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Lester, C.; Chu, Jiun-Haw; Analytis, James; Capelli, S.; Erickson, A. S.; Condron, Cathie L.; Toney, Michael F.; Fisher, I. R.; Hayden, Stephen M

doi:10.1103/physrevb.80.229901

Cited by 85 publications

(142 citation statements)

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“…The presence of a "dome" and possible overlap between magnetic and SC regions is consistent with results published for other 1111-and 122-type cobalt-doped superconductors although the existence of phase coexistence is still under debate. 9,17,18,45 The critical field, H c2 ͑T͒, increases by approximately 2.3͑1͒ T K −1 for the three measured compositions upon cooling below T c . This is smaller than for "indirect" ͑not Fe-site͒ electron-doped superconductors, such as NdFeAsO 1−x F x , where values of 4 -5 T K −1 have been observed.…”

Section: Discussionmentioning

confidence: 99%

Superconductivity inNdFe1−xCoxAsO(

et al. 2010

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The phase diagram of NdFe 1−x Co x AsO for low cobalt substitution consists of a superconducting dome ͑0.05Ͻ x Ͻ 0.20͒ with a maximum critical temperature of 16.5͑2͒ K for x = 0.12. The x = 1 end member, NdCoAsO, is an itinerant ferromagnet ͑T C =85 K͒ with an ordered moment of 0.30͑1͒ B at 15 K. Below T N = 9 K, Nd spin ordering results in the antiferromagnetic coupling of the existing ferromagnetic planes. Rietveld analysis reveals that the electronically important twofold tetrahedral angle increases from 111.4°to 115.7°in this series. Underdoped samples with x = 0.046͑2͒ and x = 0.065͑2͒ show distortions to the orthorhombic Cmma structure at 72͑2͒ and 64͑2͒ K, respectively. The temperature dependences of the critical fields H c2 ͑T͒ near T c are linear with almost identical slopes of 2.3͑1͒ T K −1 for x = 0.065͑2͒, x = 0.118͑2͒, and x = 0.172͑2͒. The estimated critical field H c2 ͑0͒ and correlation length for optimally doped samples are 26͑1͒ T and 36͑1͒ Å. A comparison of the maximum reported critical temperatures of well-characterized cobalt-doped 122-and 1111-type superconductors is presented.

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Section: Discussionmentioning

confidence: 99%

Superconductivity inNdFe1−xCoxAsO(

et al. 2010

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“…For electron-doped BaFe 2−x T x As 2 (T =Co, Ni) 3 , the antiferromagnetic (AF) and superconducting phase diagrams as a function of Co(Ni)-doping have been determined by neutron scattering experiments ( Fig. 1(a)) 10,11 . Near the optimally electron-doped superconductor BaFe 2−x Ni x As 2 at x = 0.1 (T c = 20 K), the static AF order is suppressed 12 .…”

Section: Introductionmentioning

confidence: 99%

Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As

et al. 2012

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We use polarized inelastic neutron scattering to study low-energy spin excitations and their spatial anisotropy in electron-overdoped superconducting BaFe1.85Ni0.15As2 (Tc = 14 K). In the normal state, the imaginary part of the dynamic susceptibility, χ ′′ (Q, ω), at the antiferromagnetic (AF) wave vector Q = (0.5, 0.5, 1) increases linearly with energy for E ≤ 13 meV. Upon entering the superconducting state, a spin gap opens below E ≈ 3 meV and a broad neutron spin resonance appears at E ≈ 7 meV. Our careful neutron polarization analysis reveals that χ ′′ (Q, ω) is isotropic for the in-plane and out-of-plane components in both the normal and superconducting states. A comparison of these results with those of undoped BaFe2As2 and optimally electron-doped BaFe1.9Ni0.1As2 (Tc = 20 K) suggests that the spin anisotropy observed in BaFe1.9Ni0.1As2 is likely due to its proximity to the undoped BaFe2As2. Therefore, the neutron spin resonance is isotropic in the overdoped regime, consistent with a singlet to triplet excitation.

