Effect of pressure on the magnetostructural transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>SrFe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Kumar, Manoj; Nicklas, M.; Jesche, Anton; Caroca‐Canales, N.; Schmitt, M.; Hanfland, M.; Kasinathan, Deepa; Schwarz, Ulrich; Rösner, H.; Geibel, C.

doi:10.1103/physrevb.78.184516

Cited by 68 publications

(80 citation statements)

References 32 publications

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“…20,[32][33][34] This transition breaks the structure's tetragonal symmetry through a structural distortion which causes the re-TABLE II. Results of Rietveld refinements from room temperature and 10K x-ray (11BM-B) and neutron (POWGEN)data.…”

Section: Temperature Dependence Of Structural Parametersmentioning

confidence: 99%

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2
Taddei
¹
,
Allred
²
,
Bugaris
³

et al. 2016
Phys. Rev. B
41
9
50
1
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The recently discovered C4 tetragonal magnetic phase in hole-doped members of the iron-based superconductors provides new insights into the origin of unconventional superconductivity. Previously observed in Ba1-xAxFe2As2 (with A = K, Na), the C4 magnetic phase exists within the well studied C2 spin-density wave (SDW) dome, arising just before the complete suppression of antiferromagnetic (AFM) order but after the onset of superconductivity. Here, we present detailed x-ray and neutron diffraction studies of Sr1−xNaxFe2As2 (0.10 ≤ x ≤ 0.60) to determine their structural evolution and the extent of the C4 phase. Spanning ∆x ∼ 0.14 in composition, the C4 phase is found to extend over a larger range of compositions, and to exhibit a significantly higher transition temperature, Tr ∼ 65K, than in either of the other systems in which it has been observed. The onset of this phase is seen near a composition (x ∼ 0.30) where the bonding angles of the Fe2As2 layers approach the perfect 109.46• tetrahedral angle. We discuss the possible role of this return to a higher symmetry environment for the magnetic iron site in triggering the magnetic reorientation and the coupled re-entrance to the tetragonal structure. Finally, we present a new phase diagram, complete with the C4 phase, and use its observation in a third hole-doped 122 system to suggest the universality of this phase.

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Section: Temperature Dependence Of Structural Parametersmentioning

confidence: 99%

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2
Taddei
¹
,
Allred
²
,
Bugaris
³

et al. 2016
Phys. Rev. B
41
9
50
1
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“…The pressure-induced superconductivity have also been reported in Fe-As compounds having a ThCr 2 Si 2 -type tetragonal structure. [10][11][12][13][14][15][16] The anomaly due to the pressure-induced superconductivity is also detected by the electrical resistivity measurements under high pressures up to 29 GPa using the DAC, as shown in Fig. 4.…”

Section: Letters Figures 3(a) and 3(b)mentioning

confidence: 99%

Superconductivity under High Pressure in LaFeAsO

et al. 2008

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Electrical resistivity measurements under high pressures up to 29 GPa were performed for oxypnictide compound LaFeAsO. We found a pressure-induced superconductivity in LaFeAsO. The maximum value of T c is 21 K at $12 GPa. The pressure dependence of the T c is similar to those of LaFeAsO 1Àx F x series reported previously.KEYWORDS: superconductivity, high pressure, electrical resistivity, oxypnictide, LaFeAsO DOI: 10.1143/JPSJ.77.113712Recent discovery of Fe-based oxypnictide superconductor LaFeAsO 1Àx F x with superconducting transition temperature T c of $26 K has attracted great interests in the field of condensed matter physics.1) The crystal structure of LaFeAsO 1Àx F x is a tetragonal ZrCuSiAs-type structure (P4=nmm), and is composed of a stack of insulating LaO and conducting FeAs layers. It is thought that conductive carriers are confined two dimensionally in the FeAs layers and the carrier concentration can be increased by the substitution of O 2À by F À . The parent compound LaFeAsO is metallic and undergoes a structural phase transition at $160 K and a magnetic phase transition at $140 K.2,3) The crystal structure changes from the tetragonal to orthorhombic, then the compound exhibits a spin density wave type antiferromagnetic (AFM) ordering. The structural distortion and the magnetic ordering are suppressed by the F substitution, resulting in the emergence of the superconductivity.Right after the discovery of the superconductivity in LaFeAsO 1Àx F x , it was reported that the T c of LaFeAsO 0:89 F 0:11 shows large pressure effect and increases to a maximum of 43 K at 4 GPa, suggesting that the lattice contraction is effective in the enhancement of the T c of oxypnictide compounds. 4) Actually, RFeAsO (R = rare earth) having smaller R atom than La atom shows the T c over 50 K. 5,6) It is known that external pressure can control carrier concentration in CuO 2 plane of high-T c cupper oxides. 7) In order to understand the effect of external pressure on T c in LaFeAsO 1Àx F x and clarify similarities and differences between the external pressure effect and the F substitution effect, we have performed electrical resistivity measurements under high pressures up to 29 GPa for the parent compound LaFeAsO. In this paper, we report a pressure-induced superconductivity in LaFeAsO with a maximum T c of 21 K.A polycrystalline sample was prepared by a solid state reaction method.1,2) The sample was confirmed to be mostly composed of a single phase of the ZrCuSiAs-type tetragonal structure with lattice constants of a ¼ 0:403268ð1Þ nm and c ¼ 0:874111ð4Þ nm at room temperature.2) Electrical resistivity measurements under high pressures up to 1.5 and 12 GPa were performed by a standard dc four-probe technique using a piston-cylinder type pressure cell and a cubic anvil cell, respectively. 8) A liquid pressure-transmitting medium (Fluorinert FC70 : FC77 ¼ 1 : 1) was used to maintain hydrostatic conditions. A diamond anvil cell (DAC) made of CuBe alloy was used for electrical resistivity measurements under high pressure...

