Magnetic and transport properties of iron-platinum arsenide Ca<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>10</mml:mn></mml:msub></mml:math>(Pt<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>4</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:math>As<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>8</mml:mn>

Ding, Qing-Ping; Tsuchiya, Yuji; Mohan, Shyam; Taen, Toshihiro; Nakajima, Yasuyuki; Tamegai, T.

doi:10.1103/physrevb.85.104512

Cited by 24 publications

(34 citation statements)

References 53 publications

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“…Figures 8(a)-(c) show the MO images of Ca 0.755 La 0.245 Fe 0.987 Pd 0.013 As 2 single crystal in the remnant state at 5, 10, and 15 K, respectively. At lower temperatures, the field fully penetrates the sample, and the MO image manifests a typical roof-top pattern, similar to that observed in Ba(Fe 1-x Co x ) 2 As 2 , FeTe 0.6 Se 0.4 , Ca 10 (Pt 4-δ As 8 )(Fe 2-x Pt x As 2 ) 5 and CaKFe 4 As 4 single crystals [52][53][54][55], indicating the homogeneous current flow throughout the sample. Figure 8(d) shows profiles of the magnetic induction at different temperatures along the red dashed line shown in figure 8(a).…”

Section: T-x Phase Diagramsupporting

confidence: 67%

“…values of Γ close to T c are around 5, comparable to that of Co doped Ca 1-x La x FeAs 2 [24,35], and lower than that of 10-3-8 and 10-4-8-type IBSs which has similar FeAs interlayer distance but insulating space layers [54,57], indicating a stronger FeAs interlayer coupling in 112-type IBSs arising from the metallic spacer layers. Moreover, as an accumulation of knowledge, the temperature dependence of the irreversibility fields H irr are also well fitted by the expressions = -…”

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confidence: 78%

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Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca_0.755La_0.245FeAs₂

Xing

Veshchunov

et al. 2019

New J. Phys.

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In 112-type iron-based superconductors (IBSs), rare earth (e.g. La) doping enhanced antiferromagnetic (AFM) order and 3d transition-metal (e.g. Co, Ni) doping induced reemergence of superconductivity (SC) in the over-doped regime (non-SC) are of particular interest, providing a significant opportunity to further understand the relationship between SC and AFM order in IBSs. Recently, 4d transition-metal Pd-doped 112-type Ca 1-y La y Fe 1-x Pd x As 2 (x>0.2, 0y0.3) compounds, which crystallized in new orthorhombic and tetragonal structures, have been identified (Inorg. Chem. 56 3030 (2017)). However, none of them exhibit SC, probably due to the oversubstitution of Pd for Fe. Here, to reveal the impact of slight Pd doping on the over-doped Ca 1-y La y FeAs 2 and compare to 3d Co/Ni doping series, single crystals of Ca 0.755 La 0.245 Fe 1-x Pd x As 2 with 0x0.08 are successfully grown using the self-flux method. We find that, upon only a small amount of Pd doping (x=0.013), bulk SC with a maximum T c of 28.5 K is reemerged, in contrast to the case with high Pd doping level. Moreover, based on the electrical resistivity and magnetization data, we construct the temperaturecomposition (T-x) phase diagram, the shape of which, particularly for the region where the AFM and SC phases coexist microscopically, is almost identical to that of Ca 0.76 La 0.24 Fe 1-x Ni x As 2 , but is distinctly different from that of Ca 0.74 La 0.26 Fe 1-x Co x As 2 , presumably due to the presence of complex doping mechanism in 112-type IBSs. Finally, for one selected single crystal with x=0.013, superconducting properties including critical current density, vortex pinning mechanism, and vortex diagram are systematically studied by magnetization, magneto-optical imaging, and magnetoresistivity measurements. Our work provided more insight into the phase diagrams and superconducting properties of 112-type IBSs, allowing better understanding of its superconducting mechanism and developing the potential applications.

