Angle-resolved spectroscopy study of Ni-based superconductor SrNi${}_2$As${}_2$

Abstract

We performed an angle-resolved photoemission spectroscopy study of the Ni-based superconductor SrNi${}_2$As${}_2$. Electron and hole Fermi surface pockets are observed, but their different shapes and sizes lead to very poor nesting conditions. The experimental electronic band structure of SrNi${}_2$As${}_2$ is in good agreement with first-principles calculations after a slight renormalization (by a factor 1.1), confirming the picture of Hund's exchange-dominated electronic correlations decreasing with increasing filling of the $3d$ shell in the Fe-, Co- and Ni-based compounds. These findings emphasize the importance of Hund's coupling and $3d$-orbital filling as key tuning parameters of electronic correlations in transition metal pnictides.

6 pages, 5 figures. New title. Data and discussions on SrNi2P2 removed

References in corpus (15)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Coherence-incoherence crossover in the normal state of iron-oxypnictides and importance of the Hund's rule coupling
• Dynamical Mean-Field Theory within an Augmented Plane-Wave Framework: Assessing Electronic Correlations in the Iron Pnictide LaFeAsO
• Hubbard U and Hund's Exchange J in Transition Metal Oxides: Screening vs. Localization Trends from Constrained Random Phase Approximation
• A precise method for visualizing dispersive features in image plots
• Spin freezing transition and non-Fermi-liquid self-energy in a 3-orbital model
• First Order Phase Transition and Superconductivity in BaNi2As2 Single Crystals
• Superconductivity in SrNi2As2 Single Crystals
• Strong-coupling superconductivity in layered nickel-based LaO${}_{1-x}$F${}_x$NiAs
• Dynamical correlations and screened exchange on the experimental bench: spectral properties of the cobalt pnictide BaCo2As2
• Electronic band structure of BaCo${}_2$As${}_2$: a fully-doped ferropnictide with reduced electronic correlations
• Spectral properties of transition metal pnictides and chalcogenides: angle-resolved photoemission spectroscopy and dynamical mean field theory
• Tuning electronic correlations in transition metal pnictides: chemistry beyond the valence count
• Direct spectroscopic evidence for completely filled Cu $3d$ shell in BaCu${}_2$As${}_2$ and $\alpha$-BaCu${}_2$Sb${}_2$
• Camelback-shaped band reconciles heavy electron behavior with weak electronic Coulomb correlations in superconducting TlNi2Se2

Cited by in corpus (3)

• Flat band magnetism and helical magnetic order in Ni-doped SrCo${}_2$As${}_2$
• Is BaCr${}_2$As${}_2$ symmetrical to BaFe${}_2$As${}_2$ with respect to half $3d$ shell filling?
• Van Hove singularities, chemical pressure and phonons: an angle-resolved photoemission study of KFe${}_2$As${}_2$ and CsFe${}_2$As${}_2$