Magnetic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>EuFe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>determined by single-crystal neutron diffraction

Xiao, Yinguo; Su, Yixi; Meven, Martin; Mittal, R.; Kumar, C. M. N.; Chatterji, Tapan; Price, Stephen J.; Perßon, J.; Kumar, Neeraj; Dhar, S. K.; Thamizhavel, A.; Brueckel, Th.

doi:10.1103/physrevb.80.174424

Cited by 179 publications

(239 citation statements)

References 50 publications

Supporting

Mentioning

224

Contrasting

Order By: Relevance

“…It was found that the undoped parent compound undergoes antiferromagnetic (AFM) ordering in the Fe sublattice at 200 K, followed by another AFM ordering in the Eu sublattice at 20 K. [16,17,18,19] The two subsystems are hardly coupled, as evidenced from optical [20] and photoemission [21] studies. The magnetic structure of the latter AFM order had been proposed to be of A-type, [17,22] in which Eu 2+ spins algin ferromagnetically in the basal planes but antiferromagnetically along the c-axis, which was then confirmed by the magnetic resonant x-ray scattering [23] and neutron diffraction [24] experiments. By the partial substitution of Eu with K, SC over 30 K was reported in Eu 1−x K x Fe 2 As 2 .…”

Section: Introductionmentioning

confidence: 70%

Superconductivity and ferromagnetism in EuFe₂(As_1−xP_x)₂

Cao

Ren

et al. 2011

J. Phys.: Condens. Matter

108

View full text Add to dashboard Cite

Abstract. Superconductivity and ferromagnetism are two antagonistic cooperative phenomena, which makes it difficult for them to coexist. Here we demonstrate experimentally that they do coexist in EuFe 2 (As 1−x P x ) 2 with 0.2 ≤ x ≤ 0.4, in which superconductivity is associated with Fe-3d electrons and ferromagnetism comes from the long-range ordering of Eu-4f moments via Ruderman-Kittel-KasuyaYosida (RKKY) interactions.The coexistence is featured by large saturated ferromagnetic moments, high and comparable superconducting and magnetic transition temperatures, and broad coexistence ranges in temperature and field. We ascribe this unusual phenomenon to the robustness of superconductivity as well as the multi-orbital characters of iron pnictides.(Some figures in this article are in colour only in the electronic version)

show abstract

Section: Introductionmentioning

confidence: 70%

Superconductivity and ferromagnetism in EuFe₂(As_1−xP_x)₂

Cao

Ren

et al. 2011

J. Phys.: Condens. Matter

108

View full text Add to dashboard Cite

show abstract

“…The local iron moment, ≈ 1µ B [20], for Eu122 is similar to the other M 122 compounds, yet in Eu122 the Eu moments also order at low temperatures, having a local moment of nearly 7µ B . Our low temperature ARPES arXiv:0912.3434v1 [cond-mat.supr-con]…”

mentioning

confidence: 74%

Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe ₂ As ₂ , an Fe-pnictide superconductor parent compound

