Magnetic structure of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi>Eu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>moments in superconducting<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>EuFe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:msub><mml:mi>As</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml

Nandi, S.; Jin, Wentao; Xiao, Yinguo; Su, Yixi; Price, Stephen J.; Schmidt, W.; Schmalzl, K.; Chatterji, Tapan; Jeevan, H. S.; Gegenwart, P.; Brückel, Thomas

doi:10.1103/physrevb.90.094407

Cited by 40 publications

(39 citation statements)

References 36 publications

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“…Such coexistence of strong ferromagentism and superconducivity was also observed in other doped EuFe 2 As 2 compounds including EuFe 2 (As 1−x P x ) 2 , 10,34,51 Eu(Fe 1−x Ru x ) 2 As 2 , 12 and Eu(Fe 1−x Ir x ) 2 As 2 . 13,35,52 Interestingly, in the phase diagram shown in Fig.…”

Section: Discussionsupporting

confidence: 69%

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
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The magnetic ground state of the Eu 2+ moments in a series of Eu(Fe1−xCox)2As2 single crystals grown from the Sn flux has been investigated in detail by neutron diffraction measurements. Combined with the results from the macroscopic properties (resistivity, magnetic susceptibility and specific heat) measurements, a phase diagram describing how the Eu magnetic order evolves with Co doping in Eu(Fe1−xCox)2As2 is established. The ground-state magnetic structure of the Eu 2+ spins is found to develop from the A-type antiferromagnetic (AFM) order in the parent compound, via the A-type canted AFM structure with some net ferromagnetic (FM) moment component along the crystallographic c direction at intermediate Co doping levels, finally to the pure FM order at relatively high Co doping levels. The ordering temperature of Eu declines linearly at first, reaches the minimum value of 16.5(2) K around x = 0.100(4), and then reverses upwards with further Co doping. The doping-induced modification of the indirect Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between the Eu 2+ moments, which is mediated by the conduction d electrons on the (Fe,Co)As layers, as well as the change of the strength of the direct interaction between the Eu 2+ and Fe 2+ moments, might be responsible for the change of the magnetic ground state and the ordering temperature of the Eu sublattice. In addition, for Eu(Fe1−xCox)2As2 single crystals with 0.10 x 0.18, strong ferromagnetism from the Eu sublattice is well developed in the superconducting state, where a spontaneous vortex state is expected to account for the compromise between the two competing phenomena.

show abstract

Section: Discussionsupporting

confidence: 69%

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
Self Cite
30
2
46
0
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“…In the case of samples P015 and P0165, two clear humps can be resolved in the zero‐field‐cooled (ZFC) and field‐cooled (FC) curves. It has been shown, that the feature at

T_{N}

can be assigned to the magnetic ordering of the Eu

^{2 +}

moments with strong ferromagnetic component out of plane . The dip at

T_{SG}

preceding the second hump is identified as a transition to an in‐plane glass‐like behavior of the Eu spins ().…”

Section: Resistivity and Magnetic Susceptibilitymentioning

confidence: 99%

Optical properties of superconducting EuFe₂ (As_1‐xP_x)₂

Neubauer

Pronin

Zapf

et al. 2016

Physica Status Solidi (b)

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We present a broadband optical-conductivity study of superconducting single-crystalline EuFe2(As1-xPx)2 with three different substitutional levels. We analyze the normal-state electrodynamics by decomposing the conductivity spectra using a Drude-Lorentz model with two Drude terms representing two groups of carriers with different scattering rates. The analysis reveals that the scattering rate of at least one of the Drude components develops linearly with temperature for each doping level. This points towards strong electron-electron correlations and a non-Fermi-liquid behavior in the P-substituted superconducting Eu-122 pnictides. We also detect a transfer of the spectral weight from mid-infrared to higher frequencies and assign it to the Hund's-rule coupling between itinerant and localized carriers. The conductivity spectra below the superconducting transition show no sharp features to be associated with the dirty-limit superconducting BCS gaps. We interpret these results in terms of clean-limit superconductivity in EuFe2(As1-xPx)2. The best parametrization fit can be achieved using a two-gap model. We find that the larger gap at the hole pockets of the Fermi surface is likely to be isotropic, while the smaller gap at the electron pockets is anisotropic or even nodal.Comment: to be published in Physica Status Solidi B - Special Issue on Iron Pnictide

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“…From magnetization measurements for magnetic fields within the ab‐plane, it has been deduced, that the 4f ordering changes its character from AF to FM at P concentrations beyond

x = 0.23

(). Recent neutron scattering has shown that the Eu 4f moments order ferromagnetically along the c ‐axis already for

x = 0.19

(). The proposed canted AF order, deduced from bulk magnetization measurements () could not be confirmed ().…”

Section: Chemical and Hydrostatic Pressurementioning

confidence: 99%

“…Recent neutron scattering has shown that the Eu 4f moments order ferromagnetically along the c ‐axis already for

x = 0.19

(). The proposed canted AF order, deduced from bulk magnetization measurements () could not be confirmed (). As shown in the phase diagram displayed in Fig.…”

Section: Chemical and Hydrostatic Pressurementioning

confidence: 99%

Interplay of 4f and 3d moments in EuFe₂As₂ iron pnictides

Maiwald

Gegenwart

2016

Physica Status Solidi (b)

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EuFe2As2 is unique among 122 iron pnictides due to its 4f magnetic moments. We review its properties with particular emphasis on the interplay between 4f and 3d moments. After discussing the parent compound, we first focus on the evolution of magnetism and superconductivity for hole‐doped Eu1−xKxFe2As2 as well as for chemical and hydrostatic pressure in EuFe2(As1−xPx)2 . Non‐Fermi liquid behavior for optimally doped superconducting systems is highlighted in the electrical resistivity and thermoelectric power. We also discuss the in‐plane anisotropy and how the indirect magnetoelastic coupling between Eu 4f moments and the crystal structure can be used for persistent detwinning of EuFe2As2 in the orthorhombic state by small magnetic fields.

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Magnetic structure of theEu2+moments in superconductingEuFe2(As1−x

Cited by 40 publications

References 36 publications

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
Self Cite
30
2
46
0
View full text Add to dashboard Cite

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
Self Cite
30
2
46
0
View full text Add to dashboard Cite

Optical properties of superconducting EuFe₂ (As_1‐xP_x)₂

Interplay of 4f and 3d moments in EuFe₂As₂ iron pnictides

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Magnetic structure of theEu2+moments in superconductingEuFe2(As1−x

Cited by 40 publications

References 36 publications

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2AsJin1, Xiao2, Bukowski3 et al. 2016Phys. Rev. BSelf Cite302460View full textAdd to dashboardCite

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2AsJin1, Xiao2, Bukowski3 et al. 2016Phys. Rev. BSelf Cite302460View full textAdd to dashboardCite

Optical properties of superconducting EuFe2 (As1‐xPx)2

Interplay of 4f and 3d moments in EuFe2As2 iron pnictides

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Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
Self Cite
30
2
46
0
View full text Add to dashboard Cite

Phase diagram of Eu magnetic ordering in Sn-flux-grown Eu(Fe1−xCox)2As
Jin
¹
,
Xiao
²
,
Bukowski
³

et al. 2016
Phys. Rev. B
Self Cite
30
2
46
0
View full text Add to dashboard Cite

Optical properties of superconducting EuFe₂ (As_1‐xP_x)₂

Interplay of 4f and 3d moments in EuFe₂As₂ iron pnictides