A spin triplet supercurrent through the half-metallic ferromagnet CrO2.
R. S. Keizer,Sebastian T. B. Goennenwein,T. M. Klapwijk,Guo-Xing Miao,Guo-Xing Miao,Gang Xiao,Arunava Gupta +6 more
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TLDR
A Josephson supercurrent is reported through the strong ferromagnet CrO2, from which it is inferred that it is a spin triplet supercurrent, and the underlying physical explanation is a conversion from spin singlet pairs to spin triplets at the interface.Abstract:
In general, conventional superconductivity should not occur in a ferromagnet, though it has been seen in iron under pressure. Moreover, theory predicts that the current is always carried by pairs of electrons in a spin singlet state, so conventional superconductivity decays very rapidly when in contact with a ferromagnet, which normally prohibits the existence of singlet pairs. It has been predicted that this rapid spatial decay would not occur if spin triplet superconductivity could be induced in the ferromagnet. Here we report a Josephson supercurrent through the strong ferromagnet CrO2, from which we infer that it is a spin triplet supercurrent. Our experimental set-up is different from those envisaged in the earlier predictions, but we conclude that the underlying physical explanation for our result is a conversion from spin singlet pairs to spin triplets at the interface. The supercurrent can be switched with the direction of the magnetization, analogous to spin valve transistors, and therefore could enable magnetization-controlled Josephson junctions.read more
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Spintronics: a challenge for materials science and solid-state chemistry.
TL;DR: In this Review, the most important developments in the field of spintronics are described from the point of view of materials science.
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Half-metallic ferromagnets: From band structure to many-body effects
TL;DR: A review of new developments in theoretical and experimental electronic-structure investigations of half-metallic ferromagnets (HMFs) is presented in this article, where the effects of electron-magnon interaction in HMFs and their manifestations in magnetic, spectral, thermodynamic, and transport properties are considered.
Journal ArticleDOI
Superconducting Spintronics
TL;DR: A complete synergy between superconducting and magnetic orders turns out to be possible through the creation of spin-triplet Cooper pairs, which are generated at carefully engineered superconductor interfaces with ferromagnetic materials as mentioned in this paper.
Journal ArticleDOI
Controlled Injection of Spin-Triplet Supercurrents into a Strong Ferromagnet
TL;DR: Long-ranged supercurrents are observed in a symmetric junction consisting of a superconductor, a conical magnet, and a ferromagnet using holmium injectors, consistent with spin-triplet proximity theory.
Journal ArticleDOI
Spin-polarized supercurrents for spintronics: a review of current progress.
TL;DR: In this article, the authors describe the controlled creation of long-range equal-spin triplet supercurrents in ferromagnets and their contribution to spintronics, which is a fruitful basis for the study of fundamental physics as they combine macroscopic quantum coherence with microscopic exchange interactions.
References
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The superconductivity of Sr 2 RuO 4 and the physics of spin-triplet pairing
TL;DR: In this paper, a summary and evaluation of the experimental properties of spin-triplet superconductivity in a quasi-two-dimensional Fermi liquid is presented. But the authors do not consider the effect of symmetry-breaking magnetic fields on the phase diagram.
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TL;DR: A superconducting point contact is used to determine the spin polarization at the Fermi energy of several metals because the process of supercurrent conversion at a superconductor-metal interface (Andreev reflection) is limited by the minority spin population near the Fermani surface.
Journal ArticleDOI
A theoretical description of the new phases of liquid He-3
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Journal ArticleDOI
Superconductivity on the border of itinerant-electron ferromagnetism in UGe2
Siddharth S. Saxena,Siddharth S. Saxena,Siddharth S. Saxena,P. Agarwal,K. Ahilan,F. M. Grosche,R. K. W. Haselwimmer,Markus J. Steiner,Edward N. Pugh,I. R. Walker,Stephen Julian,P. Monthoux,Gilbert G. Lonzarich,Andrew Huxley,I. Sheikin,Daniel Braithwaite,Jacques Flouquet +16 more
TL;DR: The observation of superconductivity on the border of ferromagnetism in a pure system, UGe 2, which is known to be qualitatively similar to the classic d-electron ferromagnets, is reported.