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“…Respectively, the crystal with x = 0.07 is denoted as underdoped (UD), and the crystal with x = 0.11 as overdoped (OD). In literature the optimal cobalt concentration x for superconductivity in this series is reported to lie in the range from 6% to 10% depending on the method and regimes of preparation 1,[6][7][8][9] . Note that for Co concentration less than optimal two areas in the phase diagram T vs x can be distinguished: the one corresponding to the spin density wave (SDW) state (at high temperature) and the other corresponding to the su- perconducting state (at low temperatures) 1 .…”

Section: Methodsmentioning

confidence: 86%

“…Thus, taking into account that in the UD crystal the value of n is close to that of the δT c -pinning regime, a large j c0 value and its weak field dependence can be related to the occurrence of large-size pinning centers in this sample. Considering the phase diagram of the Ba(Fe 1−x Co x ) 2 As 2 compound 1,9 where the coexistence of the superconducting and magnetically ordered phases at x ≤ 0.8 has been observed 6,21 , one can associate such large-size pinning centers with regions of magnetically ordered phase which should apparently be present in the UD single crystal below T SDW = 40 K. In favor of this assumption, the study of a similar iron pnictide Ba 1−x K x Fe 2 As 2 by neutron scattering, muon-spin rotation and magnetic force microscopy revealed magnetic (nonsuperconducting) inclusions of the 65 nm size 22 . We conjecture that magnetically ordered domains in our UD crystal have the size of the same order of magnitude.…”

Section: Resultsmentioning

confidence: 99%

“…Note that for Co concentration less than optimal two areas in the phase diagram T vs x can be distinguished: the one corresponding to the spin density wave (SDW) state (at high temperature) and the other corresponding to the su- perconducting state (at low temperatures) 1 . According to a neutron scattering study 6 , at these concentrations at T < T c the superconducting phase coexists with the magnetically ordered phase. The parameters of the superconducting transition were determined from the temperature dependence of AC susceptibility (Fig.…”

Section: Methodsmentioning

confidence: 99%

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Microwave absorption study of pinning regimes in Ba(Fe_1−xCo_x)₂As₂ single crystals

Talanov

Beisengulov

Kornilov

et al. 2013

Supercond. Sci. Technol.

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Magnetic field dependent modulated microwave absorption (MMWA) measurements have been carried out to investigate vortex pinning effects in single crystals of the iron-based high-Tc superconductor Ba(Fe1−xCox)2As2 with three different cobalt doping levels of x = 0.07, 0.09, and 0.11. The dependence of the MMWA hysteresis loops on temperature, magnetic field, and Co-concentration have been measured and analyzed using a theoretical model of microwave absorption in superconductors. The analysis reveals that in an underdoped crystal (x = 0.07) the so called δTc-pinning due to magnetically ordered regions defines the temperature dependence of the critical current density, while in the optimally doped (x = 0.09) and overdoped (x = 0.11) samples the pinning is governed by structural imperfections due to inhomogeneous distribution of cobalt dopant and has the so called δl character.

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Erratum: Neutron scattering study of the interplay between structure and magnetism inBa(Fe1−xCox)2

Cited by 85 publications

References 0 publications

Superconductivity inNdFe1−xCoxAsO(

Superconductivity inNdFe1−xCoxAsO(

Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As

Microwave absorption study of pinning regimes in Ba(Fe_1−xCo_x)₂As₂ single crystals

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Erratum: Neutron scattering study of the interplay between structure and magnetism inBa(Fe1−xCox)2

Cited by 85 publications

References 0 publications

Superconductivity inNdFe1−xCoxAsO(

Superconductivity inNdFe1−xCoxAsO(

Polarized neutron scattering studies of magnetic excitations in electron-overdoped superconducting BaFe1.85Ni0.15As

Microwave absorption study of pinning regimes in Ba(Fe1−xCox)2As2 single crystals

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Microwave absorption study of pinning regimes in Ba(Fe_1−xCo_x)₂As₂ single crystals