# Superconductivity

## New submissions

[ total of 5 entries: 1-5 ]
[ showing up to 2000 entries per page: fewer | more ]

### New submissions for Mon, 19 Nov 18

[1]
Title: Re-entrant Fulde-Ferrell-Larkin-Ovchinnikov State in Small-Sized Superconductors
Subjects: Superconductivity (cond-mat.supr-con)

We study the effect of a parallel magnetic field in a thin and small superconductor. The field suppresses superconductivity through Zeeman coupling while stabilizes the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state at high fields before superconductivity is destroyed. When the spatial period of FFLO state is comparable to the size of the superconductor, there is a strong commensuration effect, which modifies the superconducting phase diagram. We investigate the FFLO state and the phase diagram in the presence of strong commensuration effect both for the $s$-wave and $d$-wave superconductors using the Bogoliubov de Gennes equation, Green function approach, and Ginzburg-Landau theory. We found that the superconducting phase diagram is strongly modulated. Interestingly, there is re-entrance of superconductivity upon increasing the magnetic field. The commensuration effect of the FFLO state can be used to detect the FFLO state in experiments.

[2]
Title: Theoretical evaluation of the screening-current-induced magnetic field in superconducting coils with tape wires
Comments: Applied Physics Express, to be published
Subjects: Superconductivity (cond-mat.supr-con)

We theoretically investigate the physical mechanism of the screening-current-induced field (SCIF) in solenoid coils wound with superconducting tape wires. We derive the direct relationship between the SCIF and the magnetization of tape wires, and a scaling law for the SCIF and the coil dimensions is demonstrated. A simple analytical expression of the SCIF is obtained as functions of current load factor, tape wire width, and the coil dimensions. We verify that the published data for the precise numerical computation of SCIF are roughly fitted by our theoretical results for flat coils where the height is smaller than the outer diameter.

### Replacements for Mon, 19 Nov 18

[3]  arXiv:1802.03864 (replaced) [pdf, ps, other]
Title: Projective Truncation Approximation for Equations of Motion of Two-Time Green's Functions
Comments: 14 pages, 8 figures, published version
Journal-ref: Phys. Rev. B 97, 165140 (2018)
Subjects: Strongly Correlated Electrons (cond-mat.str-el); Superconductivity (cond-mat.supr-con)
[4]  arXiv:1805.01704 (replaced) [pdf]
Title: Electron waiting times in hybrid junctions with topological superconductors
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