Thin-film superconductor in an exchange field

Hao, Xiaojian; Moodera, J. S.; Meservey, R.

doi:10.1103/physrevlett.67.1342

Cited by 108 publications

(136 citation statements)

References 17 publications

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“…In particular, it was shown [5] that a thin S/F bilayer is equivalent to a magnetic superconductor in an effective exchange field. Another way to create an exchange field in a thin superconducting film is to contact it to a ferromagnetic insulator [6][7][8][9][10], as it was observed experimentally [9] and justified theoretically [10].…”

mentioning

confidence: 83%

Recovering of superconductivity in S/F bilayers under spin-dependent nonequilibrium quasiparticle distribution

Bobkova

Bobkov

2015

Jetp Lett.

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We study theoretically the influence of spin accumulation on superconductivity in a superconductor/ferromagnet bilayer. It is well-known that the superconductivity in S/F bilayers is suppressed by the proximity to a ferromagnet. The spin accumulation by itself is also a depairing factor. But here we show that creation of the spin accumulation on top of effective exchange depairing, caused by the proximity to a ferromagnet, can lead to an opposite result. The superconductivity can be partially recovered by spin-dependent quasiparticle distribution. The systems with realistic parameters are considered and the possible experimental setup is proposed.

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mentioning

confidence: 83%

Recovering of superconductivity in S/F bilayers under spin-dependent nonequilibrium quasiparticle distribution

Bobkova

Bobkov

2015

Jetp Lett.

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“…To achieve this would require a magnetic field of between 100 T and 300 T, much larger than the field produced by the EuS . 24,25 Some of this difference could be due to the dielectric medium in which the nanotube is located. 26 The observed order of magnitude increase in DX is difficult to account for in this way, and can more easily be described by the predicted singlet-triplet energy spacing.…”

Section: Discussionmentioning

confidence: 99%

Photoexcitation of the triplet exciton in single wall carbon nanotubes

et al. 2009

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The carbon nanotube photoexcitation spectrum is dominated by excitonic transitions, rather than interband transitions between continuum states. There are eight distinct excitonic transitions (four singlet and four triplet), each with two-fold degeneracy. Because the triplet excitons are spin polarized with electron and hole spins both pointing in the same direction, they are optically inactive, and optical spectroscopy has revealed no evidence for their existence. Here, we show that by the interaction with a spin filter ferromagnetic semiconductor, photoexcitation of the carbon nanotube triplet exciton is possible, and its contribution to the photocurrent can be detected. The perturbation provided by the spin filter allows for inter-system mixing between the singlet and triplet excitonic states, and relaxes the spin selection rules. This supplies the first evidence for the existence of the triplet exciton, and provides an avenue for the optical excitation of spin polarized carriers in carbon nanotubes.

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“…In transition metal ions-doped TIs, long-range ferromagnetic order was found in [30][31][32] Besides, the zero-field half integer quantum Hall effect is also expected to be a hallmark of the FI/TI/FI sandwich structure. 7 In magnetic element-doped and ferromagnetic TIs, the observation of QAHE has set the possibility and hope for observing many other exotic quantum phenomena predicted in TIs, such as a topological magnetoelectric effect, 7 image magnetic monopoles, 11 and Majorana bound states.…”

Section: Conclusion and Prospectsmentioning

confidence: 99%

“…30,31 One of the excellent properties exhibited by adjoining the FI to a superconducting TI layer is that the local exchange field experienced by the TI is able to lift spin degeneracy without destroying the superconducting pairing, in complete contrast to magnetic impurity doping. 32,33 This opens up significant new avenues for functional ferromagnetic superconducting TI devices.…”

Section: Fi/ti Heterostructuresmentioning

confidence: 99%