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Quasiparticle charge imbalance, first-order phase transition and quantum criticality in ferromagnet∕superconductor∕ferromagnet double-tunnel junctions
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10.1063/1.1804247
/content/aip/journal/jap/96/10/10.1063/1.1804247
http://aip.metastore.ingenta.com/content/aip/journal/jap/96/10/10.1063/1.1804247
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Superconducting gap vs the bias voltage at different temperatures. The lower-branch solutions are metastable. The inset is the phase digram in the plane. The superconducting state is under the phase boundary, whereas the normal state is outside the boundary. At , there exists a quantum phase transition with a quantum critical point indicated.

Image of FIG. 2.
FIG. 2.

Chemical-potential shift as a function of the bias voltage for different relative alignments of magnetizations; (b) the nonlinear relationship between and in the antiparallel alignment at different temperatures. For a comparison, is also depicted by a dashed line.

Image of FIG. 3.
FIG. 3.

Quasiparticle charge in SC as a function of the bias voltage in the antiparallel (A) and parallel (F) alignments. The relative orientation of the magnetizations does not have a remarkable effect on . The inset is the spin density vs the bias voltage in the antiparallel alignment. There is a discontinuity at the critical point from the S to the N state.

Image of FIG. 4.
FIG. 4.

Tunnel conductance as a function of the bias voltage , where is the conductance of the normal state in the antiparallel alignment. The inset is the tunnel magnetoresistance (TMR) vs the bias voltage, indicating that at low biases, the TMR is almost constant.

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/content/aip/journal/jap/96/10/10.1063/1.1804247
2004-11-05
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Quasiparticle charge imbalance, first-order phase transition and quantum criticality in ferromagnet∕superconductor∕ferromagnet double-tunnel junctions
http://aip.metastore.ingenta.com/content/aip/journal/jap/96/10/10.1063/1.1804247
10.1063/1.1804247
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