Effect of the isoelectronic substitution of Sb for As on the magnetic and structural properties of LaFe(As<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>Sb<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>)O

Carlsson, Sandra; Lévy-Bertrand, F.; Marcenat, C.; Sulpice, A.; Marcus, J.; Pairis, Sébastien; Klein, Thierry; Núñez-Regueiro, M.; Garbarino, Gastón; Hansen, Thomas C.; Nassif, Vivian; Toulemonde, Pierre

doi:10.1103/physrevb.84.104523

Cited by 17 publications

(10 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We note that an opposite behavior has been reported in LaFeAsO when As is substituted isoelectronically by Sb: T N decreases also monotonously with antimony substitution, corresponding to an increase of the equivalent Fe-(As,Sb) bond length 39 . This behavior results from a complex competition between different magnetic interactions in the system, i.e.…”

Section: E Discussioncontrasting

confidence: 56%

Dependence of the structural and physical properties of Tl1-yFe2-z(Se1-xSx)2 with isovalent substitution of Se by S: decrease of TNeel with S content

Toulemonde,

Santos-Cottin,

Lepoittevin

et al. 2012

Preprint

Self Cite

View full text Add to dashboard Cite

The effect of selenium substitution by sulfur or tellurium in the Tl1−yFe2−zSe2 antiferromagnet was studied by x-ray and electron diffraction, magnetization and transport measurements. Tl0.8Fe1.5(Se1−xXx)2 (nominal composition) solid solutions were synthesized in the full x range (0 ≤ x ≤ 1) for X = S and up to x = 0.5 for X = Te, using the sealed tube technique. No superconductivity was found down to 4.2K in the case of sulfur despite the fact that the optimal crystallographic parameters, determined by Rietveld refinements, are reached in the series (i.e. the Fe-(Se,S) interplane height and (Se,S)-Fe-(Se,S) angle for which the critical superconducting transition Tc is usually maximal in pnictides). Quasi full Tl site (y ∼ 0.05) compared to significant alkaline deficiency (y = 0.2 − 0.3) in analogous A1−yFe2−zSe2 (A = K, Rb, Cs), and the resulting differences in iron valency, density of states and doping, are suggested to explain this absence of superconductivity. Compounds substituted with tellurium, at least up to x=0.25, show superconducting transitions but probably due to tetragonal Fe(Se,Te) impurity phase. Transmission electron microscopy confirmed the existence of ordered iron vacancies network in the samples from the Tl0.8Fe1.5(Se1−xSx)2 series in the form of the tetragonal √ 5 a × √ 5 a × c superstructure (I4/m) (mixed with the orthorhombic √ 2 a ×2 √ 2 a × c form (Ibam) if the iron vacancies level is increased). The Néel temperature (TN ) indicating the onset of antiferromagnetism order in the √ 5 a × √ 5 a × c supercell decreases from 450K in the selenide (x=0) to 330K in the sulfide (x=1). We finally demonstrate a direct linear relationship between T N éel and the Fe-(Se,S) bond length (or Fe-(Se,S) height).

show abstract

Section: E Discussioncontrasting

confidence: 56%

Dependence of the structural and physical properties of Tl1-yFe2-z(Se1-xSx)2 with isovalent substitution of Se by S: decrease of TNeel with S content

Toulemonde,

Santos-Cottin,

Lepoittevin

et al. 2012

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…In Nd-P0.05 and Nd-Sb0.05 samples, it can be seen two weak peaks in 27.52° and 28.59°. These mentioned peaks have not been considered by other research works [36,21,37,38]. We were refined X-ray diffraction data of substituted samples by the NdAs, FeAs, Nd 2 O 3 , NdOF, FeAs 2 and many undesirable phases of crystal information files (cif file) but the mentioned peaks were not covered by MAUD refinement of the Nd-P0.05…”

Section: Resultsmentioning

confidence: 95%

Isovalent Substitution Effects of Arsenic on Structural and Electrical Properties of Iron-Based Superconductor NdFeAsO0.8F0.2

