Journal ArticleDOI
Theory of the upper critical field in layered superconductors
TLDR
In this article, the upper critical field in layered superconductors is calculated from a microscopic theory in which the electrons are assumed to propagate freely within the individual layers subject to scattering off impurities and to propagate via tunneling between the layers.Abstract:
The upper critical field ${H}_{c2}$ in layered superconductors is calculated from a microscopic theory in which the electrons are assumed to propagate freely within the individual layers subject to scattering off impurities and to propagate via tunneling between the layers. For the magnetic field parallel to the layers, there is a temperature ${T}^{*}l{T}_{c}$ below which the normal cores of the vortices fit between the metallic layers, removing the orbital effects as a mechanism for the quenching of superconductivity in the individual layers. In this temperature regime, ${H}_{c2\ensuremath{\parallel}}$ is thus determined by the combined effects of Pauli paramagnetism and spin-orbit scattering, and for sufficiently strong spin-orbit scattering rates, ${H}_{c2\ensuremath{\parallel}}(T=0)$ can greatly exceed the Chandrasekhar-Clogston Pauli limiting field ${H}_{P}$. This unusual behavior is found to be most pronounced in the dirty limit for the electron propagation within the layers and when the electrons scatter many times in a given layer before tunneling to an adjacent layer. Our results are also discussed in light of the available experimental data.read more
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Unconventional superconductivity in magic-angle graphene superlattices
Yuan Cao,Valla Fatemi,Shiang Fang,Kenji Watanabe,Takashi Taniguchi,Efthimios Kaxiras,Pablo Jarillo-Herrero +6 more
TL;DR: The realization of intrinsic unconventional superconductivity is reported—which cannot be explained by weak electron–phonon interactions—in a two-dimensional superlattice created by stacking two sheets of graphene that are twisted relative to each other by a small angle.
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Ising pairing in superconducting NbSe2 atomic layers
Xiaoxiang Xi,Zefang Wang,Weiwei Zhao,Ju-Hyun Park,Kam Tuen Law,Helmuth Berger,László Forró,Jie Shan,Kin Fai Mak +8 more
TL;DR: In this article, the superconducting properties of NbSe2 as it approaches the monolayer limit are investigated by means of magnetotransport measurements, uncovering evidence of spin-momentum locking.
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The flux-line lattice in superconductors
TL;DR: In this article, the authors describe the properties of the triangular flux-line lattice (FLL), which is more or less perturbed by material inhomogeneities that pin the flux lines, and also by thermal fluctuations.
Journal ArticleDOI
The Flux-Line Lattice in Superconductors
TL;DR: In this article, the authors describe the properties of the triangular flux-line lattice (FLL), which is more or less perturbed by material inhomogeneities that pin the flux lines and also by thermal fluctuations.
Journal ArticleDOI
Evidence for two-dimensional Ising superconductivity in gated MoS2
Jianming Lu,Oleksandr Zheliuk,Inge Leermakers,Noah F. Q. Yuan,Uli Zeitler,Kam Tuen Law,Jianting Ye +6 more
TL;DR: This study provides experimental evidence of an Ising superconductor, in which spins of the pairing electrons are strongly pinned by an effective Zeeman field.