Superconductivity and magnetism in platinum-substituted<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>single crystals

Kirshenbaum, Kevin; Saha, Shanta; Paglione, Johnpierre

doi:10.1103/physrevb.82.144518

Cited by 20 publications

(22 citation statements)

References 34 publications

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“…Superconductivity emerges upon 5d transition-metal Pt substituting on the Fe site as in the case of Pt-doped 122-type Fe-pnictide superconductors. 21,22 T c reaches its maximum ∼13.6 K at the doping level x ∼ 0.06, and further doping slowly suppresses T c . The overdoped samples gradually exhibit a phase separation so that the SC region is not a perfect dome-shaped one.…”

Section: Introductionmentioning

confidence: 98%

Transport properties and electronic phase diagram of single-crystallineCa10(Pt3As8)

et al. 2012

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Sizable single-crystalline samples of Ca 10 (Pt 3 As 8 )((Fe 1−x Pt x ) 2 As 2 ) 5 (the 10-3-8 phase) with 0 x < 0.1 have been grown and have been systematically characterized via x-ray diffraction, magnetic, and transport measurements. The unsubstituted sample is a heavily doped semiconductor with no sign of magnetic order down to 2 K. With increasing Pt content, the metallic behavior appears, and superconductivity is realized for x 0.023. T c rises to its maximum of approximately 13.6 K at the doping level of x ∼ 0.06 and then decreases for higher x values. The electronic phase diagram of the 10-3-8 phase was mapped out based on the magnetic and transport measurements. The mass anisotropy parameter ∼ 10, obtained from resistive measurements in magnetic fields, indicates a relatively large anisotropy in the iron-based superconductor family. This strong two-dimensional character may lead to the absence of magnetic order. A linear T dependence of susceptibility at high temperatures is observed, indicating that spin fluctuations exist in the underdoped region as in most of the Fe-pnictide superconductors.

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Section: Introductionmentioning

confidence: 98%

Transport properties and electronic phase diagram of single-crystallineCa10(Pt3As8)

et al. 2012

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“…28 and 29) and SrFe 2−x Pt x As 2 (Ref. 30) [for which the maximal T c at ∼23 K and ∼16 K was achieved at x = 0.05 (Ref. 29) and 0.…”

Section: Introductionmentioning

confidence: 98%

Electronic band structure, Fermi surface, and elastic properties of polymorphs of the 5.2 K iron-free superconductorSrPt2As2from first-principles calculations

Shein

Ivanovskiĭ

2011

Phys. Rev. B

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By means of first-principles calculations, we studied in detail the structural, elastic, and electronic properties of the tetragonal CaBe 2 Ge 2 -type 5.2 K superconductor SrPt 2 As 2 in comparison with two hypothetical SrPt 2 As 2 polymorphs with ThCr 2 Si 2 -type structures, which differ in the atomic configurations of the [Pt 2 As 2 ] (or [As 2 Pt 2 ]) blocks. We found that CaBe 2 Ge 2 -type SrPt 2 As 2 is a unique system with near-Fermi bands of a complicated character and an "intermediate"-type Fermi surface, which consists of electronic pockets having a cylinderlike [two-dimensional (2D)] topology (typical of 122 FeAs phases) together with 3D-like electronic and hole pockets, which are characteristic of ThCr 2 Si 2 -like iron-free low-T c superconductors. Our analysis revealed that, as distinct from ThCr 2 Si 2 -like 122 phases, other features of CaBe 2 Ge 2 -like SrPt 2 As 2 are as follows: (1) There are essential differences in the contributions from [Pt 2 As 2 ] and [As 2 Pt 2 ] blocks to the near-Fermi region; conduction is anisotropic and occurs mainly in the [Pt 2 As 2 ] blocks. (2) A 3D system of strong covalent Pt-As bonds is formed (inside and between [Pt 2 As 2 ] and [As 2 Pt 2 ] blocks), which is responsible for enhanced stability of this polymorph.(3) There is essential charge anisotropy between adjacent [Pt 2 As 2 ] and [As 2 Pt 2 ] blocks. We also predict that CaBe 2 Ge 2 -like SrPt 2 As 2 is a mechanically stable and relatively soft material with high compressibility, which will behave in a ductile manner. In contrast, the ThCr 2 Si 2 -type SrPt 2 As 2 polymorphs, which contain only [Pt 2 As 2 ] or [As 2 Pt 2 ] blocks, are less stable, have Fermi surfaces of a multisheet three-dimensional type like the ThCr 2 Si 2 -like iron-free 122 phases, and therefore will be ductile materials with high elastic anisotropy. Based on our data for the three simplest SrPt 2 As 2 polymorphs we assume that there may exist a family of higher-order polytypes, which can be formed as a result of various stackings of the two main types of building blocks ([Pt 2 As 2 ] and [As 2 Pt 2 ]) in various combinations along the z axis. This may provide an interesting platform for further theoretical and experimental search for other superconducting materials.

