Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped

Katase, Takayoshi; Hiramatsu, Hidenori; Yanagi, Hiroshi; Kamiya, Toshio; Hirano, Masahiro; Hosono, Hideo

doi:10.1016/j.ssc.2009.10.001

Cited by 70 publications

(82 citation statements)

References 30 publications

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“…[18][19][20][21][22] In this article we focus on Ba(Fe 1−x Co x ) 2 As 2 . Thermal conductivity measurements, performed at temperatures down to 50 mK, indicate a nodeless in-plane gap in this compound.…”

Section: -16mentioning

confidence: 99%

Highly anisotropic energy gap in superconductingBa(Fe0.9Co0.1)2

et al. 2010

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We have measured the complex dynamical conductivity, σ = σ1 + iσ2, of superconducting Ba(Fe0.9Co0.1)2As2 (Tc = 22 K) at terahertz frequencies and temperatures 2 -30 K. In the frequency dependence of σ1 below Tc, we observe clear signatures of the superconducting energy gap opening. The temperature dependence of σ1 demonstrates a pronounced coherence peak at frequencies below 15 cm −1 (1.8 meV). The temperature dependence of the penetration depth, calculated from σ2, shows power-law behavior at the lowest temperatures. Analysis of the conductivity data with a two-gap model, gives the smaller isotropic s-wave gap of ∆A = 3 meV, while the larger gap is highly anisotropic with possible nodes and its rms amplitude is ∆0 = 8 meV. Overall, our results are consistent with a two-band superconductor with an s± gap symmetry.

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Section: -16mentioning

confidence: 99%

Highly anisotropic energy gap in superconductingBa(Fe0.9Co0.1)2

et al. 2010

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“…Indeed, the anisotropic superconducting properties are the big drawback of cuprate superconductors in terms of technical applicability. Iron based superconductors do not suffer from such anisotropies, and even though their critical temperatures are still lower, the development of films 10,11 or wires 12 with these new materials is going ahead. Magnetism is not only presumed to play an important role in the pairing mechanism.…”

Section: Introductionmentioning

confidence: 99%

Structure–property relationships of iron arsenide superconductors

Johrendt

2011

J. Mater. Chem.

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Iron based superconductors sent material scientists into a renewed excitement reminiscent of the time when the first high-T c superconductors were discovered 25 years ago. This feature article reviews relationships between structural chemistry and magnetic as well as superconducting properties of iron arsenide compounds, which are outstandingly rich and uniquely coupled. Particular attention is paid to the nature of the structural phase transitions of the parent compounds and their possible origins, on effects of doping on the crystal structures and on the coexistence of magnetic ordering and superconductivity. In spite of the many fascinating insights that have already enriched the research on superconductivity, many questions are still open and prove iron based superconductors to be a good recipe for future discoveries in this lively field.

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“…Intense peaks of BaFe 2 As 2 :Co 00l and LSAT 00l diffractions were observed, but peaks due to a metal Fe impurity, which should appear at 2θ ~44 and 65 degrees, 10 were almost removed. Figure 1(b) shows the temperature dependence of the resistivity for the epitaxial film on a STO bicrystal substrate.…”

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confidence: 99%

Josephson junction in cobalt-doped BaFe2As2 epitaxial thin films on (La,Sr)(Al,Ta)O3 bicrystal substrates

Katase

Ishimaru

Tsukamoto

et al. 2010

Applied Physics Letters

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Josephson junctions were fabricated in epitaxial films of cobalt-doped BaFe 2 As 2 on [001]-tilt (La,Sr)(Al,Ta)O 3 bicrystal substrates. 10-µm-wide microbridges spanning a 30-degrees-tilted bicrystal grain boundary (BGB bridge) exhibited resistively-shunted-junction (RSJ)-like current-voltage characteristics up to 17 K, and the critical current was suppressed remarkably by a magnetic field. Microbridges without a BGB did not show the RSJ-like behavior, and their critical current densities were 20 times larger than those of BGB bridges, confirming BGB bridges display a Josephson effect originating from weakly-linked BGB.

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Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped

Cited by 70 publications

References 30 publications

Highly anisotropic energy gap in superconductingBa(Fe0.9Co0.1)2

Highly anisotropic energy gap in superconductingBa(Fe0.9Co0.1)2

Structure–property relationships of iron arsenide superconductors

Josephson junction in cobalt-doped BaFe2As2 epitaxial thin films on (La,Sr)(Al,Ta)O3 bicrystal substrates

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