Kastening, Boris ; Morr, Dirk ; Alff, Lambert ; Bennemann, Karl (2009)
Charge transport and quantum phase transitions in singlet-superconductor/ferromagnet/singlet-superconductor junctions.
In: Physical Review B, 79 (14)
doi: 10.1103/PhysRevB.79.144508
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
We study the Josephson current, IJ, in a junction consisting of two s-wave superconductors that are separated by a ferromagnetic barrier possessing magnetic and nonmagnetic scattering potentials, g and Z, respectively. We discuss the general dependence of IJ on g, Z, and the phase difference � between the two superconductors. Moreover, we compute the critical current, Ic, for given g and Z, and show that it possesses two lines of nonanalyticity in the �g,Z� plane. We identify those regions in the �g,Z� plane where the Josephson current changes sign with increasing temperature without a change in the relative phase between the two superconductors, i.e., without a transition between the 0 and � states of the junction. Finally, we show that by changing the relative phase �, it is possible to tune the junction through a first-order quantum phase transition in which the spin polarization of the two superconductors’ combined ground state changes from �Sz�=0 to �Sz�=1/ 2.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2009 |
| Autor(en): | Kastening, Boris ; Morr, Dirk ; Alff, Lambert ; Bennemann, Karl |
| Art des Eintrags: | Bibliographie |
| Titel: | Charge transport and quantum phase transitions in singlet-superconductor/ferromagnet/singlet-superconductor junctions |
| Sprache: | Englisch |
| Publikationsjahr: | 2009 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 79 |
| (Heft-)Nummer: | 14 |
| DOI: | 10.1103/PhysRevB.79.144508 |
| Kurzbeschreibung (Abstract): | We study the Josephson current, IJ, in a junction consisting of two s-wave superconductors that are separated by a ferromagnetic barrier possessing magnetic and nonmagnetic scattering potentials, g and Z, respectively. We discuss the general dependence of IJ on g, Z, and the phase difference � between the two superconductors. Moreover, we compute the critical current, Ic, for given g and Z, and show that it possesses two lines of nonanalyticity in the �g,Z� plane. We identify those regions in the �g,Z� plane where the Josephson current changes sign with increasing temperature without a change in the relative phase between the two superconductors, i.e., without a transition between the 0 and � states of the junction. Finally, we show that by changing the relative phase �, it is possible to tune the junction through a first-order quantum phase transition in which the spin polarization of the two superconductors’ combined ground state changes from �Sz�=0 to �Sz�=1/ 2. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Dünne Schichten 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 30 Mär 2012 08:12 |
| Letzte Änderung: | 05 Mär 2013 10:00 |
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