Superconducting Properties of Rhenium, Ruthenium, and Osmium

Hülm, J. K.; Goodman, B.B.

doi:10.1103/physrev.106.659

Cited by 66 publications

(15 citation statements)

References 24 publications

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“…The magnetization M ( H ) exhibited a sharp jump at around H = 170 ± 30 Oe, indicating that the unstrained sample was a type-I superconductor. The results are consistent with those reported by Hulm and Goodman9.…”

Section: Resultssupporting

confidence: 93%

“…From our experience, we have found that a Re gasket often has a T c above 2.0 K, and T c depends on the degree of prior treatment (that is, it is related to the magnitude of internal strain in the gasket). Indeed, this phenomenon is the same as the strain effect reported by Hulm and Goodman9. Given the above background, we systematically study the effect of shear strain on the superconductivity of Re over a wide strain range.…”

supporting

confidence: 64%

“…According to an earlier study of Re by Hulm and Goodman in 1957, an arc-melted powder without strain has a sharp superconducting transition at T c = 1.70 K9. The Meissner effect reveals the magnetic-field-dependent characteristics of typical type-I superconductors.…”

mentioning

confidence: 94%

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Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain

Mito

Matsui

Tsuruta

et al. 2016

Sci Rep

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Finding a physical approach for increasing the superconducting transition temperature (Tc) is a challenge in the field of material science. Shear strain effects on the superconductivity of rhenium were investigated using magnetic measurements, X-ray diffraction, transmission electron microscopy, and first-principles calculations. A large shear strain reduces the grain size and simultaneously expands the unit cells, resulting in an increase in Tc. Here we show that this shear strain approach is a new method for enhancing Tc and differs from that using hydrostatic strain. The enhancement of Tc is explained by an increase in net electron–electron coupling rather than a change in the density of states near the Fermi level. The shear strain effect in rhenium could be a successful example of manipulating Bardeen–Cooper–Schrieffer-type Cooper pairing, in which the unit cell volumes are indeed a key parameter.

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Section: Resultssupporting

confidence: 93%

supporting

confidence: 64%

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Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain

Mito

Matsui

Tsuruta

et al. 2016

Sci Rep

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“…While these interactions can have important consequences on magnetic impurities on a superconductor (where they compete only with the Ruderman-Kittel-Kasuya-Yosida interaction), the direct magnetic exchange interaction of strength J will be dominant in the case of a magnetic film covering the superconductor. Referring again to a Co/Ru(0001) bilayer, the superconducting transition temperature of ruthenium is T c = 470 mK [64], corresponding to ∆(T = 0) ≈ π e γ k B T c = 0.07 meV, which is negligible compared to J = 13.1 meV [48].…”

Section: Merger Of Single-winding Skyrmions In Chiral Magnetsmentioning

confidence: 99%

Majorana bound states in magnetic skyrmions imposed onto a superconductor

2019

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We consider a superconducting film exchange-coupled to a close-by chiral magnetic layer and study how magnetic skyrmions can induce the formation of Majorana bound states (MBS) in the superconductor. Inspired by a proposal by Yang et al. [Phys. Rev. B 93, 224505 (2016)], which suggested MBS in skyrmions of even winding number, we explore whether such skyrmions could result from a merger of ordinary skyrmions. We conclude that the formation of higher-winding skyrmions is not realistic in chiral magnets. Subsequently, we present a possibility to obtain MBS from realistic skyrmions of winding number one, if a skyrmion-vortex pair is formed instead of a bare skyrmion. Specifically, we show that MBS are supported in a pair of a circular skyrmion and a vortex which both have a winding number of one. We back up our analytical prediction with results from numerical diagonalization and obtain the spatial profile of the MBS. In light of recent experimental progress on the manipulation of skyrmions, such systems are promising candidates to achieve direct spatial control of MBS. arXiv:1904.04177v2 [cond-mat.supr-con]

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“…Increases of T, after cold work have also been found in Re [33,341 (1 "K) where annealing gives the original value back. Neutron irradiation at 78 "K L351 also gives an increase in T, of Re.…”

Section: In This Expression 8mentioning

confidence: 71%

The Influence of Dislocations on Superconductivity

Gurp

Ooijen

1966

J. Phys. Colloques

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RBsumB.-L'article passe en revue les effets des dislocations sur les propriktks des supraconducteurs. On ktablit une distinction entre les effets du libre parcours moyen et les effets hors d'kquilibre. Les premiers donnent lieu & une diminution ou & une augmentation de la tedpQature critique, selon l'ampleur de l'anisotropie du (c gap n d'knergie ou des contraintes internes prksentes dans le supraconducteur. Un autre effet du libre parcours moyen est l'augmentation des champs critiques superieurs. Des effets hors d'kquilibre sont engendr6s dans un champ magnktique par l'interaction entre let. dkfauts et les lignes de force dans l'6tat mixte du supraconducteur de deuxieme espkce. Les lignes de force peuvent dtre bloquks aux dkfauts de structure dans le supraconducteur. L'article expose les propriktks de ce blocage pour trois types de structures : 1) une rkpartition uniforme des dislocations, 2) une rkpartition hetkrogene, comme dans le cas des parois de polygonisation ou d'une structure cellulaire et 3) d'importantes heterog6nCitks bidimensionnelles comme dans les structures fibreuses ou les joints de grains. Les auteurs sont d'avis que le blocage croft en importance dans cet ordre.

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Superconducting Properties of Rhenium, Ruthenium, and Osmium

Cited by 66 publications

References 24 publications

Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain

Large enhancement of superconducting transition temperature in single-element superconducting rhenium by shear strain

Majorana bound states in magnetic skyrmions imposed onto a superconductor

The Influence of Dislocations on Superconductivity

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