Effect of proton irradiation on the fluctuation-induced magnetoconductivity of FeSe1−xTexthin films

Ahmad, Dawood; Choi, Woojae; Seo, Y. I.; Seo, Sehun; Lee, Sanghan; Park, Tuson; Mosqueira, J.; Gu, Genda; Kwon, Yong Seung

doi:10.1088/1367-2630/aa76ad

Cited by 12 publications

(8 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, a more extended investigation carried out on heavy-ion irradiated FeSe0.4Te0.6 single crystals yielded to not systematic and not reproducible results on superconducting properties [12], even if a significant effect in terms of vortex-pinning enhancement on FeSe0.45Te0.55 crystals has been proven on the atomic scale [13]. Recently, on the contrary, Fe(Se,Te) thin films grown on CaF2 were reported to show a decrease in Tc up to 7 K upon irradiation with 3.5 MeV protons [14].…”

Section: Introductionmentioning

confidence: 96%

Effects of high-energy proton irradiation on the superconducting properties of Fe(Se,Te) thin films

Sylva¹,

Martinelli²,

Pallecchi³

et al. 2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

In this paper we explore the effects of 3.5 MeV proton irradiation on Fe(Se,Te) thin films grown on CaF2. In particular, we carry out a systematic experimental investigation with different irradiation fluences up to 7.30·10 16 cm -2 and different proton implantation depths, in order to clarify whether and to what extent the critical current is enhanced or suppressed, what are the effects of irradiation on the critical temperature, the resistivity and the critical magnetic fields, and finally what is the role played by the substrate in this context.We find that the effect of irradiation on superconducting properties is generally small as compared to the case of other iron-based superconductors. Such effect is more evident on the critical current density Jc, while it is minor on the transition temperature Tc, on the normal state resistivity  and on the upper critical field Hc2 up to the highest fluences explored in this work. In addition, our analysis shows that when protons implant in the substrate far from the superconducting film, the critical current can be enhanced up to 50% of the pristine value at 7 T and 12 K, while there is no appreciable effect on critical temperature and critical fields together with a slight decrease in resistivity. On the contrary, when the implantation layer is closer to the film-substrate interface, both critical current and temperature show a decrease accompanied by an enhancement of the resistivity and the lattice strain. This result evidences that possible modifications induced by irradiation in the substrate may affect the superconducting properties of the film via lattice strain. The robustness of the Fe(Se,Te) system to irradiation induced damage makes it a promising compound for the fabrication of magnets in high-energy accelerators.

show abstract

Section: Introductionmentioning

confidence: 96%

Effects of high-energy proton irradiation on the superconducting properties of Fe(Se,Te) thin films

Sylva¹,

Martinelli²,

Pallecchi³

et al. 2018

Supercond. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…This background resistivity was determined by a linear fit to the resistivity above 35 K (i.e., above 1.5T c ) where fluctuation effects are expected to be negligible. [27][28][29][30][31] Some examples of this procedure for different field amplitudes and orientations are presented in Figs. 2a-c.…”

Section: Determination Of the Normal State Backgroundmentioning

confidence: 99%

“…Thus, in what follows we have set c = 0.3, a value that is close to the one found in other FeSC. [27][28][29][30][31] In the zero-field limit (for h ≪ ε), and in the absence of cutoff (c → ∞), equation (3) reduces to the well known Aslamazov-Larkin expression, ∆σ (ε) = e 2 /32hξ c (0)ε 1/2 .…”

Section: Determination Of the Normal State Backgroundmentioning

confidence: 99%

“…Firstly, due to the relatively high T c and the small value of the coherence length (just a few nm), thermal fluctuation effects near T c (H) play an important role in these materials, 26 and contribute to the rounding of the resistive transition. [27][28][29][30][31] These effects are also strongly dependent on the amplitude and orientation of the applied magnetic field. 32 A second factor is the effect of T c inhomogeneities: These compounds are generally non-stoichiometric, and their T c depends on the doping level.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors

Llovo,

Carballeira,

Sóñora

et al. 2021

Preprint

View full text Add to dashboard Cite

Detailed measurements of the in-plane resistivity were performed in a high-quality Ba(Fe 1−x Co x ) 2 As 2 (x = 0.065) single crystal, in magnetic fields up to 9 T and with different orientations θ relative to the crystal c axis. A significant ρ(T ) H,θ rounding is observed just above the superconducting critical temperature T c due to Cooper pairs created by superconducting fluctuations. These data are analyzed in terms of a generalization of the Aslamazov-Larkin approach, that extends its applicability to high reduced-temperatures and magnetic fields. This method allows us to carry out a criterion-independent determination of the angular dependence of the upper critical field, H c2 (θ ). In spite of the relatively small anisotropy of this compound, it is found that H c2 (θ ) presents a significant deviation from the single-band 3D anisotropic Ginzburg-Landau (3D-aGL) approach, particularly for large θ (typically above ∼ 60 o ). These results are interpreted in terms of the multiband nature of these materials, in contrast with other proposals for similar H c2 (θ ) anomalies. Our results are also consistent with an effective anisotropy factor almost temperature independent near T c , a result that differs from the ones obtained by using a single-band model. c2 18-21 However, an anomalous behavior has been reported in some of these compounds, 22,23 qualitatively similar to the behavior observed in other two-band superconductors, such as MgB 2 . 24,25

show abstract

“…20 The formation of a cascade 16 or point defect 21 by ion irradiation also induces deformation of a lattice with a nanoscale defect. In FST thin films, provided that not only large-scale and excessive amounts of defects can degrade the entire superconducting matrix in FST thin films, 22 but also FST has a short coherence length (~2 nm), 23 the formation of minimal size defects for inducing nanostrain is required to prevent Cooper pair breaking while improving Jc.…”

Section: Introductionmentioning

confidence: 99%

Artificially engineered nanostrain in FeSexTe1-x superconductor thin films for supercurrent enhancement

Seo

Noh

et al. 2020

NPG Asia Mater

Self Cite

View full text Add to dashboard Cite

Although nanoscale deformation, such as nanostrain in iron chalcogenide FST) thin films, has attracted attention owing to the enhancement of general superconducting properties, including critical current density (Jc) and critical transition temperature, its formation has proven to be an extremely challenging and complex process thus far. Herein, we successfully fabricated an epitaxial FST thin film with uniformly distributed nanostrain by injection of a trace amount of CeO2 inside FST matrix using sequential pulsed laser deposition.Using transmission electron microscopy and geometrical phase analysis, we verified that a trace amount of CeO2 injection forms nanoscale fine defects with a nanostrained region, which has a tensile strain (ε ≅0.02) along the c-axis of the FST matrix. The nanostrained FST thin film achieves a remarkable Jc of 3.5 MA/cm 2 for a self-field at 6 K and a highly enhanced Jc under the entire magnetic field with respect to a pristine FST thin film.Technology,

show abstract

Effect of proton irradiation on the fluctuation-induced magnetoconductivity of FeSe_1−xTe_xthin films

Cited by 12 publications

References 42 publications

Effects of high-energy proton irradiation on the superconducting properties of Fe(Se,Te) thin films

Effects of high-energy proton irradiation on the superconducting properties of Fe(Se,Te) thin films

Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors

Artificially engineered nanostrain in FeSexTe1-x superconductor thin films for supercurrent enhancement

Contact Info

Product

Resources

About