Excess current in ferromagnet-superconductor structures with fully polarized triplet component
| Autor: | A. F. Volkov, Andreas Moor, Konstantin B. Efetov |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Physics
Superconductivity Condensed matter physics Condensed Matter - Superconductivity Computer Science::Information Retrieval FOS: Physical sciences Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing) Field (mathematics) Electron 01 natural sciences 010305 fluids & plasmas Andreev reflection Superconductivity (cond-mat.supr-con) Ferromagnetism Condensed Matter::Superconductivity 0103 physical sciences Spin-flip Cooper pair 010306 general physics Spin-½ |
| Zdroj: | Physical Review B. 93 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.93.174510 |
| Popis: | We study the $I$-$V$ characteristics of S$_{\text{T}}$/n/N contacts, where S$_{\text{T}}$ is a BCS superconductor S with a built-in exchange field $h$, n represents a normal metal wire, and N---a normal metal reservoir. The superconductor S$_{\text{T}}$ is separated from the n-wire by a spin filter which allows the passage of electrons with a certain spin direction so that only fully polarized triplet Cooper pairs penetrate into the n-wire. We show that both the subgap conductance $\sigma_{\text{sg}}$ and the excess current $I_{\text{exc}}$, which occur in conventional S/n/N contacts due to Andreev reflection (AR), exist also in the considered system. In our case, they are caused by unconventional AR that is not accompanied by spin flip. The excess current $I_{\text{exc}}$ exists only if $h$ exceeds a certain magnitude $h_{\text{c}}$. At ${h < h_{\text{c}}}$ the excess current is converted into a deficit current $I_\text{{def}}$. The dependencies of the differential conductance and the current $I_{\text{exc}}$ are presented as a function of voltage and $h$. Comment: 7+ pages, 5 figures |
| Databáze: | OpenAIRE |
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