Reentrant superconductivity in Eu(Fe1−xIrx)2As2

Paramanik, U. B.; Das, Debarchan; Prasad, R.; Hossain, Zakir

doi:10.1088/0953-8984/25/26/265701

Cited by 36 publications

(52 citation statements)

References 41 publications

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“…The Density of States and Band structure of the compound show very close similarity as seen above. The zero binding energy and Fermi level correspond, in agreement with previous studies on the material [44].…”

Section: Resultssupporting

confidence: 91%

Structural and electronic properties of the iron pnictide compound EuFe₂As₂ from first principles

Omboga

Otieno

2020

J. Phys. Commun.

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We report results of the electronic and mechanical structure properties of the iron pnictide compound EuFe 2 As 2 , at zero pressure. The open source computer code Quantum Espresso, which incorporates the Density Functional Theory (DFT), Pseudo Potentials (PP) and the Plane Wave (PW) were used to perform calculations from first principles. Projector-Augmented Wave (PAW) Pseudo Potentials were used in these calculations. The Density of States exhibits a sizeable superconducting gap and the band structure has no bandgap. Calculations were performed from scratch.

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Section: Resultssupporting

confidence: 91%

Structural and electronic properties of the iron pnictide compound EuFe₂As₂ from first principles

Omboga

Otieno

2020

J. Phys. Commun.

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“…So, we confirm that the Fe 3d-electrons dominate the density of states near the Fermi level; this indicates that these electrons could be the origin of superconductivity in these materials. Several ab initio calculations [24][25][26][27][28][29] have shown that the electronic structure of many similar materials have a significant contribution of Fe 3d-electrons near the Fermi level, which are in excellent agreement with our results.…”

Section: Electronic Propertiessupporting

confidence: 91%

Ab-initio investigation of the electronic structure in the superconducting EuFe2(As1−xPx)2

Drief

Zaoui

Kacimi

et al. 2015

Physica C: Superconductivity and its Applications

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“…A sharp superconducting transition appears below T onset sc = 22.2 K, and zero resistance is achieved at 21 K. No re-entrant resistance was observed below T sc . For the crystals with x = 0.10 and 0.13, re-entrant resistance was detected, such as the case of the Eu(Fe 1−x Ir x ) 2 As 2 polycrystalline samples [33]. This result further indicates that the x = 0.12 crystal is optimally doped with regard to SC.…”

Section: Sample's Characterizationsmentioning

confidence: 76%

“…This kink can be understood as a consequence of Euspin tilting or canting [14,15,19] as observed in many EuFe 2 As 2 -related system. However, the canted AFM [18,19,33], which is expected to show pure AFM behavior for H ab, is unlikely because χ ab increases below T tilt m (note that χ ab of EuFe 2 As 2 crystals decreases steeply below the magnetic ordering temperature [34]). Besides, the FM-like hysteresis in magnetization with the field along the basal plane (see figure S1 in the supplementary data (available from stacks.iop.org/NJP/15/113002/mmedia)) also suggests FM component in the basal plane, which is incompatible with the canted AFM.…”

Section: Low-field Magnetic Susceptibilitymentioning

confidence: 99%

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Anomalous critical fields and the absence of Meissner state in Eu(Fe_0.88Ir_0.12)₂As₂crystals

et al. 2013

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We report electrical and magnetic measurements of an optimally doped Eu(Fe 0.88 Ir 0.12 ) 2 As 2 crystal which shows superconductivity at T sc = 22 K and magnetic ordering of the Eu 2+ spins below 20 K. The results suggest that the Eu 2+ spins lie flat ferromagnetically in the ab plane at T ab m = 20 K, and then tilt toward the c-axis at T tilt m = 17.4 K. The isothermal magnetization loop at low temperatures shows both ferromagnetic behavior and superconducting characteristics, unambiguously demonstrating the coexistence of ferromagnetism and superconductivity. The upper critical field measured is remarkably reduced, as compared to other Fe-based superconductors with the same T sc , and it exhibits abnormal temperature dependence featured by the existence of an inflection point around T ab m , where the anisotropy ratio γ (≡ H ab c2 /H c c2 ) shows a minimum value smaller than 1.0. These observations can be explained by a ferromagnetic exchange field of ∼30 T which tilts its direction toward the c-axis below T tilt m . The strong internal field, much higher than the intrinsic lower critical field expected, leads to the absence of Meissner state, which is confirmed by the magnetic measurements under ultra-low fields. IntroductionSuperconductivity (SC) and ferromagnetism (FM) are two antagonistic cooperative phenomena in solid-state systems, thus it is very rare that SC coexists with FM (or even other magnetic states with ferromagnetic component) in a single material 2 [1,2]. Such material showing both SC and ferromagnetic components was earlier called 'ferromagnetic superconductor' (FMSC) [1] or 'magnetic superconductor' [3]. Lorenz and Chu [4] classified this special material into two categories according to its superconducting transition temperature T sc and ferromagnetic transition temperature T m . When T m > T sc , it is termed 'superconducting ferromagnet'; and for T m < T sc , it is called an FMSC.Recently, possible FMSCs were found in the EuFe 2 As 2 -related system, where the Eu spins and the FeAs layers are respectively responsible for spontaneous magnetization and SC, by applying pressure [5,6] or by chemical doping with phosphorus [7], cobalt [8,9] and ruthenium [10]. The parent compound EuFe 2 As 2 undergoes two antiferromagnetic transitions at ∼20 and ∼195 K, respectively, corresponding to the Eu and the Fe sublattices [11,12]. The magnetic structure was revealed by a neutron diffraction study [13] which shows an A-type antiferromagnetism (AFM) for the Eu 2+ spins, and a stripe-like AFM (also called spindensity wave (SDW)) for the Fe magnetic moment. Both Eu and Fe moments are parallel to the crystallographic a-axis in the undoped EuFe 2 As 2 . SC at 5-30 K emerges when the Fe-site SDW is sufficiently suppressed, either by applying high pressures or by an extrinsic doping. Simultaneously, the Eu 2+ spins turn to the c-axis at low temperatures [14,15], which leads to FM [7, 16, 17], helimagnetism [8] or spin canting [18,19], all with significant ferromagnetic component. The coexistence of SC and FM ...

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Reentrant superconductivity in Eu(Fe_1−xIr_x)₂As₂

Cited by 36 publications

References 41 publications

Structural and electronic properties of the iron pnictide compound EuFe₂As₂ from first principles

Structural and electronic properties of the iron pnictide compound EuFe₂As₂ from first principles

Ab-initio investigation of the electronic structure in the superconducting EuFe2(As1−xPx)2

Anomalous critical fields and the absence of Meissner state in Eu(Fe_0.88Ir_0.12)₂As₂crystals

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Reentrant superconductivity in Eu(Fe1−xIrx)2As2

Cited by 36 publications

References 41 publications

Structural and electronic properties of the iron pnictide compound EuFe2As2 from first principles

Structural and electronic properties of the iron pnictide compound EuFe2As2 from first principles

Ab-initio investigation of the electronic structure in the superconducting EuFe2(As1−xPx)2

Anomalous critical fields and the absence of Meissner state in Eu(Fe0.88Ir0.12)2As2crystals

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Reentrant superconductivity in Eu(Fe_1−xIr_x)₂As₂

Structural and electronic properties of the iron pnictide compound EuFe₂As₂ from first principles

Structural and electronic properties of the iron pnictide compound EuFe₂As₂ from first principles

Anomalous critical fields and the absence of Meissner state in Eu(Fe_0.88Ir_0.12)₂As₂crystals