Physical and magnetic properties of Ba(Fe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:math>Mn<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mi>x</mml:mi></mml:msub></mml:math>)<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>As

Thaler, A.; Hodovanets, Halyna; Torikachvili, M. S.; Ran, Sheng; Kracher, A.; Straszheim, Warren E.; Yan, Jiaqiang; Mun, Eundeok; Canfield, Paul C.

doi:10.1103/physrevb.84.144528

Cited by 75 publications

(90 citation statements)

References 38 publications

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“…Consistently, neutron diffraction experiments [22] in Cr (d 4 ) doped samples Ba(Fe 1−x Cr x )As 2 show a transition between the (π, 0) and the (π, π) order for x ∼ 0.3. Note that partially substituting Fe by Cr or Mn does not produce a transi- tion to a superconducting phase [287]. It is believed that Cr and Mn do not incorporate itinerant electrons in the samples but act as magnetic impurities.…”

Section: B Magnetic Softness In Doped Compoundsmentioning

confidence: 99%

Magnetic interactions in iron superconductors: A review

Bascones

Valenzuela

Calderón

2015

Comptes Rendus. Physique

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High temperature superconductivity in iron pnictides and chalcogenides emerges when a magnetic phase is suppressed. The multi-orbital character and the strength of correlations underlie this complex phenomenology, involving magnetic softness and anisotropies, with Hund's coupling playing an important role. We review here the different theoretical approaches used to describe the magnetic interactions in these systems. We show that taking into account the orbital degree of freedom allows us to unify in a single phase diagram the main mechanisms proposed to explain the (π, 0) order in iron pnictides: the nesting-driven, the exchange between localized spins, and the Hund induced magnetic state with orbital differentiation. Comparison of theoretical estimates and experimental results helps locate the Fe superconductors in the phase diagram. In addition, orbital physics is crucial to address the magnetic softness, the doping dependent properties, and the anisotropies.

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Section: B Magnetic Softness In Doped Compoundsmentioning

confidence: 99%

Magnetic interactions in iron superconductors: A review

Bascones

Valenzuela

Calderón

2015

Comptes Rendus. Physique

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“…While it is well known that hole-doping via K substitution for Ba in BaFe 2 As 2 induces high-T c superconductivity (Rotter et al, 2008a), substitution of Mn and Cr for Fe in BaFe 2 As 2 never induces superconductivity Thaler et al, 2011). In the case of Cr-doping, the system adopts a checkerboard G-type AF structure for Ba(Fe 1x Cr x ) 2 As 2 with x > 0.3 [ Fig.…”

Section: Evolution Of Spin Excitations In Iron Chalcogenides and Amentioning

confidence: 99%

Antiferromagnetic order and spin dynamics in iron-based superconductors

2015

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High-transition temperature (high-Tc) superconductivity in the iron pnictides/chalcogenides emerges from the suppression of the static antiferromagnetic order in their parent compounds, similar to copper oxides superconductors. This raises a fundamental question concerning the role of magnetism in the superconductivity of these materials. Neutron scattering, a powerful probe to study the magnetic order and spin dynamics, plays an essential role in determining the relationship between magnetism and superconductivity in high-Tc superconductors. The rapid development of modern neutron time-of-flight spectrometers allows a direct determination of the spin dynamical properties of iron-based superconductors throughout the entire Brillouin zone. In this review, we present an overview of the neutron scattering results on iron-based superconductors, focusing on the evolution of spin excitation spectra as a function of electron/hole-doping and isoelectronic substitution. We compare spin dynamical properties of iron-based superconductors with those of copper oxide and heavy fermion superconductors, and discuss the common features of spin excitations in these three families of unconventional superconductors and their relationship with superconductivity.

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“…Despite the metallic ground state of the parent compounds, strong electronic correlations are suggested to be present in iron pnictides [6][7][8] , especially in heavily hole-doped systems [9][10][11] . In addition to replacing A in AFe 2 As 2 (A = Ca, Sr, Ba) with alkaline metals (K, Na, Rb, Cs) 4,5 , hole-doping in iron pnictides can be achieved through Mn or Cr doping on Fe site although no superconductivity is induced in these cases 12,13 . Doping Cu on Fe site presents an intriguing case, whereas at low doping levels Cu is suggested to dope electrons 14 , at higher concentrations Cu has a 3d 10 configuration and acts as a hole-dopant 15,16 .…”

Section: Introductionmentioning

confidence: 99%

Phase diagram and neutron spin resonance of superconducting NaFe1−xCuxAs

et al. 2017

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We use transport and neutron scattering to study the electronic phase diagram and spin excitations of NaFe1−xCuxAs single crystals. Similar to Co-and Ni-doped NaFeAs, a bulk superconducting phase appears near x ≈ 2% with the suppression of stripe-type magnetic order in NaFeAs. Upon further increasing Cu concentration the system becomes insulating, culminating in an antiferromagnetically ordered insulating phase near x ≈ 50%. Using transport measurements, we demonstrate that the resistivity in NaFe1−xCuxAs exhibits non-Fermi-liquid behavior near x ≈ 1.8%. Our inelastic neutron scattering experiments reveal a single neutron spin resonance mode exhibiting weak dispersion along c-axis in NaFe0.98Cu0.02As. The resonance is high in energy relative to the superconducting transition temperature Tc but weak in intensity, likely resulting from impurity effects. These results are similar to other iron pnictides superconductors despite the superconducting phase in NaFe1−xCuxAs is continuously connected to an antiferromagnetically ordered insulating phase near x ≈ 50% with significant electronic correlations. Therefore, electron correlations is an important ingredient of superconductivity in NaFe1−xCuxAs and other iron pnictides.

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Physical and magnetic properties of Ba(Fe1−xMnx)2As

Cited by 75 publications

References 38 publications

Magnetic interactions in iron superconductors: A review

Magnetic interactions in iron superconductors: A review

Antiferromagnetic order and spin dynamics in iron-based superconductors

Phase diagram and neutron spin resonance of superconducting NaFe1−xCuxAs

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