescent modes that are always present in rings of finite thicknesses can carry very large diamagnetic currents that are also very sensitive to disorder. Their contribution has always been ignored so far. Their contribution has features similar to that observed in experiments
[en] Simple theoretical calculations on atomic diamagnetism are presented and compared with heuristic arguments. The existence of exponentially small anticrossings of energy levels in the B field diagram as pointed out recently is confirmed, and tentatively discussed in terms of general theorems of classical mechanics. Conjectures on conservation of nodal surfaces between the low and high field limits are shown to violate our results in the low field Coulomb limit. (orig.)
[en] We report the results of experimental measurements on atomic diamagnetism in inter-l and inter-n mixing conditions. They have been obtained using high resolution techniques on highly hydrogenic M = +-3 states of cesium, providing a pure experimental situation. Comparison with straightforward hydrogenic calculations and semi-classical predictions allow identification of the dominant lines of the spectrum which are shown to behave as precursors of the quasi Landau spectrum. (orig.)
[en] Here we present analytic results for the Slater sum and the magnetic moment for arbitrary magnetic field strengths for an assembly of harmonically confined, but initially free, electrons. The relevance of the results to the generalized Landau diamagnetism of such confined electrons is emphasized.