Quaternary borocarbides: Relatively high T intermetallic superconductors and magnetic superconductors

Mazumdar, Chandan; Nagarajan, Radhakrishnan

doi:10.1016/j.physc.2015.02.034

Cited by 19 publications

(12 citation statements)

References 127 publications

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“…One interesting (reverse) example of magnetic vs non-magnetic dopants and their effect on Tc in conventional and UcS is the case of DyNi2B2C, believed to be a conventional BCS superconductor [15]. This material is a magnetic superconductor, Tc=6 K, inside an antiferromagnetic phase, TN=11 K where non-magnetic impurities (e. g. Y on the Dy site) suppress Tc at almost the same rate as magnetic (Gd) substitution [15].…”

Section: Superconductivity Is Extremely Sensitive To Impurities Non-mentioning

confidence: 99%

“…This material is a magnetic superconductor, Tc=6 K, inside an antiferromagnetic phase, TN=11 K where non-magnetic impurities (e. g. Y on the Dy site) suppress Tc at almost the same rate as magnetic (Gd) substitution [15].…”

Section: Superconductivity Is Extremely Sensitive To Impurities Non-mentioning

confidence: 99%

“…One example of this behavior is in YNi2B2C, where C(H,) data were measured at 2 K by Park et al [76]. In a recent review [15] of the quaternary borocarbide superconductors, Mazumdar and Nagarajan argue based on a broad range of data, including isotope effect, that YNi2B2C is a conventional, electron-phonon coupled superconductor. Another way to have the measurement of C(H, ) be misleading is to measure at too high a temperature, before the nodal and antinodal directions become inverted to their correct angular locations.…”

Section: C(h)/(h) Shows Evidence For Nodal Behavior But Can Be mentioning

confidence: 99%

“…We focus on the 9 classes of superconductors for which there is substantial evidence indicating UcS (with a discussion of three additional emerging, possible UcS classes in section 13), and omit the classes where the current consensus is "uncertain" (e. g. for the borocarbides, see ref. [15] for discussion).…”

Section: Introductionmentioning

confidence: 99%

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Unconventional superconductivity

Stewart

2017

Advances in Physics

212

165

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Abstract:"Conventional" superconductivity, as used in this review, refers to electron-phonon coupled superconducting electron pairs described by BCS theory. Unconventional superconductivity refers to superconductors where the Cooper pairs are not bound together by phonon-exchange but instead by exchange of some other kind, e. g. spin fluctuations in a superconductor with magnetic order either coexistent or nearby in the phase diagram. Such unconventional superconductivity has been known experimentally since heavy fermion CeCu2Si2, with its strongly correlated 4f electrons, was discovered to superconduct below 0.6 K in 1979. Since the discovery of unconventional superconductivity in the layered cuprates in 1986, the study of these materials saw Tc jump to 164 K by 1994. Further progess in high temperature superconductivity would be aided by understanding the cause of such unconventional pairing. This review compares the fundamental properties of 9 unconventional superconducting classes of materialsfrom 4f-electron heavy fermions to organic superconductors to classes where only three known members exist to the cuprates with over 200 examples -with the hope that common features will emerge to help theory explain (and predict!) these phenomena. In addition, three new emerging classes of superconductors (topological, interfacial -e. g. FeSe on SrTiO3, and H2S under high pressure) are briefly covered, even though their "conventionality" is not yet fully determined.

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Section: Superconductivity Is Extremely Sensitive To Impurities Non-mentioning

confidence: 99%

Section: Superconductivity Is Extremely Sensitive To Impurities Non-mentioning

confidence: 99%

Section: C(h)/(h) Shows Evidence For Nodal Behavior But Can Be mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unconventional superconductivity

Stewart

2017

Advances in Physics

212

165

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“…Two decades later, during the 1990s, the rare-earth nickel borocarbides RE Ni 2 B 2 C have been added to the family of magnetic superconductors, see reviews [15,16,29,30]. Distinctive features of these materials significantly expanded and enriched the field of coexistence of superconductivity and magnetic order.…”

Section: Introductionmentioning

confidence: 99%

Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling

Koshelev

2019

Phys. Rev. B

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Motivated by the recent discovery of helical magnetic structure in RbEuFe4As4, we investigate interlayer ordering of magnetic moments in materials composed of spatially-separated superconducting and ferromagnetically-aligned layers. We consider the interplay between the normal and superconducting indirect exchange interaction mediated by tunneling between the conducting layers. We elaborate a recipe to evaluate the normal interlayer interaction via two-dimensional density of states of an isolated layer and demonstrate that for bands with small fillings, such interaction is typically ferromagnetic and short-range. The nearest-layer interaction is proportional to the ratio of the interlayer hopping and in-plane band width squared. On the other hand, the superconducting contribution always gives antiferromagnetic interaction and may extend over several layers when the interlayer hopping energy exceeds the superconducting gap. The frustration caused by the interplay between the normal and superconducting parts may lead to spiral ground-state magnetic configuration. The four-fold in-plane anisotropy may lock the rotation angle between the moments in the neighboring layers to 90 • , as it was observed in RbEuFe4As4. arXiv:1910.01609v3 [cond-mat.supr-con]

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Rare–Earths–Nickel–Boron Compounds

Burzo¹

2023

Rare Earths-Transition Metals-Boron Compounds

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Quaternary borocarbides: Relatively high T intermetallic superconductors and magnetic superconductors

Cited by 19 publications

References 127 publications

Unconventional superconductivity

Unconventional superconductivity

Helical structures in layered magnetic superconductors due to indirect exchange interactions mediated by interlayer tunneling

Rare–Earths–Nickel–Boron Compounds

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