Paramagnetic Meissner, vortex and 'onion' ground states in Fulde-Ferrell finite-size superconductor

Abstract

We theoretically find that finite size Fulde-Ferrell (FF) superconductor (which is characterized by spatially nonuniform ground state $\Psi \sim \text{exp}(-i{\mathbf{q}}_{FF}\mathbf{r})$ and $|\Psi |(r)=const$ in the bulk case, where $\Psi$ is a superconducting order parameter) has paramagnetic Meissner, vortex and 'onion' ground states with $|\Psi |(r)\ne const$. These states are realized due to boundary effect when the lateral size of superconductor $L\sim 1/q_{FF}$. We argue, that predicted states could be observed in thin disk/square made of superconductor-ferromagnet-normal metal trilayer with $L\simeq 150-600nm$.

9 pages, 8 figures

References in corpus (4)

• Odd-frequency superconducting states with different types of Meissner response: Problem of coexistence
• Consequences of bulk odd-frequency superconducting states for the classification of Cooper pairs
• Current-carrying states in FFLO superconductors
• FFLO state in thin superconducting films

Cited by in corpus (2)

• Microscopic derivation of superconductor-insulator boundary conditions for Ginzburg-Landau theory revisited. Enhanced superconductivity at boundaries with and without magnetic field
• Voltage controllable superconducting state in the multi-terminal superconductor-normal metal bridge