Flux pinning and relaxation in FeSe<sub>0.5</sub>Te<sub>0.5</sub>single crystals

Wu, Zhaofeng; Wang, Z H; Tao, Jian; Qiu, Li; Yang, Shaoguang; Wen, Hao

doi:10.1088/0953-2048/29/3/035006

Cited by 33 publications

(23 citation statements)

References 31 publications

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“…The powder XRD pattern of single crystal, four narrow and sharp peaks appear at about 2θ≈14.83 o , 29.41 o , 44.47 o , 60.50 o , which correspond to the reflected intensity from the (001), (002), (003), (004) planes of the tetragonal crystal structure with space group of P4/nmm. This result is in good agreement with earlier reports [11]. In addition to this, there exists some impurities at about 2θ ≈ 21.66 o , 24.02 o , 26.92 o , whose peaks are very weak.…”

Section: X-ray Characterizationsupporting

confidence: 93%

“…Among the Fe-based superconductors, FeSe-11 so-called chalcogenides have drawn much attention because of their simplest structure and less toxicity compared to the As-based compounds. Morever, tetragonal FeSe which was reported with critical temperature Tc of 8K at ambient pressure, with the substitution of Te with Se, up to 14K in FeTe 1-x Se x compound [11] and up to 37K at hydrostatic pressure [12].…”

Section: Introductionmentioning

confidence: 99%

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Te Katkısının FeSe-11 Bileşiklerine Etkisi, Üretimi ve Karakterizasyonu

Farisoğulları¹,

Güler²,

Karadağ³

et al. 2016

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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In this work, FeTe 0.7 Se 0.3 single crystals have been synthesized by using the self-flux method, in order to understand effect of Te doping in the Fe-chalcogenides. For this purpose, the physical properties of sample have been investigated by Scanning Electron Microscopy (SEM), Energy dispersive x-ray (EDX) spectroscopy, X-ray diffraction (XRD) and magnetic techniques. The XRD results show that the sample has tetragonal structure, with some impurity peaks. SEM results demonstrate that the sample is distributed in a terrace-like formation. EDX results indicate that the distribution of Fe, Te and Se on the surface of the sample is homogenous. According to χ -1 -T measurement, antiferromagnetic interaction is observed. In addition, M-H curves show nearly paramagnetic behavior for the sample measured.

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Section: X-ray Characterizationsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Te Katkısının FeSe-11 Bileşiklerine Etkisi, Üretimi ve Karakterizasyonu

Farisoğulları¹,

Güler²,

Karadağ³

et al. 2016

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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“…Generally, from the application point of view, SCs with high T c , high J c , and high H c2 are preferred; however, it is still a huge obstacle to enhancing the J c along with vortex pinning and other superconducting properties. Evidently, the J c , H c2 , and flux pinning were enhanced by both chemical and physical pressures on this iron-selenide system. − The ionic radius of Mn is higher than that of Ni and also the Fe 0.99 Ni 0.01 Fe 0.5 Te 0.5 sample to have a negative chemical pressure and the corresponding change in T c . Further, it exhibits d T c /d P = +5 K/GPa up to 3 GPa followed by a decrease of T c and suppression at 10 GPa (quasi-hydrostatic pressure).…”

Section: Introductionsupporting

confidence: 79%

Pressure Dependence of Superconducting Properties, Pinning Mechanism, and Crystal Structure of the Fe_0.99Mn_0.01Se_0.5Te_0.5Superconductor

