Enhanced physical properties of single crystal Fe0.99Te0.63Se0.37 prepared by self-flux synthesis method

Onar, K.; Özçelık, Bekir; Güler, Nilay Kantarcı; Okazaki, Hiroyuki; Takeya, Hiroyuki; Takano, Yoshihiko; Yakıncı, M. E.

doi:10.1016/j.jallcom.2016.05.086

Cited by 14 publications

(10 citation statements)

References 47 publications

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“…The TAE of the flux flow was obtained using the conventional and modified TAFF models. From the conventional method, the activation energy was calculated using the Arrhenius relation (Equation )

ρ = ρ_{0} \exp (- U_{0} / T)

where U 0 and ρ 0 are the activation energy and the normal state resistivity, respectively. To obtain the activation energy, ln ρ versus 1/ T curves for different magnetic fields were plotted and with the slope of the linear part of each curve the value of U 0 was obtained for different applied magnetic fields.…”

Section: Resultssupporting

confidence: 63%

“…The calculated values of B C2 (0) of the samples x = 0.20, x = 0.40, and x = 0.60 for the criteria of 90%, 50%, and 10% of normal state resistivity are given in Table . The obtained values of B C2 (0) are comparable to the previously reported values of B C2 (0) of FeTe 1− x Se x single‐crystalline samples . In the current work, the observed values of the upper critical field B C2 (0) are highest for the x = 0.60 sample.…”

Section: Resultsmentioning

confidence: 99%

“…In the current work, the observed values of the upper critical field B C2 (0) are highest for the x = 0.60 sample. From the observed values of B C2 (0) the values of the coherence length at the zero temperature ( ξ 0 ) were calculated using the GL coherence length relation: B C2 (0) = ϕ 0 /(2 πξ 2 (0)), where ϕ 0 is the flux quantum, the value of which is 2.067 × 10 −15 T m 2 . The calculated values of ξ 0 are given in Table .…”

Section: Resultsmentioning

confidence: 99%

“…From Figure , we see the change in the values of α with the application of magnetic fields. A similar behavior of α for the field‐dependent activation energy has been reported for single crystals of Fe 1.06 Te 0.6 Se 0.4 , Fe 0.99 Te 0.63 Se 0.37 , SmFeAsO 0.85 , and the thin film of FeSe 0.60 Te 0.40 . From Figure , we see that U 0 has weak magnetic field dependence for B ≤ 2 T and strong magnetic field dependence for B ≥ 3 T. For U 0 ( B ), calculated from the conventional method, the obtained values of α for all the superconducting samples are shown in Figure a, and are in the range 0.05–0.11 for B ≤ 2 T and 0.25–0.29 for B ≥ 3 T. The observed values of α in the two magnetic field ranges indicate crossover of the pinning behavior from single vortex pinning to collective vortex pinning.…”

Section: Resultsmentioning

confidence: 99%

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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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ρ = ρ_{0} \exp (- U_{0} / T)

Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

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

Kumar

Varma

2019

Physica Status Solidi (b)

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“…Eğim, %1 In, %3 In ve %5 In katkılı örnekler için sırasıyla -4.89 T/K, -4.2 T/K ve -3.49 T/K olarak bulunmuştur. Buna göre, Hc2(0) değerleri %1 In katkılı örnek literatürdeki tek kristal formda üretilen FeTe0.5Se0.5 sistemine yakın iken (60-103 T arasında) %3 ve %5 In katkılı örneklerin Hc2(T) değerleri düşmektedir [24,25].…”

Section: Elektriksel İletim öZellikleriunclassified

Tek Kristal Formdaki FeTe0.5Se0.5 Süperiletken Sistemine In (% 5’ e kadar) Katkısının Yapısal ve Elektriksel İletim Özelliklerine Etkisi

