Summary
It is well known that a vortex in type II superconductors traps a magnetic flux. Recently the possibility that a vortex can accumulate a finite electric charge as well has come to be realized. The sign and magnitude of the vortex charge not only is closely related to the microscopic electronic structure of the vortex, but also strongly affects the dynamical properties of the vortex. In this chapter we demonstrate that a vortex in high-T c superconductors (HTSC) indeed traps a finite electronic charge, using the high resolution measurements of the nuclear quadru-pole frequencies. We then discuss the vortex Hall anomaly whose relation with the vortex charging effect has recently received considerable attention. We show that the sign of the trapped charge is opposite to the sign predicted by the conventional BCS theory and deviation of the magnitude of the charge from the theory is also significant. We also show that the electronic structure of underlying system is responsible for the Hall sign in the vortex state and again the Hall sign is opposite to the sign predicted by the BCS theory. It appears that these unexpected features observed in both electrostatics and dynamics of the vortex may be attributed to the novel electronic structure of the vortex in HTSC.
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Matsuda, Y., Kumagai, Ki. (2002). Charged Vortices in High-T c Superconductors. In: Huebener, R.P., Schopohl, N., Volovik, G.E. (eds) Vortices in Unconventional Superconductors and Superfluids. Springer Series in Solid-State Sciences, vol 132. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04665-4_17
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DOI: https://doi.org/10.1007/978-3-662-04665-4_17
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