Conventional magnetic superconductors

Wolowiec, Christian; White, B. D.; Maple, M. B.

doi:10.1016/j.physc.2015.02.050

Cited by 43 publications

(43 citation statements)

References 151 publications

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“…[99][100][101][102][103] The compounds are long range magnetic ordered for RE = Gd, Tb, Dy, Ho, Er, and Tm. And the superconductivity is observed for RE = Y, Lu, Dy, Ho, Er and Tm.…”

Section: Magnetic Properties and Mce In Reni 2 B 2 C Superconductorsmentioning

confidence: 99%

“…[101][102][103] The coexistence and competition of magnetism and superconductivity in these compounds have been systematically investigated experimentally and theoretically. [99][100][101][102][103] In recent years, we have further investigated the MCE in parent and doped RENi 2 B 2 C superconductors. [104][105][106][107] The main achievements will be shown in the following sections.…”

Section: Magnetic Properties and Mce In Reni 2 B 2 C Superconductorsmentioning

confidence: 99%

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Review of magnetic properties and magnetocaloric effect in the intermetallic compounds of rare earth with low boiling point metals

Li¹

2016

Chinese Phys. B

140

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Abstract:The magnetocaloric effect (MCE) in many rare earth (RE) based intermetallic compounds has been extensively investigated during last two decades, not only due to their potential applications for magnetic refrigeration but also for better understanding of the fundamental problems of the materials. This paper reviews our recent progress of magnetic properties and MCE in some binary or ternary intermetallic compounds of RE with low boiling point metal(s) (Zn, Mg, and Cd). Some of them are exhibiting promising MCE properties which make them also attractive for low temperature magnetic refrigeration. Characteristics of the magnetic transition, origin of large MCE as well as the potential application of these compounds were thoroughly discussed. Additionally, a brief review of the magnetic and magnetocaloric properties in the quaternary rare earth nickel boroncarbides RENi 2 B 2 C superconductors is also presented.

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“…[99][100][101][102][103] The compounds are long range magnetic ordered for RE = Gd, Tb, Dy, Ho, Er, and Tm. And the superconductivity is observed for RE = Y, Lu, Dy, Ho, Er and Tm.…”

Section: Magnetic Properties and Mce In Reni 2 B 2 C Superconductorsmentioning

confidence: 99%

Section: Magnetic Properties and Mce In Reni 2 B 2 C Superconductorsmentioning

confidence: 99%

Review of magnetic properties and magnetocaloric effect in the intermetallic compounds of rare earth with low boiling point metals

Li¹

2016

Chinese Phys. B

140

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“…It was not until late 1970s that both SC and FM were observed in ErRh 4 B 4 , but SC disappears when the Er magnetic ordering sets in [3]. Since then, a few 'conventional magnetic superconductors' were discovered [4], in which SC and localmoment FM (or more frequently, other types of magnetic orderings with ferromagnetic components) casually coexist in certain temperature and magnetic regimes. Such materials were earlier called FMSCs [2], and this terminology was also employed for the uranium compounds UGe 2 , URuGe and UCoGe that are superconducting well below their Curie temperatures [5].…”

Section: Introductionmentioning

confidence: 99%

A new ferromagnetic superconductor: CsEuFe4As4

Liu

Qian

et al. 2016

Science Bulletin

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Superconductivity (SC) and ferromagnetism (FM) are in general antagonistic, which makes their coexistence very rare. Following our recent discovery of robust coexistence of SC and FM in RbEuFe4As4 [Y. Liu et al., arXiv: 1605.04396 (2016)], here we report another example of such a coexistence in its sister compound CsEuFe4As4, synthesized for the first time. The new material exhibits bulk SC at 35.2 K and Eu 2+ -spin ferromagnetic ordering at 15.5 K, demonstrating that it is a new robust ferromagnetic superconductor.

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“…Note that the spin-tilting angle (∼20 • from the c axis, as detected by Mössbauer measurements[2]) coincides with the direction that connects the interlayer next-nearest (NN) Eu atoms because of the body-centered Eu sublattice. To clarify whether the Eu-sublattice type is relevant to Eu spin orientations, it is desirable to study a related material system in which Eu atoms form a primitive tetragonal lattice.Local-moment FM and spin-singlet SC are known to be mutually incompatible [20][21][22], which makes their coexistence (hereafter abbreviated as FM+SC) very rare [23]. The FM+SC phenomenon observed in FeSCs has been ascribed to the multi-orbital character as well as the robustness of superconductivity against magnetic fields [10,24].…”

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confidence: 99%

Superconductivity and ferromagnetism in hole-dopedRbEuFe4As4

et al. 2016

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We discover a robust coexistence of superconductivity and ferromagnetism in an iron arsenide RbEuFe4As4. The new material crystallizes in an intergrowth structure of RbFe2As2 and EuFe2As2, such that the Eu sublattice turns out to be primitive instead of being body-centered in EuFe2As2. The FeAs layers, featured by asymmetric As coordinations, are hole doped due to charge homogenization. Our combined measurements of electrical transport, magnetization and heat capacity unambiguously and consistently indicate bulk superconductivity at 36.5 K in the FeAs layers and ferromagnetism at 15 K in the Eu sublattice. Interestingly, the Eu-spin ferromagnetic ordering belongs to a rare third-order transition, according to the Ehrenfest classification of phase transition. We also identify an additional anomaly at ∼ 5 K, which is possibly associated with the interplay between superconductivity and ferromagnetism.further revised the electronic phase diagram because of the discovery of a reentrant spin glass state. Recent x-ray resonant magnetic scattering[3] and neutron scattering[4] experiments however indicated long-range ferromagnetic orderings for Eu spins in superconducting EuFe 2 (As 1−x P x ) 2 with x = 0.19 and 0.15, respectively. It was demonstrated that the Eu spins align exactly along the c axis, in contradiction to the spin-canting scenario. So far, this discrepancy remains unresolved. Note that the spin-tilting angle (∼20 • from the c axis, as detected by Mössbauer measurements[2]) coincides with the direction that connects the interlayer next-nearest (NN) Eu atoms because of the body-centered Eu sublattice. To clarify whether the Eu-sublattice type is relevant to Eu spin orientations, it is desirable to study a related material system in which Eu atoms form a primitive tetragonal lattice.Local-moment FM and spin-singlet SC are known to be mutually incompatible [20][21][22], which makes their coexistence (hereafter abbreviated as FM+SC) very rare [23]. The FM+SC phenomenon observed in FeSCs has been ascribed to the multi-orbital character as well as the robustness of superconductivity against magnetic fields [10,24]. On the one hand, the zero-temperature upper critical magnetic field, H c2 (0), of FeSCs is typically higher than 50 T [25,26], which is large enough to fight the internal exchange field that is comparable to the hyperfine field on the Eu nucleus (∼ 25 T) [2]. On the other hand, the Eu-spin FM can be satisfied even in the presence of SC, because the Fe-3d multi-orbitals enable both superconducting pairing (dominated by the d yz and d zx electrons [27]) and the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction between Eu local moments. The RKKY interaction can be mediated arXiv:1605.04396v3 [cond-mat.supr-con]

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Conventional magnetic superconductors

Cited by 43 publications

References 151 publications

Review of magnetic properties and magnetocaloric effect in the intermetallic compounds of rare earth with low boiling point metals

Review of magnetic properties and magnetocaloric effect in the intermetallic compounds of rare earth with low boiling point metals

A new ferromagnetic superconductor: CsEuFe4As4

Superconductivity and ferromagnetism in hole-dopedRbEuFe4As4

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