Thorium-doping–induced superconductivity up to 56 K in Gd
                    <sub>1−x</sub>
                    Th
                    <sub>x</sub>
                    FeAsO

Wang, Cao; Li, Linjun; Chi, Shun; Zhu, Zengwei; Ren, Zhi; Li, Yuke; Wang, Yuetao; Lin, Xin; Luo, Yongkang; Jiang, Shuai; Xu, Xiangfan; Cao, Guang‐Han; Xu, Zhu-An

doi:10.1209/0295-5075/83/67006

Cited by 643 publications

(535 citation statements)

References 20 publications

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“…The highest T c reached 57 K to date in the F doped SmFeAsO, which crystallizes into the ZrCuSiAs-type structure [2,3]. Subsequently, many related Fe based compounds comprising the Fe 2 X 2 layer (X: pnictogen or chalcogen) and some were found to show SC by chemical or physical doping within first few years.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

et al. 2011

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Additional charge carriers were introduced to the iron oxyarsenide Sr 4 Sc 2 Fe 2 As 2 O 6 under a high-pressure condition, followed by measurements of electrical resistivity, Hall coefficient, and magnetic susceptibility. The host compound Sr 4 Sc 2 Fe 2 As 2 O 6 shows metallic conductivity down to ~200 K and turns to show a semiconducting-like conductivity accompanied by a positive magneto-resistance (22% at 70 kOe). Although the carrier density is comparable at 300 K (5.9×10 21 cm -3 ) with that of the other Fe-based superconductors, no superconductivity appears down to 2 K. This is primarily because the net carrier density decreases over 3 orders of magnitude on cooling and additionally a possible magnetic order at ~120 K prevents carriers from pairing. The properties were altered largely by introducing the additional carriers.

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Section: Introductionmentioning

confidence: 99%

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

et al. 2011

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“…Since the discovery of superconductivity in LaFeAs(O 1−x F x ) [1], high transition temperatures (T c ) up to 56 K have been reported in the doped Fe-based oxypnictides [2,3,4,5,6,7,8,9]. The new high-temperature superconductivity in Fe-pnictides has attracted tremendous interests both experimentally and theoretically.…”

Section: Introductionmentioning

confidence: 99%

Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors

Shibauchi

Hashimoto

Okazaki

et al. 2009

Physica C: Superconductivity

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In this article, we review our recent studies of microwave penetration depth, lower critical fields, and quasiparticle conductivity in the superconducting state of Fe-arsenide superconductors. Highsensitivity microwave surface impedance measurements of the in-plane penetration depth λ ab in single crystals of electron-doped PrFeAsO1−y (y ∼ 0.1) and hole-doped Ba1−xKxFe2As2 (x ≈ 0.55) are presented. In clean crystals of Ba1−xKxFe2As2, as well as in PrFeAsO1−y crystals, the penetration depth shows flat temperature dependence at low temperatures, indicating that the superconducting gap opens all over the Fermi surface. The temperature dependence of superfluid density λ 2 ab (0)/λ 2 ab (T ) in both systems is most consistent with the existence of two different gaps. In Ba1−xKxFe2As2, we find that the superfluid density is sensitive to degrees of disorder inherent in the crystals, implying unconventional impurity effect. We also determine the lower critical field Hc1 in PrFeAsO1−y by using an array of micro-Hall probes. The temperature dependence of Hc1 saturates at low temperatures, fully consistent with the superfluid density determined by microwave measurements. The anisotropy of Hc1 has a weak temperature dependence with smaller values than the anisotropy of upper critical fields at low temperatures, which further supports the multi-gap superconductivity in Fe-arsenide systems. The quasiparticle conductivity shows an enhancement in the superconducting state, which suggests the reduction of quasiparticle scattering rate due to the gap formation below Tc. From these results, we discuss the structure of the superconducting gap in these Fe-arsenides, in comparison with the high-Tc cuprate superconductors.

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“…15 Almost five years since the initial discovery, the maximum T c in bulk Fe-SCs remains capped at B57 K for Sm 0. 95 17 while superconductivity up to 65 K has very recently been reported in single layer FeSe films. 18 Unconventional superconductivity is also present in some of the strongly-correlated heavy-fermion materials (HFs).…”

Section: Jennifer E Hoffmanmentioning

confidence: 99%

Interplay of chemical disorder and electronic inhomogeneity in unconventional superconductors

Zeljkovic

Hoffman

2013

Phys. Chem. Chem. Phys.

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Many of today's forefront materials, such as high-T c superconductors, doped semiconductors, and colossal magnetoresistance materials, are structurally, chemically and/or electronically inhomogeneous at the nanoscale. Although inhomogeneity can degrade the utility of some materials, defects can also be advantageous. Quite generally, defects can serve as nanoscale probes and facilitate quasiparticle scattering used to extract otherwise inaccessible electronic properties. In superconductors, nonstoichiometric dopants are typically necessary to achieve a high transition temperature, while both structural and chemical defects are used to pin vortices and increase critical current. Scanning tunneling microscopy (STM) has proven to be an ideal technique for studying these processes at the atomic scale.In this perspective, we present an overview of STM studies on chemical disorder in unconventional superconductors, and discuss how dopants, impurities and adatoms may be used to probe, pin or enhance the intrinsic electronic properties of these materials.

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Thorium-doping–induced superconductivity up to 56 K in Gd _1−x Th _x FeAsO

Cited by 643 publications

References 20 publications

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors

Interplay of chemical disorder and electronic inhomogeneity in unconventional superconductors

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Thorium-doping–induced superconductivity up to 56 K in Gd 1−x Th x FeAsO

Cited by 643 publications

References 20 publications

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

Magnetic and electrical properties and carrier doping effects on the iron-based host compound Sr2ScFeAsO3

Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors

Interplay of chemical disorder and electronic inhomogeneity in unconventional superconductors

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Thorium-doping–induced superconductivity up to 56 K in Gd _1−x Th _x FeAsO