et al. 2010

View full text Add to dashboard Cite

Using angle resolved photoemission it is shown that the low lying electronic states of the iron pnictide parent compound EuFe2As2 are strongly modified in the magnetically ordered, low temperature, orthorhombic state compared to the tetragonal, paramagnetic case above the spin density wave transition temperature. Back-folded bands, reflected in the orthorhombic/ anti-ferromagnetic Brillouin zone boundary hybridize strongly with the non-folded states, leading to the opening of energy gaps. As a direct consequence, the large Fermi surfaces of the tetragonal phase fragment, the low temperature Fermi surface being comprised of small droplets, built up of electron and hole-like sections. These high resolution ARPES data are therefore in keeping with quantum oscillation and optical data from other undoped pnictide parent compounds. The electronic structure and properties of the newly discovered iron-pnictide superconductors [1] are a focus of much research. A central theme is the understanding of the origins of the magnetic ordering and its possible interplay with superconductivity. The characteristics of the low-temperature, orthorhombic, antiferromagnetic (AFM) phase have been experimentally determined, for example for the undoped 122 -parent compounds, M Fe 2 As 2 (with M = Ca, Sr, Ba, Eu. . . ). A common proposition is that the magnetism is of an itinerant, spin density wave (SDW) type, connected to nesting of the warped cylindrical Fermi surfaces (FS's) centered at the (0, 0) (Γ) and (π, π) points (X) of the tetragonal Brillouin zone (BZ) [2]. Such an SDW would have dramatic consequences for the band structure and Fermi surface, leading to reconstruction, the opening of gaps and major Fermi surface depletion. Recently, quantum oscillation (QO) experiments have presented evidence for Fermi surfaces comprising small pocketsdue to the effects of the SDW order -in SrFe 2 As 2 [3] and BaFe 2 As 2 [4]. Both studies find the existence of three distinct orbits, with FS areas of only 0.3%, 0.6% and 1.5% of the tetragonal BZ (compared to a total FS area larger than 20% in the tetragonal phase). In addition, the opening of gaps as well as a dramatic reduction of the free charge carrier density upon entering the orthorhombic AFM state has been concluded from optical conductivity measurements [5,6]. Given that a FS-nesting-driven SDW is rooted in k-space, it is of great importance whether the SDW 'fingerprints' of reconstruction, gapping and FS depletion really take place in the E(k)-space hosting the electronic states of these materials. Angle-resolved photoemission (ARPES) is a powerful probe of such issues, and consequently there have been numerous studies of the parent compounds of the pnictide superconductors using ARPES. Early studies were unable to detect significant changes below the magnetic ordering temperature [7,8]. More recently, ARPES studies have shown the existence of small, additional FS pockets (either hole or electron-like) around the (0, 0) or (π, π) point [9,10,11,12], and a detailed temperature-dependent...

show abstract

“…refs. [47][48][49], albeit with a short-range order. This mechanism opens an additional relaxation channel for QP decay along ϕ = 0°.…”

Section: Resultsmentioning

confidence: 99%

Unveiling the hidden nematicity and spin subsystem in FeSe

et al. 2017

View full text Add to dashboard Cite

The nematic order (nematicity) is considered as one of the essential ingredients to understand the mechanism of Fe-based superconductivity. In most Fe-based superconductors (pnictides), nematic order is reasonably close to the antiferromagnetic order. In FeSe, in contrast, a nematic order emerges below the structure phase transition at T s = 90 K with no magnetic order. The case of FeSe is of paramount importance to a universal picture of Fe-based superconductors. The polarized ultrafast spectroscopy provides a tool to probe simultaneously the electronic structure and the magnetic interactions through quasiparticle dynamics. Here we show that this approach reveals both the electronic and magnetic nematicity below and, surprisingly, its fluctuations far above T s to at least 200 K. The quantitative pump-probe data clearly identify a correlation between the topology of the Fermi surface and the magnetism in all temperature regimes, thus providing profound insight into the driving factors of nematicity in FeSe and the origin of its uniqueness.

show abstract

Magnetic structure ofEuFe2As2determined by single-crystal neutron diffraction

Cited by 179 publications

References 50 publications

Superconductivity and ferromagnetism in EuFe₂(As_1−xP_x)₂

Superconductivity and ferromagnetism in EuFe₂(As_1−xP_x)₂

Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe ₂ As ₂ , an Fe-pnictide superconductor parent compound

Unveiling the hidden nematicity and spin subsystem in FeSe

Contact Info

Product

Resources

About

Magnetic structure ofEuFe2As2determined by single-crystal neutron diffraction

Cited by 179 publications

References 50 publications

Superconductivity and ferromagnetism in EuFe2(As1−xPx)2

Superconductivity and ferromagnetism in EuFe2(As1−xPx)2

Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe 2 As 2 , an Fe-pnictide superconductor parent compound

Unveiling the hidden nematicity and spin subsystem in FeSe

Contact Info

Product

Resources

About

Superconductivity and ferromagnetism in EuFe₂(As_1−xP_x)₂

Superconductivity and ferromagnetism in EuFe₂(As_1−xP_x)₂

Droplet-like Fermi surfaces in the anti-ferromagnetic phase of EuFe ₂ As ₂ , an Fe-pnictide superconductor parent compound