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Jaroszyński, J.; Riggs, Scott; Hunte, Frank; Gurevich, A.; Larbalestier, D. C.; Boebinger, G. S.; Balakirev, Fedor; Migliori, A.; Ren, Zhi-An; Lü, Wei; Yang, Jie; Shen, Xiaoli; Dong, Xianlin; Zhao, Zhongxian; Jin, Rongying; Sefat, Athena S.; McGuire, Michael A.; Sales, B. C.; Christen, D. K.; Mandrus, David

doi:10.1103/physrevb.78.064511

Cited by 128 publications

(121 citation statements)

References 24 publications

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“…Single crystals of (Ba,K)Fe 2 As 2 also have achieved high J c over 1x10 6 A/cm 2 [15][16][17]. The fact that these values are almost the same level as commercially used NbTi or Nb 3 Sn wires makes IBSs very promising for high-field applications [18].…”

mentioning

confidence: 80%

Enhancement of critical current densities in (Ba,K)Fe₂As₂wires and tapes using HIP technique

Pyon

Suwa

Park

et al. 2016

Supercond. Sci. Technol.

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Abstract(Ba,K)Fe 2 As 2 superconducting wires and tapes are fabricated by using hot isostatic pressing (HIP) technique, and their superconducting properties are studied. In the HIP round wire, transport critical current density (J c ) at 4.2 K has achieved record-high value of 175 kA/cm 2 at zero field, and exceeds 20 kA/cm 2 even at 100 kOe. Improvement of polycrystalline powder synthesis may play a key role for the enhancement of J c . In the HIP tape, even larger transport J c of 380 kA/cm 2 is realized at zero field. Based on magnetization and magneto-optical measurements, possible further enhancement of J c is discussed.

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mentioning

confidence: 80%

Enhancement of critical current densities in (Ba,K)Fe₂As₂wires and tapes using HIP technique

Pyon

Suwa

Park

et al. 2016

Supercond. Sci. Technol.

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“…Hunte et al reported that even the La Fe-oxypnictide with Tc ~ 26 K exhibits a very high upper critical field H c2 of ~65 T [6] while H c2 over 200 T was deduced for the Sm and Nd Fe-oxypnictides [17], strongly suggesting a large high field domain for the Fe-oxypnictides. Foreseeing practical applications, there has been immediate interest in the critical current density too.…”

Section: Introductionmentioning

confidence: 99%

“…The discovery of superconductivity in the LaFeAsO 1-x F x compound [1] has been followed by rapid exploration of many aspects of the superconducting behaviour of the broad class of rare earth iron oxypnictides [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] whose transition temperature T c can reach above 40 K when La is replaced by Ce [5] and above 50 K when the rare earth is Pr, Nd, Sm and Gd [7][8][9][10][11]. Hunte et al reported that even the La Fe-oxypnictide with Tc ~ 26 K exhibits a very high upper critical field H c2 of ~65 T [6] while H c2 over 200 T was deduced for the Sm and Nd Fe-oxypnictides [17], strongly suggesting a large high field domain for the Fe-oxypnictides.…”

Section: Introductionmentioning

confidence: 99%

Combined microstructural and magneto-optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides

Kametani

Polyanskii

Yamamoto

et al. 2008

Supercond. Sci. Technol.

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In order to understand why the inter-and intra-granular current densities of polycrystalline superconducting oxypnictides differ by three orders of magnitude, we have conducted combined magneto-optical and microstructural examinations of representative randomly oriented polycrystalline Nd and Sm single-layer oxypnictides. Magneto optical images show that the highest J c values are observed within single grains oriented with their c axes perpendicular to the observation plane, implying that the intragranular current is anisotropic. The much lower intergranular J c is at least partially due to many extrinsic factors, because cracks and a ubiquitous wetting As-Fe phase are found at many grain boundaries. However, some grain boundaries are structurally clean under high resolution transmission electron microscopy examination. Because the whole-sample global J c (

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“…Then, the Fe superconductors appear to be in an intermediate regime of couplings, somewhere in between, e.g., MgB 2 and the Cu oxide superconductors. 19,20 The "antiferromagnetic metallic" nature of LaOFeAs is clearly different from an antiferromagnetic insulator or a non-magnetic metal. Further confirming the need to focus on the intermediate coupling regime for the Fe pnictides parent compounds, a pseudogap has been observed 21,22,23,24 in their density of states (DOS), which is different from the featureless DOS of a good metal or the gapped DOS of an insulator.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and metallic state at intermediate HubbardUcoupling in multiorbital models for undoped iron pnictides

Trinh

Moreo

et al. 2009

Phys. Rev. B

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Multi-orbital Hubbard model Hamiltonians for the undoped parent compounds of the Fe-pnictide superconductors are here investigated using mean-field techniques. For a realistic four-orbital model, our results show the existence of an intermediate Hubbard U coupling regime where the mean-field ground state has spin stripe magnetic order, as in neutron scattering experiments, while remaining metallic, due to the phenomenon of band overlaps. The angle-resolved photoemission intensity and Fermi surface of this magnetic and metallic state are discussed. Other models are also investigated, including a two orbital model where not only the mean-field technique can be used, but also Exact Diagonalization in small clusters and the Variational Cluster Approximation in the bulk. The combined results of the three techniques point toward the existence of an intermediate-coupling magnetic and metallic state in the two-orbital model, similar to the intermediate coupling meanfield state of the four-orbital model. We conclude that the state discussed here is compatible with the experimentally known properties of the undoped Fe-pnictides.

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Comparative high-field magnetotransport of the oxypnictide superconductorsRFeAsO1−xFx(R

Cited by 128 publications

References 24 publications

Enhancement of critical current densities in (Ba,K)Fe₂As₂wires and tapes using HIP technique

Enhancement of critical current densities in (Ba,K)Fe₂As₂wires and tapes using HIP technique

Combined microstructural and magneto-optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides

Magnetic and metallic state at intermediate HubbardUcoupling in multiorbital models for undoped iron pnictides

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Comparative high-field magnetotransport of the oxypnictide superconductorsRFeAsO1−xFx(R

Cited by 128 publications

References 24 publications

Enhancement of critical current densities in (Ba,K)Fe2As2wires and tapes using HIP technique

Enhancement of critical current densities in (Ba,K)Fe2As2wires and tapes using HIP technique

Combined microstructural and magneto-optical study of current flow in polycrystalline forms of Nd and Sm Fe-oxypnictides

Magnetic and metallic state at intermediate HubbardUcoupling in multiorbital models for undoped iron pnictides

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Enhancement of critical current densities in (Ba,K)Fe₂As₂wires and tapes using HIP technique

Enhancement of critical current densities in (Ba,K)Fe₂As₂wires and tapes using HIP technique