Synthesis, crystal structure and spin-density-wave anomaly of the iron arsenide-fluoride SrFeAsF

Tegel, Marcus; Johansson, Svante; Weiß, Veronika; Schellenberg, Inga; Hermes, Wilfried; Pöttgen, Rainer; Johrendt, Dirk

doi:10.1209/0295-5075/84/67007

Cited by 95 publications

(98 citation statements)

References 25 publications

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“…The AF2 phase is lower by 80 meV in total energy per formula unit than the AF1 phase. This means that the striped AF2 phase is the ground-state phase, in agreement with experiment [28,29]. The Fe spins align parallel along the a (shorter) axis and antiparallel along the b axis, which is the same as LaFeAsO [6,17,40].…”

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confidence: 86%

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Striped antiferromagnetism and electronic structures of SrFeAsF and their implications

Zhu¹,

Liu²

2009

Europhys. Lett.

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Abstract. -We investigate structural, magnetic, and electronic properties of SrFeAsF as a new parent for superconductors using a state-of-the-art density-functional theory method. Calculated results show that the striped antiferromagnetic order is the magnetic ground state in the Fe layer and the interlayer magnetic interaction is tiny. Calculated As and Sr positions are in good agreement with experiment. There are only two quasi-two-dimensional bands near the Fermi level. The valence charge is mainly in the Fe and F layers, and the magnetic moment is confined to the Fe atoms. All the spin couplings within the Fe layer are antiferromagnetic due to the superexchange through the nearest As atoms. These results, with the record-equaling phasetransition temperature in the latest Sm-doped SrFeAsF, show that the SrFeAsF, sharing the same structure with LaFeAsO, is promising for achieving better superconductors.

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confidence: 86%

“…These results are useful for understanding the structural, electronic, and magnetic properties of SrFeAsF and should have implications achieving better superconductors by appropriate doping. * * * BGL is grateful to H. H. Wen for informing him of the SrFeAsF series [24,25,28,29]. This work is sup- …”

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confidence: 98%

Striped antiferromagnetism and electronic structures of SrFeAsF and their implications

Zhu¹,

Liu²

2009

Europhys. Lett.

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“…Superconductivity at about 2.2 K has also been found in a NiP-based layered structure La 3 Ni 4 O 2 P 4 with the inter growth of NiP-1111 and 122 building blocks. 12 Very recently, another kind of parent compounds (Sr,Ca,Eu)FeAsF were reported, 13,14,15,16 which may lead to high temperature superconductors by doping charges into the system.…”

Section: Introductionmentioning

confidence: 99%

Sr3Sc2Fe2As2O5as

et al. 2009

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A new compound with the FeAs-layers, namely (Sr3Sc2O5)Fe2As2 (abbreviated as FeAs-32522), was successfully fabricated. It has a layered structure with the space group of I4/mmm, and with the lattice constants a = 4.069Å and c = 26.876Å. The in-plane Fe ions construct a square lattice which is close to that of other FeAs-based superconductors, such as REFeAsO (RE = rare earth elements) and (Ba,Sr)Fe2As2. However the inter FeAs-layer spacing in the new compound is greatly enlarged. The temperature dependence of resistivity exhibits a weak upturn in the low temperature region, but a metallic behavior was observed above about 60 K. The magnetic susceptibility shows also a non-monotonic behavior. Interestingly, the well-known resistivity anomaly which was discovered in all other parent compounds, such as REFeAsO, (Ba,Sr)Fe2As2 and (Sr,Ca,Eu)FeAsF and associated with the Spin-Density-Wave (SDW)/structural transition has not been found in the new system either on the resistivity data or the magnetization data. This could be induced by the large spacing distance between the FeAs-planes, therefore the antiferromagnetic correlation between the moments of Fe ions in neighboring FeAs-layers cannot be established. Alternatively it can also be attributed to the self-doping effect between Fe and Sc ions. The Hall coefficient RH is negative but strongly temperature dependent in wide temperature region, which indicates the dominance of electrical conduction by electron-like charge carriers and probably a multi-band effect or a spin related scattering effect. It is found that the magnetoresistance cannot be described by the Kohler's rule, which gives further support to above arguments.

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“…Many new structures with the FeAs layers have been found, including the so-called 1111 phase (LNFeAsO, AEFeAsF, LN = rare earth elements, AE = alkaline earth elements) [1][2][3] , 122 phase (AEF e 2 As 2 , AE = alkaline earth elements) 4,5 , 111 phase (LiFeAs, NaFeAs) 6,7 , 11 phase (FeSe) 8 , 32522 phase (Sr 3 Sc 2 O 5 Fe 2 As 2 ) 9 , and 21311 phase (Sr 2 ScO 3 FeP and Sr 2 VO 3 FeAs ) 10,11 . In the system of (Ba,Sr) 1−x K x Fe 2 As 2 with the ThCr 2 Si 2 structure (denoted as 122 phase), the maximum T c at about 38 K was discovered 4,5 at about x = 0.40.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity induced by doping platinum inBaFe2As2

Zhu

Han

et al. 2010

Phys. Rev. B

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By substituting Fe with the 5d-transition metal Pt in BaFe2As2, we have successfully synthesized the superconductors BaFe2−xPtxAs2. The systematic evolution of the lattice constants indicates that the Fe ions were successfully replaced by Pt ions. By increasing the doping content of Pt, the antiferromagnetic order and structural transition of the parent phase is suppressed and superconductivity emerges at a doping level of about x = 0.02. At a doping level of x = 0.1, we get a maximum transition temperature Tc of about 25 K. While even for this optimally doped sample, the residual resistivity ratio (RRR) is only about 1.35, indicating a strong impurity scattering effect. We thus argue that the doping to the Fe-sites naturally leads to a high level impurity scattering, although the superconductivity can still survive at about 25 K. The synchrotron powder x-ray diffraction shows that the resistivity anomaly is in good agreement with the structural transition. The superconducting transitions at different magnetic fields were also measured at the doping level of about x = 0.1, yielding a slope of -dHc2/dT = 5.4 T/K near Tc. Finally a phase diagram was established for the Pt doped 122 system. Our results suggest that superconductivity can also be easily induced in the FeAs family by substituting the Fe with Pt, with almost the similar maximum transition temperatures as doping Ni, Co, Rh and Ir.

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Synthesis, crystal structure and spin-density-wave anomaly of the iron arsenide-fluoride SrFeAsF

Cited by 95 publications

References 25 publications

Striped antiferromagnetism and electronic structures of SrFeAsF and their implications

Striped antiferromagnetism and electronic structures of SrFeAsF and their implications

Sr3Sc2Fe2As2O5as

Superconductivity induced by doping platinum inBaFe2As2

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