Paramagnetic Meissner, vortex, and onionlike ground states in a finite-size Fulde-Ferrell superconductor
V. D. Plastovets, D. Yu. Vodolazov
DOI 10.1103/PhysRevB.101.184513 · Physical Review B
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Abstract
We theoretically find that a finite-size Fulde-Ferrell (FF) superconductor (which is characterized by spatially nonuniform ground state Ψ∼exp(−iqFFr) and |Ψ|(r)=const in the bulk case, where Ψ is a superconducting order parameter) has paramagnetic Meissner, vortex, and “onion” ground states with |Ψ|(r)≠const. These states are realized due to boundary effect when the lateral size of a superconductor L∼1/qFF. We argue that predicted states could be observed in a thin disk/square made of a superconductor–ferromagnet–normal metal trilayer with L≃150–600nm.
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