et al. 2021

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We have investigated the pressure (P) effect on structural (up to 10 GPa), transport [R(T): up to 10 GPa], and magnetic [(M(T): up to 1 GPa)] properties and analyzed the flux pinning mechanism of the Fe0.99Mn0.01Se0.5Te0.5 superconductor. The maximum superconducting transition temperature (T c) of 22 K with the P coefficient of T c dT c/dP = +2.6 K/GPa up to 3 GPa (dT c/dP = −3.6 K/GPa, 3 ≤ P ≥ 9 GPa) was evidenced from R(T) measurements. The high-pressure diffraction and density functional theory (DFT) calculations reveal structural phase transformation from tetragonal to hexagonal at 5.9 GPa, and a remarkable change in the unit cell volume is observed at ∼3 GPa where the T c starts to decrease, which may be due to the reduction of charge carriers, as evidenced by a reduction in the density of states (DOS) close to the Fermi level. At higher pressures of 7.7 GPa ≤ P ≥ 10.2 GPa, a mixed phase (tetragonal + hexagonal phase) is observed, and the T c completely vanishes at 9 GPa. A significant enhancement in the critical current density (J C) is observed due to the increase of pinning centers induced by external pressure. The field dependence of the critical current density under pressure shows a crossover from the δl pinning mechanism (at 0 GPa) to the δT c pinning mechanism (at 1.2 GPa). The field dependence of the pinning force at ambient condition and under pressure reveals the dense point pinning mechanism of Fe0.99Mn0.01Se0.5Te0.5. Moreover, both upper critical field (H C2) and J C are enhanced significantly by the application of an external P and change over to a high P phase (hexagonal ∼5.9 GPa) faster than a Fe0.99Ni0.01Se0.5Te0.5 (7.7 GPa) superconductor.

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“…It occurs, when the increase of magnetic field leads to enhanced critical current density (J c ). The effect was observed in FeSe 1−x Te x [10,11], BaFe 2−x Ni x As 2 [12], BaFe 2−x Co x As 2 [13] single crystals, with it, several models were proposed to describe the effect [14]. The vortex glass state was evidenced in the FeSe 1−x Te x [15], (Ba,K)Fe 2 As 2 [16], BaFe 2−x Ni x As 2 [17], and in the oxypnictides SmFeAsO 0.85 [18] crystals.…”

Section: Introductionmentioning

confidence: 91%

Evolution of vortex pinning in the FeSe$_{1-x}$S$_x$ system

Vlasenko,

Sadakov,

Romanova

et al. 2020

Preprint

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We present a comprehensive study of vortex matter and pinning evolution in the FeSe 1−x S x system with various doping degree. The influence of sulphur substitution on vortex pinning and peak effect occurrence is studied. We show that there is a complex interplay among various pinning contributions in the FeSe 1−x S x system. Additionally, we study a possible vortex liquid -vortex glass/lattice transition and find an evidence that the vortex liquid -vortex glass phase transition in FeSe has a quasi two-dimensional nature. We investigate the upper critical field behaviour in FeSe 1−x S x system, and found that the upper critical field is higher than that predicted by the Werthamer-Helfand-Hohenberg (WHH) model, whereas its temperature dependence could be fitted within a two-band framework. Finally, a detailed H-T phase diagram is presented.

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Flux pinning and relaxation in FeSe_0.5Te_0.5single crystals

Cited by 33 publications

References 31 publications

Te Katkısının FeSe-11 Bileşiklerine Etkisi, Üretimi ve Karakterizasyonu

Te Katkısının FeSe-11 Bileşiklerine Etkisi, Üretimi ve Karakterizasyonu

Pressure Dependence of Superconducting Properties, Pinning Mechanism, and Crystal Structure of the Fe_0.99Mn_0.01Se_0.5Te_0.5Superconductor

Evolution of vortex pinning in the FeSe$_{1-x}$S$_x$ system

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Flux pinning and relaxation in FeSe0.5Te0.5single crystals

Cited by 33 publications

References 31 publications

Te Katkısının FeSe-11 Bileşiklerine Etkisi, Üretimi ve Karakterizasyonu

Te Katkısının FeSe-11 Bileşiklerine Etkisi, Üretimi ve Karakterizasyonu

Pressure Dependence of Superconducting Properties, Pinning Mechanism, and Crystal Structure of the Fe0.99Mn0.01Se0.5Te0.5Superconductor

Evolution of vortex pinning in the FeSe$_{1-x}$S$_x$ system

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Product

Resources

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Flux pinning and relaxation in FeSe_0.5Te_0.5single crystals

Pressure Dependence of Superconducting Properties, Pinning Mechanism, and Crystal Structure of the Fe_0.99Mn_0.01Se_0.5Te_0.5Superconductor