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“…This means that (CaFeAs) 10 Pt 3 As 8 is the actual parent compound of this class of materials. Doping with Pt creates superconductivity up to T c ≈ 15 K which is in the typical range of other Pt‐doped iron arsenides, e.g., Sr(Fe 1− x Pt x ) 2 As 2 exhibits T c = 16 K at x ≈ 0.08 .…”

Section: The 1038 Parent Compound and La‐dopingmentioning

confidence: 93%

Iron arsenide superconductors (CaFeAs)₁₀M_nAs₈ with metallic interlayers (M = Pt, Pd; n = 3, 4)

Stürzer

Johrendt

2016

Physica Status Solidi (b)

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The compounds referred to as 1038 and 1048 phases (CaFeAs)10PtnAs8 (n = 3,4) are the structurally most complex iron arsenide superconductors and the first examples with metallic interlayers. The electronic subsystems of FeAs and PtnAs8 layers hardly interact and the contribution of the metallic PtnAs8 interlayers to the Fermi surface is so small that the typical nesting is not degraded. (CaFeAs)10Pt3As8 is the parent compound of the 1038/1048 materials which undergoes the typical magneto‐structural phase transition in spite of the already triclinic lattice. Superconductivity is controlled by the same doping mechanisms as known from simpler FeAs systems. High critical temperatures up to 38 K occur in both 1038 and 1048 phases if the FeAs layers are clean (free from Pt) and electron doped by charge transfer either from Pt4As8 in 1048 or by rare‐earth doping of the calcium layer in 1038 compounds. The presence of two negatively charged layers (FeAs)δ− and (PtnAs8)δ− which compete for the electrons transferred from the Ca2+ ions is unique in the family of iron arsenide superconductors. Geometric incompatibilities of the FeAs and PtnAs8 slabs cause severe stacking disorder. The robustness of superconductivity against low lattice symmetry and significant structural imperfection of the interlayer is quite remarkable and underlines that the FeAs slabs are the key in controlling and understanding high‐temperature superconductivity in iron arsenides. Crystal structure of (CaFeAs)10Pt3As8 and the Pt3As8 layer.

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Superconductivity and magnetism in platinum-substitutedSrFe2As2single crystals

Cited by 20 publications

References 34 publications

Transport properties and electronic phase diagram of single-crystallineCa10(Pt3As8)

Transport properties and electronic phase diagram of single-crystallineCa10(Pt3As8)

Electronic band structure, Fermi surface, and elastic properties of polymorphs of the 5.2 K iron-free superconductorSrPt2As2from first-principles calculations

Iron arsenide superconductors (CaFeAs)₁₀M_nAs₈ with metallic interlayers (M = Pt, Pd; n = 3, 4)

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Superconductivity and magnetism in platinum-substitutedSrFe2As2single crystals

Cited by 20 publications

References 34 publications

Transport properties and electronic phase diagram of single-crystallineCa10(Pt3As8)

Transport properties and electronic phase diagram of single-crystallineCa10(Pt3As8)

Electronic band structure, Fermi surface, and elastic properties of polymorphs of the 5.2 K iron-free superconductorSrPt2As2from first-principles calculations

Iron arsenide superconductors (CaFeAs)10MnAs8 with metallic interlayers (M = Pt, Pd; n = 3, 4)

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Iron arsenide superconductors (CaFeAs)₁₀M_nAs₈ with metallic interlayers (M = Pt, Pd; n = 3, 4)