Universal scaling behavior of the upper critical field in strained FeSe<sub>0.7</sub>Te<sub>0.3</sub> thin films

Yuan, Feifei; Grinenko, V.; Iida, K.; Richter, Stefan; Pukenas, Aurimas; Skrotzki, Werner; Sakoda, Masahito; Naito, Makio; Sala, Alberto; Putti, M.; Yamashita, Aichi; Takano, Yoshihiko; Shi, Zhixiang; Nielsch, Kornelius; Hühne, Ruben

doi:10.1088/1367-2630/aade66

Cited by 14 publications

(15 citation statements)

References 57 publications

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“…The upper critical fields at 0 K (H C2 (0)) for all the superconducting samples have been estimated using the Ginzburg-Landau (GL) theory. The GL theory provides the analysis of the H C2 (0) values near T C [32]. The H C2 (T) versus T/T 90 plot for the calculation of H C2 (0) have been shown in the figure 7(a).…”

Section: Resultsmentioning

confidence: 99%

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Study of TAFF and vortex phase of Fe_xTe_0.60Se_0.40 (0.970 ≤ x ≤ 1.030) single crystals

Kumar¹,

Varma²

2020

Phys. Scr.

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Single crystalline samples with starting compositions FexTe0.60Se0.40 (x = 0.970, 0.985, 1, 1.015 and 1.030) have been grown using the self-flux method to study the effect of Fe variation (x) on the structural and superconducting properties of the grown single crystalline samples. All the grown samples are found superconducting and among all, the FeTe0.60Se0.40 (x = 1) sample shows the highest superconducting transition temperature (TC). For the samples with x other than 1, a decrease in the superconducting properties, such as TC, activation energy (U0) and upper critical field (HC2(0)), has been observed. The thermal activation energy (TAE) of the flux flow has been calculated using the conventional method and modified thermally activated flux flow (TAFF) model. The values of U0(H) show transition from the single vortex pinning regime to the collective vortex pinning regime at 2T. Also, the presence of planer defects has been estimated via both models. Furthermore, the modified TAFF model suggests three dimentional (3D) behaviour for all the grown single crystals. The vortex phase diagrams have been established by analysing the magnetoresistance data. The analysis reveals the transitions from unpinned to pinned vortex liquid region and also from the pinned vortex liquid state to vortex glass state. In the vortex phase diagram, below the critical temperature (T*), the critical exponent (s) is in a good agreement with the ‘q’ values for the 3D behaviour of vortex states for all the grown samples.

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Section: Resultsmentioning

confidence: 99%

“…The H C2 (T) versus T/T 90 plot for the calculation of H C2 (0) have been shown in the figure 7(a). The GL equation (equation ( 1)) is given below [32,33].…”

Section: Resultsmentioning

confidence: 99%

Study of TAFF and vortex phase of Fe_xTe_0.60Se_0.40 (0.970 ≤ x ≤ 1.030) single crystals

Kumar¹,

Varma²

2020

Phys. Scr.

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“…As shown in Figure , the B (T) versus T (K) plots are in a small temperature range close to transition temperatures. The Ginzburg–Landau (GL) theory provides an analysis of the upper critical field values near the transition temperature . Therefore, in this work the B C2 (0) values are obtained by fitting the B C2 (T) versus T / T 90 (see inset of Figure ) curves with the GL equation (Equation )

B_{C 2} (T) = B_{C 2} (0) (\frac{1 - t^{2}}{1 + t^{2}})

where t = T / T C is the reduced temperature.…”

Section: Resultsmentioning

confidence: 99%

Study of Structural and Magnetotransport Properties of Fe(Te, Se) Single Crystals

Kumar

Varma

2019

Physica Status Solidi (b)

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Single‐crystalline samples of nominal compositions FeTe0.88 and FeTe1−xSex are synthesized using the self‐flux method. The activation energy of the flux flow is estimated using the Arrhenius relation as well as by the modified thermally activated flux flow (TAFF) model. The field dependence of U0 shows transition from single to collective vortex pinning at a magnetic field of ≈2 T. The analysis of field‐dependent U0 data reveals the planar and the point defect magnetic field regions for both the models. The modified TAFF model is used to study the 2D and 3D behavior of the vortex state for all the superconducting samples. The single‐crystalline FeTe0.80Se0.20 and FeTe0.60Se0.40 samples show 3D behavior, whereas the FeTe0.40Se0.60 crystal shows 2D behavior. The vortex phase diagrams of all the superconducting samples are obtained by analyzing the magnetotransport data. The vortex phase diagrams reveal transitions from the unpinned to pinned vortex liquid state and the vortex liquid to vortex glass state. Below T*, the critical exponent s is in good agreement with q values for 2D/3D behavior of vortex states of all the superconducting samples.

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“…The resultant films showed a Se content of around 0.7 because of the preference of Fe to bond with Se. Also Yuan et al found the resultant films showed a Se content of around 0.7 even though the PLD target with FeSe 0.5 Te 0.5 was employed [134].…”

Section: Pulsed Laser Deposition (Pld)mentioning

confidence: 99%

Fe-based superconducting thin films—preparation and tuning of superconducting properties

Hänisch¹,

Iida²,

Hühne³

et al. 2019

Supercond. Sci. Technol.

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Thin films of Fe-based superconductors (FBS) have been utilized in a plethora of different experiments for a fundamental understanding of the superconductivity in these materials, as well as for understanding and improving the materials with regard to possible applications. The developments and progress in thin film growth of these materials in the past 10 years are reviewed with a focus on the two main deposition techniques used so far for FBS (pulsed laser deposition, and molecular beam epitaxy). Possible choices of substrates or buffer systems are motivated and explained with regard to misfit, thermal expansion, chemical stability, etc. In the second part of this review, investigations on tuning the superconducting properties, especially critical temperature Tc and critical current density Jc, in FBS thin films are reviewed.

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Universal scaling behavior of the upper critical field in strained FeSe_0.7Te_0.3 thin films

Cited by 14 publications

References 57 publications

Study of TAFF and vortex phase of Fe_xTe_0.60Se_0.40 (0.970 ≤ x ≤ 1.030) single crystals

Study of TAFF and vortex phase of Fe_xTe_0.60Se_0.40 (0.970 ≤ x ≤ 1.030) single crystals

Study of Structural and Magnetotransport Properties of Fe(Te, Se) Single Crystals

Fe-based superconducting thin films—preparation and tuning of superconducting properties

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Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films

Cited by 14 publications

References 57 publications

Study of TAFF and vortex phase of FexTe0.60Se0.40 (0.970 ≤ x ≤ 1.030) single crystals

Study of TAFF and vortex phase of FexTe0.60Se0.40 (0.970 ≤ x ≤ 1.030) single crystals

Study of Structural and Magnetotransport Properties of Fe(Te, Se) Single Crystals

Fe-based superconducting thin films—preparation and tuning of superconducting properties

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Product

Resources

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Universal scaling behavior of the upper critical field in strained FeSe_0.7Te_0.3 thin films

Study of TAFF and vortex phase of Fe_xTe_0.60Se_0.40 (0.970 ≤ x ≤ 1.030) single crystals

Study of TAFF and vortex phase of Fe_xTe_0.60Se_0.40 (0.970 ≤ x ≤ 1.030) single crystals