Yakinci

2021

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Bu çalışmada, Self-flux metodu ile tek kristal formda üretilen ve %5' e kadar In katkılanmış FeTe0.5Se0.5 sisteminin (FeTe0.5Se0.5+%1, FeTe0.5Se0.5+%3, FeTe0.5Se0.5+%5) yapısal ve elektriksel iletim özelliklerini incelenmiştir. FeTe0.5Se0.5 sistemi içerisinde oldukça düşük erime sıcaklığına sahip olan İndiyum'un kristal oluşumunda bir akı görevi gördüğü ve aynı zamanda yapıda homojen bir dağılım sergilediği bulunmuştur. Ancak In katkılama oranı arttıkça FeTe0.5Se0.5 sisteminin süperiletkenlik özelliklerinin olumsuz yönde değiştiği görülmüştür. Katkılama oranlarına göre en iyi değerin, Tc başlangıç ve Tc sıfır değerleri, %1 In katkılı örnekte 16.07 K ve 14.80 K olarak bulunmuştur. Daha yüksek In katkı oranları için ise her iki değerinde azalma eğilimine girdiği bulunmuştur. Werthamer-Halfand-Hohenberg (WHH) eşitliği ile manyetodirenç eğrilerinden üst kritik alan değerleri hesaplanmış ve en iyi değerin %1 In katkısı için olduğu bulunmuş, yüksek katkılama oranları için de değerin azaldığı gözlenmiştir. Arrhenius eşitliği ile belirlenen, vorteks oluşum ve hareketlilik aktivasyon enerjisi 0 Teslada %1, %3 ve %5 In katkılı örnekler için 1822, 515, 457eV' olduğu bulunmuştur. Elde edilen sonuçlar, FeTe0.5Se0.5 sistemine In katkısının artan oranlarının süperiletkenlik mekanizmasını olumsuz yönde etkilediğini göstermiştir.

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Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

Miglani,

Chauhan,

Varma

2023

Physica Status Solidi (a)

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A comprehensive study of magnetotransport and field‐dependent specific heat of FeTe0.58Se0.42 single crystals synthesized using the self‐flux method is reported. The transport measurement reveals the presence of Fermi liquid behavior in the normal state resistivity of the single crystals. Furthermore, the grown single crystals exhibit anisotropy and demonstrate a high value of upper critical magnetic field (HC2). The magnetoresistance exhibits a linear behavior as the magnetic field increases, suggesting the possible presence of a Dirac‐cone state. Anisotropy is also observed in magnetoresistance near the superconducting transition temperature (TC). The sign reversal of the Hall coefficient and the violation of Kohler's rules are observed, which provide evidence of the presence of multiband effects in FeTe0.58Se0.42 single crystals. Specific heat measurements confirm the bulk superconductivity in the grown single crystals. Additionally, the specific heat jump is estimated, which is approximately equal to . The magnetic field‐dependent specific heat also suggests multiband superconductivity and offers insights into the upper critical field. Furthermore, the electronic specific heat is best fitted with a two‐band model. Moreover, the field‐dependent residual Sommerfeld coefficient gives information about the superconducting pairing symmetry.

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Enhanced physical properties of single crystal Fe0.99Te0.63Se0.37 prepared by self-flux synthesis method

Cited by 14 publications

References 47 publications

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

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

Tek Kristal Formdaki FeTe0.5Se0.5 Süperiletken Sistemine In (% 5’ e kadar) Katkısının Yapısal ve Elektriksel İletim Özelliklerine Etkisi

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method

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Enhanced physical properties of single crystal Fe0.99Te0.63Se0.37 prepared by self-flux synthesis method

Cited by 14 publications

References 47 publications

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

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

Tek Kristal Formdaki FeTe0.5Se0.5 Süperiletken Sistemine In (% 5’ e kadar) Katkısının Yapısal ve Elektriksel İletim Özelliklerine Etkisi

Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe0.58Se0.42 Single Crystals Grown by Self‐Flux Method

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Product

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Investigation on Magnetotransport Properties and Specific Heat Capacity of FeTe_0.58Se_0.42 Single Crystals Grown by Self‐Flux Method