Magnetic moments and x-ray photoelectron spectroscopy splittings in Fe<i>3s</i>core levels of materials containing Fe

Vanacker, Jf; Stadnik, Z. M.; Fuggle, J. C.; Hoekstra, H.J.W.M.; Buschow, K.H.J.; Stroink, G.

doi:10.1103/physrevb.37.6827

Cited by 126 publications

(56 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fe 2p 3/2 signal shown in Fig. 1(a) exhibits a highly asymmetric peak around 707 eV binding energy typical for metallic Fe-like behavior -the asymmetry arises due to the screening of the core holes in the photoemission final states and associated low energy excitations 13,14 . As 3d spectra shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

Complex temperature evolution of the electronic structure of CaFe2As2

Adhikary

Biswas

Sahadev

et al. 2014

Journal of Applied Physics

View full text Add to dashboard Cite

We investigate the electronic structure of CaFe 2 As 2 using high resolution photoemission spectroscopy. Experimental results exhibit three energy bands crossing the Fermi level making hole pockets around the Γ-point. Temperature variation reveal a gradual shift of an energy band away from the Fermi level with the decrease in temperature in addition to the spin density wave (SDW) transition induced Fermi surface reconstruction of the second energy band across SDW transition temperature. The hole pocket in the former case eventually disappears at lower temperatures while the hole Fermi surface of the third energy band possessing finite p orbital character survives till the lowest temperature studied. These results reveal signature of a complex charge redistribution among various energy bands as a function of temperature that might be associated to the exotic properties of this system.

show abstract

Section: Resultsmentioning

confidence: 97%

Complex temperature evolution of the electronic structure of CaFe2As2

Adhikary

Biswas

Sahadev

et al. 2014

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Fe exchange multiplets, demonstrating strong local fluctuating magnetism, were found in non-magnetic superconducting CeFeAsO 0.89 F 0.11 by x-ray absorption spectroscopy. [98] The other case where this is observed in a non-magnetic Fe compound is NbFe 2 , [99] which is an itinerant magnetic in close proximity to a quantum critical point. [100] Furthermore, the scattering rate indicated by optics and by transport is high in the normal state and decreases strongly at the SDW onset.…”

Section: Magnetismmentioning

confidence: 99%

Electronic structure of Fe-based superconductors

Singh

2009

Physica C: Superconductivity

140

114

View full text Add to dashboard Cite

show abstract

“…Multiplying the S V values by the spin factor g = 2, one correspondingly obtains the values for the Fe LSM. We follow this same approach given the itinerant character of the Fe-HTSC (See Supplementary Online Text) [26,27,28,29,30,31,32,33,34,35,36,37].The values of ΔE 3s are obtained with a two-component fit of the Fe 3s spectra, with uncertainty being estimated to be ± 100 meV and ± 50 meV for the HAXPES and PES spectra, respectively.The values of ΔE 3s , the corresponding S V values, and the inferred values of the LSM are shown 6 in Fig. 2.…”

mentioning

confidence: 99%

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(Fe
Vilmercati
¹
,
Fedorov
²
,
Bondino
³

et al. 2012
Phys. Rev. B

View full text Add to dashboard Cite

A direct and element-specific measurement of the local Fe spin moment has been provided by analyzing the Fe 3s core level photoemission spectra in the parent and optimally doped CeFeAsO 1-x F x (x = 0, 0.11) and Sr(Fe 1-x Co x ) 2 As 2 (x = 0, 0.10) pnictides. The rapid time scales of the photoemission process allowed the detection of large local spin moments fluctuating on a 10 -15 s time scale in the paramagnetic, anti-ferromagnetic and superconducting phases, indicative of the occurrence of ubiquitous strong Hund's magnetic correlations. The magnitude of the spin moment is found to vary significantly among different families, 1.3  B in CeFeAsO and 2.1  B in SrFe 2 As 2 . Surprisingly, the spin moment is found to decrease considerably in the optimally doped samples, 0.9 B in CeFeAsO 0.89 F 0.11 and 1.3 B in Sr(Fe 0.9 Co 0.1 ) 2 As 2 . The strong variation of the spin moment against doping and material type indicates that the spin moments and the motion of itinerant electrons are influenced reciprocally in a self-consistent fashion, reflecting the strong competition between the antiferromagnetic super-exchange interaction among the spin moments and the kinetic energy gain of the itinerant electrons in the presence of a strong Hund's coupling. By describing the evolution of the magnetic correlations concomitant with the appearance of superconductivity, these results constitute a fundamental step toward attaining a correct description of the microscopic mechanisms shaping the electronic properties in the pnictides, including magnetism and high temperature superconductivity.

show abstract

Magnetic moments and x-ray photoelectron spectroscopy splittings in Fe3score levels of materials containing Fe

Cited by 126 publications

References 65 publications

Complex temperature evolution of the electronic structure of CaFe2As2

Complex temperature evolution of the electronic structure of CaFe2As2

Electronic structure of Fe-based superconductors

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(Fe
Vilmercati
¹
,
Fedorov
²
,
Bondino
³

et al. 2012
Phys. Rev. B

Contact Info

Product

Resources

About

Magnetic moments and x-ray photoelectron spectroscopy splittings in Fe3score levels of materials containing Fe

Cited by 126 publications

References 65 publications

Complex temperature evolution of the electronic structure of CaFe2As2

Complex temperature evolution of the electronic structure of CaFe2As2

Electronic structure of Fe-based superconductors

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(FeVilmercati1, Fedorov2, Bondino3 et al. 2012Phys. Rev. B

Contact Info

Product

Resources

About

Itinerant electrons, local moments, and magnetic correlations in the pnictide superconductors CeFeAsO1−xFxand Sr(Fe
Vilmercati
¹
,
Fedorov
²
,
Bondino
³

et al. 2012
Phys. Rev. B