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“…Superconductivity has also been found in isovalent chemical substitution, substituting Ru for Fe, or P for As, in BaFe 2 As 2 19-22 . However, chemical substitution is not the only way to induce superconductivity in the iron-based superconductors; the suppression of magnetic order and the onset of superconductivity have also been shown to occur in the parent compounds under pressure 23,24 and lattice strain 25 . Recently superconductivity has been discovered with a transition temperature T c of 23 K in single-crystal samples of BaFe 2 As 2 with 5% Fe substituted by Pt (Ref.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and magnetism in platinum-substitutedSrFe2As2single crystals

Kirshenbaum¹,

Saha²,

Paglione³

2010

Phys. Rev. B

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Single crystals of SrFe2−xPtxAs2 (0 ≤ x ≤ 0.36) were grown using the self flux solution method and characterized using x-ray crystallography, electrical transport, magnetic susceptibility, and specific heat measurements. The magnetic/structural transition is suppressed with increasing Pt concentration, with superconductivity seen over the range 0.08 ≤ x ≤ 0.36 with a maximum transition temperature Tc of 16 K at x = 0.16. The shape of the phase diagram and the changes to the lattice parameters are similar to the effects of other group VIII elements Ni and Pd, however the higher transition temperature and extended range of superconductivity suggest some complexity beyond the simple electron counting picture that has been discussed thus far.

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Effect of pressure on the magnetostructural transition inSrFe2As2

Cited by 68 publications

References 32 publications

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2
Taddei
¹
,
Allred
²
,
Bugaris
³

et al. 2016
Phys. Rev. B
41
9
50
1
View full text Add to dashboard Cite

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2
Taddei
¹
,
Allred
²
,
Bugaris
³

et al. 2016
Phys. Rev. B
41
9
50
1
View full text Add to dashboard Cite

Superconductivity under High Pressure in LaFeAsO

Superconductivity and magnetism in platinum-substitutedSrFe2As2single crystals

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Effect of pressure on the magnetostructural transition inSrFe2As2

Cited by 68 publications

References 32 publications

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2Taddei1, Allred2, Bugaris3 et al. 2016Phys. Rev. B419501View full textAdd to dashboardCite

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2Taddei1, Allred2, Bugaris3 et al. 2016Phys. Rev. B419501View full textAdd to dashboardCite

Superconductivity under High Pressure in LaFeAsO

Superconductivity and magnetism in platinum-substitutedSrFe2As2single crystals

Contact Info

Product

Resources

About

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2
Taddei
¹
,
Allred
²
,
Bugaris
³

et al. 2016
Phys. Rev. B
41
9
50
1
View full text Add to dashboard Cite

Detailed magnetic and structural analysis mapping a robust magneticC4dome inSr1−xNaxFe2
Taddei
¹
,
Allred
²
,
Bugaris
³

et al. 2016
Phys. Rev. B
41
9
50
1
View full text Add to dashboard Cite