Alborzi

Daadmehr

2019

J Supercond Nov Magn

View full text Add to dashboard Cite

In this paper, nominal compositions of NdFeAsO 0.8 F 0.2 , NdFeAs 0.95 Sb 0.05 O 0.8 F 0.2 and NdFeAs 0.95 P 0.05 O 0.8 F 0.2 were prepared by one-step solid-state reaction method. The structural, electrical and morphological properties of samples were characterized through the XRD pattern, the 4-probe method and SEM, respectively. The crystal structure of our samples was tetragonal with P4/nmm:2 symmetry group. Also, the (x, y, z), occupancy of ions and lattice parameters were changed by isovalent substitution of Phosphorus (P) and Antimony (Sb)in the NdFeAsO 0.8 F 0.2 sample. The ⍺, β bond angles and Fe-As bond length are changed from the corresponding value of ⍺ and β regular FeAs4-tetrahedron by isovalent doping P/As and Sb/As, that they are effective on the superconductivity transition temperature. The microstrain and crystalline size of samples were studied by the Williamson Hall method. The superconducting critical temperatures were attained at 56 K and 46 K for NdFeAsO 0.8 F 0.2 , NdFeAs 0.95 Sb 0.05 O 0.8 F 0.2 , respectively. The NdFeAs 0.95 P 0.05 O 0.8 F 0.2 showed the structural transition temperature at 140 K. It seems that there is a relation between the superconductivity and shrinkage of the crystal lattice. The flake-type of grains was observed by SEM pictures of samples.

show abstract

“…In a recent report, the isoelectronic substitution of Sb for As in LaFeAsO reduces the structural and magnetic transition temperatures, but it does not induce superconductivity. 47 An NMR study on LaFe 1−x Ru x AsO sees the dilution of antiferromagnetism with Ru doping, but without the emergence of superconductivity. 48 The electronic and structural properties, such as the anion height from the Fe layer, and the bonding angle between the anion and the Fe may also need to be optimized in order to have robust superconductivity.…”

Section: A Tuning Of the Magnetic Ordermentioning

confidence: 99%

Magnetic order tuned by Cu substitution in Fe1.1−zCuzTe

Wen

et al. 2012

Phys. Rev. B

View full text Add to dashboard Cite

We study the effects of Cu substitution in Fe1.1Te, the non-superconducting parent compound of the iron-based superconductor, Fe1+yTe1−xSex, utilizing neutron scattering techniques. It is found that the structural and magnetic transitions, which occur at ∼ 60 K without Cu, are monotonically depressed with increasing Cu content. By 10% Cu for Fe, the structural transition is hardly detectable, and the system becomes a spin glass below 22 K, with a slightly incommensurate ordering wave vector of (0.5-δ, 0, 0.5) with δ being the incommensurability of 0.02, and correlation length of 12Å along the a axis and 9Å along the c axis. With 4% Cu, both transition temperatures are at 41 K, though short-range incommensurate order at (0.42, 0, 0.5) is present at 60 K. With further cooling, the incommensurability decreases linearly with temperature down to 37 K, below which there is a first order transition to a long-range almost-commensurate antiferromagnetic structure. A spin anisotropy gap of 4.5 meV is also observed in this compound. Our results show that the weakly magnetic Cu has large effects on the magnetic correlations; it is suggested that this is caused by the frustration of the exchange interactions between the coupled Fe spins.

show abstract

Effect of the isoelectronic substitution of Sb for As on the magnetic and structural properties of LaFe(As1−xSbx)O

Cited by 17 publications

References 54 publications

Dependence of the structural and physical properties of Tl1-yFe2-z(Se1-xSx)2 with isovalent substitution of Se by S: decrease of TNeel with S content

Dependence of the structural and physical properties of Tl1-yFe2-z(Se1-xSx)2 with isovalent substitution of Se by S: decrease of TNeel with S content

Isovalent Substitution Effects of Arsenic on Structural and Electrical Properties of Iron-Based Superconductor NdFeAsO0.8F0.2

Magnetic order tuned by Cu substitution in Fe1.1−zCuzTe

Contact Info

Product

Resources

About