Direct evidence of uneven 
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 orbital occupation in the superconducting state of iron pnictide

Rybicki, Damian; Sikora, Marcin; Stȩpień, Joanna; Gondek, Ł.; Goc, Kamil; Strączek, Tomasz; Jurczyszyn, M.; Kapusta, Cz.; Bukowski, Z.; Babij, M.; Matusiak, Marcin; Zając, M.

doi:10.1103/physrevb.102.195126

Cited by 5 publications

(5 citation statements)

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“…Our experimental results then imply that the d xz orbital becomes more coherent than the d yz orbital. X-ray linear dichroism (XLD) experiments inside the nematic state found a larger occupation of the d xz orbital driving it further away from half filling [44,45] in agreement with our interpretation. The coherent spectral weight will be redistributed to incoherent Hubbard-like bands located at higher binding energy [46].…”

Section: Discussionsupporting

confidence: 89%

Anisotropic quasiparticle coherence in nematic BaFe$_2$As$_2$ studied with strain-dependent ARPES

Pfau,

Chen,

Hashimoto

et al. 2021

Preprint

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The hallmark of nematic order in iron-based superconductors is a resistivity anisotropy but it is unclear to which extent quasiparticle dispersions, lifetimes and coherence contribute. While the lifted degeneracy of the Fe dxz and dyz dispersions has been studied extensively, only little is known about the two other factors. Here, we combine in situ strain tuning with ARPES and study the nematic response of the spectral weight in BaFe2As2. The symmetry analysis of the ARPES spectra demonstrates that the dxz band gains quasiparticle spectral weight compared to the dyz band for negative antisymmetric strain ∆ yy suggesting the same response inside the nematic phase. Our results are compatible with a different coherence of the dxz and dyz orbital within a Hund's metal picture. We also discuss the influence of orbital mixing.

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Section: Discussionsupporting

confidence: 89%

Anisotropic quasiparticle coherence in nematic BaFe$_2$As$_2$ studied with strain-dependent ARPES

Pfau,

Chen,

Hashimoto

et al. 2021

Preprint

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“…3 Exemplary XAS spectra as measured with linearly polarized X-ray beam for both NiO (111) (left panel) and CoO(111) (right panel) antiferromagnetic films epitaxially grown on Fe(110)/W(110). The direction of the incoming X-rays is parallel to the sample normal and its linear polarization is parallel either to the Fe [1][2][3][4][5][6][7][8][9][10] or to Fe[001] in-plane direction including material science, surface physics, magnetism, and biological systems. The most successful projects were focused on charge storage materials related to Li-or Na-based batteries [6], superconductors [7], and magnetism of the multilayer systems [8][9][10][11][12][13].…”

Section: Present Status and Scientific Highlightsmentioning

confidence: 99%

“…Systematic studies prove that in both studied cases ferromagnetic sublayer plays a dominant role and determines the magnetic state of the neighbouring antiferromagnet (AFM); however, different interaction mechanisms are involved. In CoO/Fe bilayers, the AFM spins are frozen and their orientation is imprinted by magnetization of the Fe layer when the system passes the Neel temperature of CoO [7,9]. For NiO/Fe bilayers, the AFM spins are rotatable and always follow the reorientation of Fe magnetization, which can be controlled by an external magnetic field or via the temperature and thickness-driven spin reorientation transition of Fe(110).…”

Section: Present Status and Scientific Highlightsmentioning

confidence: 99%

SOLARIS National Synchrotron Radiation Centre in Krakow, Poland

et al. 2023

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The SOLARIS synchrotron located in Krakow, Poland, is a third-generation light source operating at medium electron energy. The first synchrotron light was observed in 2015, and the consequent development of infrastructure lead to the first users’ experiments at soft X-ray energies in 2018. Presently, SOLARIS expands its operation towards hard X-rays with continuous developments of the beamlines and concurrent infrastructure. In the following, we will summarize the SOLARIS synchrotron design, and describe the beamlines and research infrastructure together with the main performance parameters, upgrade, and development plans.

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“…Before we proceed to XAS results we briefly discuss features of crystal structures derived from XRD 8 , 9 , 15 . In Fig.…”

Section: Resultsmentioning

confidence: 99%

“…At room temperature the crystal structure of 122 compounds can be indexed by the tetragonal I 4/ mmm space group (No. 139) 9 , 15 . In the unit cell there is only one type of Eu, Fe and As site with Eu atoms lying in a plane separated by As-Fe layers.…”

Section: Resultsmentioning

confidence: 99%

Effects of Ni/Co doping on structural and electronic properties of 122 and 112 families of Eu based iron pnictides

Stępień,

Rybicki,

Sikora

et al. 2023

Sci Rep

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Superconductivity in high-temperature superconductors such as cuprates or iron pnictides is typically achieved by hole or electron doping and it is of great interest to understand how doping affects their properties leading to superconductivity. To study it we conducted Fe and As K edge x-ray absorption spectroscopy measurements on several electron doped compounds from the 112 and 122 family of Eu-based iron pnictides. XANES and EXAFS results confirm that dopants are located at expected sites. For both families we found an electron charge redistribution between As and Fe occurring with doping. The changes it caused are stronger in the 112 family and they are bigger at As sites, which indicates that doped charges are predominantly localized on the dopant site. However, the results obtained do not provide clues why Ni doping in 122 family does not lead to occurrence of superconductivity.

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Direct evidence of uneven dxz and dyz orbital occupation in the superconducting state of iron pnictide

Cited by 5 publications

References 50 publications

Anisotropic quasiparticle coherence in nematic BaFe$_2$As$_2$ studied with strain-dependent ARPES

Anisotropic quasiparticle coherence in nematic BaFe$_2$As$_2$ studied with strain-dependent ARPES

SOLARIS National Synchrotron Radiation Centre in Krakow, Poland

Effects of Ni/Co doping on structural and electronic properties of 122 and 112 families of Eu based iron pnictides

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