Absence of the stripe antiferromagnetic order in the new 30 K superconductor ThFeAsN

Albedah, Mohammed A.; Nejadsattari, Farshad; Stadnik, Z. M.; Wang, Zhicheng; Wang, Cao; Cao, Guang‐Han

doi:10.1016/j.jallcom.2016.10.239

Cited by 22 publications

(26 citation statements)

References 17 publications

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“…All crystallographic parameters listed in Table.1 are mostly consistent with previous X-ray diffraction results [24]. Since there is no p-2 Neutron powder diffraction of ThFeAsN [27]. We also performed Rietveld refinements with the Full-Prof program considering other possibilities.…”

supporting

confidence: 71%

“…To quantitatively compare the neutron diffraction peaks, we have normalized the maximum neutron counts at 300 K to be the same as 6 K and the difference between 6 K and 40 K is obtained by direct subtraction from the raw data after normalized by monitor counts (Fig.1(c)). Most of reflections can be indexed by a tetragonal phase in ZrCuSiAs-type structure with the space group P 4/nmm (a=b=4.0414Å, c=8.5152Å), except for very small amount Fe 5 As 12 and FeAs impurity phases (< 5 %), which are not detected in X-ray diffraction experiment [24,27]. Fig.1(d) shows the Rietveld refinement of the neutron diffraction patterns at 6 K by assuming 100% occupancy of ThFeAsN.…”

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confidence: 99%

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Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN

Mao¹,

Wang²,

Maynard-Casely³

et al. 2017

EPL

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We report neutron diffraction and transport results on the newly discovered superconducting nitride ThFeAsN with Tc = 30 K. No magnetic transition, but a weak structural distortion around 160 K, is observed cooling from 300 K to 6 K. Analysis on the resistivity, Hall transport and crystal structure suggests this material behaves as an electron optimally doped pnictide superconductors due to extra electrons from nitrogen deficiency or oxygen occupancy at the nitrogen site, which together with the low arsenic height may enhance the electron itinerancy and reduce the electron correlations, thus suppress the static magnetic order. †

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confidence: 71%

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confidence: 99%

Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN

Mao¹,

Wang²,

Maynard-Casely³

et al. 2017

EPL

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“…for the iron DOS. These results are in reasonable agreement to related works on this material [7,[10][11][12].…”

Section: Electronic Structure Calculationssupporting

confidence: 93%

“…Most compounds in this class of materials show magnetic order in the ground state and allow for a Cooper pair condensate only upon sufficient doping or pressure [4,5]. ThFeAsN takes an unusual role in this respect, since the ground state has been reported to already be non-magnetic and superconducting, without the need of external parameter tuning [1,6,7]. Additionally, it has been shown that applying pressure to this system decreases T c [8], which is in contrast to other Fe-based superconductors, such as bulk FeSe [9].…”

Section: Introductionmentioning

confidence: 99%

Exploring multichannel superconductivity in ThFeAsN

Schrodi,

Kabeer,

Aperis

et al. 2021

Preprint

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We investigate theoretically the superconducting state of the undoped Fe-based superconductor ThFeAsN. Using input from ab initio calculations, we solve the Fermi-surface based, multichannel Eliashberg equations for Cooper-pair formation mediated by spin and charge fluctuations, and by the electron-phonon interaction (EPI). Our results reveal that spin fluctuations alone, when coupling only hole-like with electron-like energy bands, can account for a critical temperature Tc up to ∼ 7.5 K with an s±-wave superconducting gap symmetry, which is a comparatively low Tc with respect to the experimental value T exp c = 30 K. Other combinations of interaction kernels (spin, charge, electronphonon) lead to a suppression of Tc due to phase frustration of the superconducting gap. We qualitatively argue that the missing ingredient to explain the gap magnitude and Tc in this material is the first-order correction to the EPI vertex. In the noninteracting state this correction adopts a form supporting the s± gap symmetry, in contrast to EPI within Migdal's approximation, i.e., EPI without vertex correction, and therefore it enhances tendencies arising from spin fluctuations.

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“…[2] However, in the Mössbauer data the deformation becomes visible only below 80 K. Above 80 K the quadrupole splitting may remain below the detection limit, as the quadrupole coupling constant usually increases with decreasing temperature, as, e.g., in the ThFeAsN phase. [4] Fe This is in accord with the singlet-like feature observed. Initially, the first Mössbauer spectra were fitted using the singlet and the paramagnetic doublet only.…”

Section: Mössbauer Spectrasupporting

confidence: 90%

Mössbauer Study of BaTh₂Fe₄As₄(N_0.7O_0.3)₂

Pohjonen

Lindén

et al. 2021

Physica Status Solidi (b)

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A superconductive BaTh2Fe4As4(N0.7O0.3)2 oxypnictide sample is synthesized using a high‐temperature solid‐state reaction route. X‐ray diffraction followed by Rietveld analysis is used for checking the phase content. 57Fe Mössbauer spectroscopy in transmission geometry is used for characterizing the hyperfine parameters of the iron site. Owing to the slightly deformed tetrahedral As coordination around Fe, the quadrupole coupling constant of Fe is nonzero, but small. This is visible in particular below 80 K. Judging by the consistency two Debye temperatures of 352 and 369 K values obtained using the total absorption and the second‐order Doppler shift, a harmonic approximation for the phonon spectra can be assumed.

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Absence of the stripe antiferromagnetic order in the new 30 K superconductor ThFeAsN

Cited by 22 publications

References 17 publications

Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN

Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN

Exploring multichannel superconductivity in ThFeAsN

Mössbauer Study of BaTh₂Fe₄As₄(N_0.7O_0.3)₂

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Absence of the stripe antiferromagnetic order in the new 30 K superconductor ThFeAsN

Cited by 22 publications

References 17 publications

Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN

Neutron powder diffraction study on the iron-based nitride superconductor ThFeAsN

Exploring multichannel superconductivity in ThFeAsN

Mössbauer Study of BaTh2Fe4As4(N0.7O0.3)2

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Product

Resources

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Mössbauer Study of BaTh₂Fe₄As₄(N_0.7O_0.3)₂