Transport and magnetic properties of Co-doped BaFe<sub>2</sub>As<sub>2</sub>epitaxial thin films grown on MgO substrate

Mohan, Shyam; Taen, Toshihiro; Yagyuda, Hidenori; Nakajima, Yasuyuki; Tamegai, T.; Katase, Takayoshi; Hiramatsu, Hidenori; Hosono, Hideo

doi:10.1088/0953-2048/23/10/105016

Cited by 23 publications

(24 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…H c2 is remarkably similar for both films in spite of their very different pinning landscapes, as is also observed in cuprate superconductors where the coherence length is very small. We extracted the superconducting mass anisotropy ( γ Η ) using anisotropic scaling26 and found that the films with and without BZO can be described well with γ H ~1.50, which is slightly smaller than γ H for Ba122:Co and Sr122:Co films at the same temperatures212728. These values are in good agreement with the γ ~1.55 value extracted from the angular dependence of H c2 ( t =0.90) for the Ba122:P film and the Ba122:P+3 mol.%BZO film (see inset of Fig.…”

Section: Resultsmentioning

confidence: 99%

Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

et al. 2013

View full text Add to dashboard Cite

The high upper critical field and low anisotropy of the iron-based superconductor BaFe2As2 make it promising for its use in the construction of superconducting magnets. However, its critical current density in high magnetic fields needs to be improved. Here we demonstrate a simple, one-step and industrially scalable means of achieving just this. We show that introducing controlled amounts of uniformly dispersed BaZrO3 nanoparticles into carrier-doped BaFe2As2 significantly improves its superconducting performance without degrading its structural or superconducting properties. Our BaFe2(As0.66P0.33)2 films also exhibit an increase in both the irreversibility line and critical current density at all magnetic-field orientations. These films exhibit nearly isotropic critical current densities in excess of 1.5 MA cm−2 at 15 K and 1 T—seven times higher than previously reported for BaFe2As2 films. The vortex-pinning force in these films reaches ~59 GN m−3 at 5 K and 3–9 T, substantially higher than that of the conventional Nb3Sn wire.

show abstract

Section: Resultsmentioning

confidence: 99%

Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Panels (a) to (d) are for strongly-coupled bands while (e) to (h) are for effectively decoupled bands. References for the raw J c (sf) data sets are: (a) Ba(Fe,Co) 2 As 2 , [27] (b) Ba(Fe,Zn) 2 As 2 , [28] (c) MgB 2 , [29] (d) MgB 2 , [30] (e) Al, [31] (f) Nb [15] and (g) FeSe 1/2 Te 1/2 . [32] Panel (h) shows data for a two-phase film of nominal composition HgBa 2 CaCu 2 O 6 (Hg1212) with intergrowths of Hg1201.…”

Section: Different Topologiesmentioning

confidence: 99%

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

2017

View full text Add to dashboard Cite

Key questions for any superconductor include: what is its maximum dissipation-free electrical current (its 'critical current') and can this be used to extract fundamental thermodynamic parameters? Present models focus on depinning of magnetic vortices and implicate materials engineering to maximise pinning performance. But recently we showed that the self-field critical current for thin films is a universal property, independent of microstructure, controlled only by the penetration depth. Here we generalise this observation to include thin films, wires or nanowires of singleor multi-band s-wave and d-wave superconductors. Using extended BCS equations we consider dissipation-free self-field transport currents as London-Meissner currents, avoiding the concept of pinning altogether. We find quite generally, for type I or type II superconductors, the current is limited by the relevant critical field divided by the penetration depth. Our fits to 64 available data sets, from zinc nanowires to compressed sulphur hydride with critical temperatures of 0.65 to 203 K, respectively, are excellent. Extracted London penetration depths, superconducting energy gaps and specific heat jumps agree well with reported bulk values. For multiband or multiphase samples we accurately recover individual band contributions and phase fractions.

show abstract

“…Magneto-optical (MO) imaging has proven to be extremely powerful for such purposes. It can visualize the spatial distribution of J c , and is widely used to study the connectivity between grains in IBSs [6,11,12,13,14,15,16]. In this report, we carefully studied the critical current density and its distribution in FeTe 0.5 Se 0.5 thin films by MO imaging for the first time.…”

Section: Introductionmentioning

confidence: 99%

Magneto-optical characterizations of FeTe_0.5Se_0.5thin films with critical current density over 1 MA cm⁻²

Sun

Tsuchiya

Pyon

et al. 2014

Supercond. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Abstract. We performed magneto-optical (MO) measurements on FeTe 0.5 Se 0.5 thin films grown on LaAlO 3 (LAO) and Yttria-stabilized zirconia (YSZ) single-crystalline substrates. These thin films show superconducting transition temperature, T c ∼ 19 K, 4 K higher than the bulk sample. Typical roof-top patterns can be observed in the MO images of thin films grown on LAO and YSZ, from which a large and homogeneous critical current density, J c , over 1 × 10 6 A/cm 2 at 5 K was obtained. Magnetic flux penetration measurement reveals that the current is almost isotropically distributed in the two thin films. Compared with bulk crystals, FeTe 0.5 Se 0.5 thin film demonstrates not only higher T c , but also much larger J c , which is attractive for applications.arXiv:1412.2454v1 [cond-mat.supr-con] 8 Dec 2014Magneto-optical characterizations of FeTe 0.5 Se 0.5 thin films with critical current density over 1 MA/cm 2 2

show abstract

Transport and magnetic properties of Co-doped BaFe₂As₂epitaxial thin films grown on MgO substrate

Cited by 23 publications

References 28 publications

Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Magneto-optical characterizations of FeTe_0.5Se_0.5thin films with critical current density over 1 MA cm⁻²

Contact Info

Product

Resources

About

Transport and magnetic properties of Co-doped BaFe2As2epitaxial thin films grown on MgO substrate

Cited by 23 publications

References 28 publications

Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

Strongly enhanced flux pinning in one-step deposition of BaFe2(As0.66P0.33)2 superconductor films with uniformly dispersed BaZrO3 nanoparticles

Thermodynamic Parameters of Single‐ or Multi‐Band Superconductors Derived from Self‐Field Critical Currents

Magneto-optical characterizations of FeTe0.5Se0.5thin films with critical current density over 1 MA cm−2

Contact Info

Product

Resources

About

Transport and magnetic properties of Co-doped BaFe₂As₂epitaxial thin films grown on MgO substrate

Magneto-optical characterizations of FeTe_0.5Se_0.5thin films with critical current density over 1 MA cm⁻²