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Section: T-x Phase Diagramsupporting

confidence: 67%

mentioning

confidence: 78%

Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca_0.755La_0.245FeAs₂

Xing

Veshchunov

et al. 2019

New J. Phys.

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“…It is noted that the shape of μ 0 H c2 ( T ) curve does not change qualitatively when μ 0 H c2 ( T ) is defined by different criteria in this compound. In addition, a slight upward behavior near T c which commonly observed in some IBSs143334, is also observed for both directions, might be due to the flux dynamics as is seen in cuprates35.…”

Section: Resultsmentioning

confidence: 54%

Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors

Xing

Zhou

Wang

et al. 2017

Sci Rep

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The temperature dependence of upper critical field μ0Hc2 of Ca0.83La0.17FeAs2 and Ca0.8La0.2Fe0.98Co0.02As2 single crystals are investigated by measuring the resistivity for the inter-plane (H//c) and in-plane (H//ab) directions in magnetic fields up to 60 T. It is found that μ0Hc2(T) of both crystals for H//c presents a sublinear temperature dependence with decreasing temperature, whereas the curve of μ0Hc2(T) for H//ab has a convex curvature and gradually tends to saturate at low temperatures. μ0Hc2(T) in both crystals deviates from the conventional Werthamer-Helfand-Hohenberg (WHH) theoretical model without considering spin paramagnetic effect for H//c and H//ab directions. Detailed analyses show that the behavior of μ0Hc2(T) in 112-type Iron-based superconductors (IBSs) is similar to that of most IBSs. Two-band model is required to fully reproduce the behavior of μ0Hc2(T) for H//c, while the effect of spin paramagnetic effect is responsible for the behavior of μ0Hc2(T) for H//ab.

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“…Tape [82] Tape [80] Tape [79] Tape [63] Wire [52] Wire [50] Wire [51] Wire [46] Tape [72] Wire [91] Tape [92] 4.2 K Tape [95] Wire [99] Wire [93] Wire [98] Tape [97] Wire [99] …”

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confidence: 99%

Progress in wire fabrication of iron-based superconductors

Ma¹

2012

Supercond. Sci. Technol.

219

192

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Abstract:Iron-based superconductors, with T c values up to 55 K, are of great interest for applications, due to their lower anisotropies and ultrahigh upper critical fields. In the past 4 years, great progress has been made in the fabrication of iron-based superconducting wires and tapes using the powder-in-tube (PIT) processing method, including main three types of 122, 11, and 1111 iron-based parent compounds. In this article, an overview of the current state of development of iron-based superconducting wires and tapes is presented. We focus on the fabrication techniques used for 122 pnictide wires and tapes, with an emphasis on their meeting the critical current requirements for making high-performance conductors, such as a combination of using Ag sheath, addition element and optimized heat treatment to realize high J c , ex situ process employed to reduce non-superconducting phases and to obtain a high relative density, and a texture control to improve grain connectivity. Of particular interest is that so far transport J c values above 10 4 A/cm 2 at 4.2 K and 10 T are obtained in 122 type tapes, suggesting that they are prospective candidates for high-field applications. Finally, a perspective and future development of PIT pnictide wires are also given.*

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Magnetic and transport properties of iron-platinum arsenide Ca10(Pt4−δAs8

Cited by 24 publications

References 53 publications

Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca_0.755La_0.245FeAs₂

Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca_0.755La_0.245FeAs₂

Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors

Progress in wire fabrication of iron-based superconductors

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Magnetic and transport properties of iron-platinum arsenide Ca10(Pt4−δAs8

Cited by 24 publications

References 53 publications

Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca0.755La0.245FeAs2

Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca0.755La0.245FeAs2

Two-band and pauli-limiting effects on the upper critical field of 112-type iron pnictide superconductors

Progress in wire fabrication of iron-based superconductors

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Product

Resources

About

Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca_0.755La_0.245FeAs₂

Reemergence of superconductivity by 4d transition-metal Pd doping in over-doped 112-type iron pnictide superconductors Ca_0.755La_0.245FeAs₂