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Li, L; Parker, David; Babkevich, P.; Yang, Lin; Rønnow, Henrik M.; Sefat, Athena S.

doi:10.1103/physrevb.91.104511

Cited by 40 publications

(67 citation statements)

References 22 publications

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“…Broadly categorising, these superconducting materials comprise the families Bi-O-S (Tc = 4.5-6 K) [1][2][3][4][5] , LnO1−xFxBiS2 (Ln = La, Ce, Pr, Nd, Sm and Yb) (Tc = 1.9-5.4 K) [6][7][8][9][10][11][12] , and Sr1−xLnxFBiS2 (Ln = La, Ce, Pr, Nd and Sm) (Tc ~ 3 K) [13][14][15][16][17] . The parent LnOBiS2 (Ln = La, Ce and Th) and SrFBiS2 compounds are semiconducting [18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

et al. 2017

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We have synthesized two new Eu-based compounds, EuSr2Bi2S4F4 and Eu2SrBi2S4F4 which are derivatives of Eu3Bi2S4F4, an intrinsic superconductor with Tc = 1.5 K. They belong to a tetragonal structure (SG: I4/mmm, Z = 2), similar to the parent compound Eu3Bi2S4F4. Our structural and 151 Eu Mössbauer spectroscopy studies show that in EuSr2Bi2S4F4, Eu-atoms exclusively occupy the crystallographic 2a-sites. In Eu2SrBi2S4F4, 2a-sites are fully occupied by Eu-atoms and the other half of Eu-atoms and Sr-atoms together fully occupy 4e-sites in a statistical distribution. In both compounds Eu atoms occupying the crystallographic 2a-sites are in a homogeneous mixed valent state ~ 2.6 -2.7. From our magnetization studies in an applied H  9 Tesla, we infer that the valence of Eu-atoms in Eu2SrBi2S4F4 at the 2a-sites exhibits a shift towards 2+. Our XPS studies corroborate the occurrence of valence fluctuations of Eu and after Ar-ion sputtering show evidence of enhanced population of Eu 2+ -2 states. Resistivity measurements, down to 2 K suggest a semi-metallic nature for both compounds.

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Section: Introductionmentioning

confidence: 99%

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

et al. 2017

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“…A variety of closely related approaches have been subsequently proposed [62][63][64][65][66]. They all have in common that they include all the local DMFT correlations, and construct additional non-local correlations from the two-particle vertex via Feynman diagrams.…”

Section: Methodsmentioning

confidence: 99%

“…There are essentially two routes that deal with non-local correlations while keeping the local DMFT correlations at the same time: cluster [57][58][59] and diagrammatic extensions [60][61][62][63][64][65][66] of DMFT. The former have been successfully applied to the two dimensional Hubbard model and helped establishing the presence of superconductivity in this model.…”

Section: Introductionmentioning

confidence: 99%

Merging GW with DMFT and non-local correlations beyond

Tomczak¹,

Liu²,

Toschi³

et al. 2017

Eur. Phys. J. Spec. Top.

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Abstract. We review recent developments in electronic structure calculations that go beyond state-of-the-art methods such as density functional theory (DFT) and dynamical mean field theory (DMFT). Specifically, we discuss the following methods: GW as implemented in the Vienna ab initio simulation package (VASP) with the self energy on the imaginary frequency axis, GW+DMFT, and ab initio dynamical vertex approximation (DΓA). The latter includes the physics of GW, DMFT and non-local correlations beyond, and allows for calculating (quantum) critical exponents. We present results obtained by the three methods with a focus on the benchmark material SrVO 3.

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“…64,65) In this respect, diagrammatic extensions of DMFT such as the dynamical vertex approximation (DΓA) 66,67) are much more promising. In DΓA, and other related diagrammatic extensions, [68][69][70][71][72][73] first a local two-particle vertex is calculated. From this local building block, non-local Feynman diagrams are constructed through the Bethe-Salpeter 67,74) or through the parquet equations.…”

Section: Introductionmentioning

confidence: 99%

Towards ab initio Calculations with the Dynamical Vertex Approximation

et al. 2018

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While key effects of the many-body problem-such as Kondo and Mott physics-can be understood in terms of onsite correlations, non-local fluctuations of charge, spin, and pairing amplitudes are at the heart of the most fascinating and unresolved phenomena in condensed matter physics. Here, we review recent progress in diagrammatic extensions to dynamical mean-field theory for ab initio materials calculations. We first recapitulate the quantum field theoretical background behind the two-particle vertex. Next we discuss latest algorithmic advances in quantum Monte Carlo simulations for calculating such two-particle quantities using worm sampling and vertex asymptotics, before giving an introduction to the ab initio dynamical vertex approximation (AbinitioDΓA). Finally, we highlight the potential of AbinitioDΓA by detailing results for the prototypical correlated metal SrVO 3 .

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Superconductivity in semimetallicBi3O2S3

Abstract: Here we report further investigation on the thermodynamic, and transport properties, and the first 2

Cited by 40 publications

References 22 publications

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Merging GW with DMFT and non-local correlations beyond

Towards ab initio Calculations with the Dynamical Vertex Approximation

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Superconductivity in semimetallicBi3O2S3

Abstract: Here we report further investigation on the thermodynamic, and transport properties, and the first 2

Cited by 40 publications

References 22 publications

Unusual Mixed Valence of Eu in Two Materials—EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Unusual Mixed Valence of Eu in Two Materials—EuSr2Bi2S4F4 and Eu2SrBi2S4F4: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Merging GW with DMFT and non-local correlations beyond

Towards ab initio Calculations with the Dynamical Vertex Approximation

Contact Info

Product

Resources

About

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations

Unusual Mixed Valence of Eu in Two Materials—EuSr₂Bi₂S₄F₄ and Eu₂SrBi₂S₄F₄: Mössbauer and X-ray Photoemission Spectroscopy Investigations