Magnetic anomaly in superconducting FeSe

Mendoza, D.; Benítez, J.L.; Morales, F.; Escudero, R.

doi:10.1016/j.ssc.2010.03.025

Cited by 16 publications

(12 citation statements)

References 35 publications

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“…1 K higher than the T c onset of polycrystalline β‐Fe x Se samples. No magnetic discontinuity is observed between T c and 300 K. Thus, anomalies reported between 70 and 120 K2,32–34 are likely due to the presence of impurity phases such as Fe 7 Se 8 , Fe, or iron oxide.…”

Section: Resultsmentioning

confidence: 86%

Synthesis and Crystal Growth of Tetragonal β‐Fe_1.00Se

Koz

Schmidt

Borrmann

et al. 2014

Zeitschrift anorg allge chemie

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Section: Resultsmentioning

confidence: 86%

Synthesis and Crystal Growth of Tetragonal β‐Fe_1.00Se

Koz

Schmidt

Borrmann

et al. 2014

Zeitschrift anorg allge chemie

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“…Additionally, in FeSe poly crystals and single crystals with relatively small RRR values, it has been known that there is no clear kink in the ρ – T curves. Instead, a peak is observed in the differential resistivity 18 19 . This peak appears at approximately 90 K 18 19 , which is also found to be due to the structural transition.…”

Section: Resultsmentioning

confidence: 98%

“…The highest T c of the films on LAO substrates reaches 19 K, which is also higher than that of bulk samples. The dip- or peak- behaviors, which are well-known to be originated from the structural transition in FeSe bulk samples141516171819, are observed in the temperature dependences of differential resistivity for those films with 0 ≤ x ≤ 0.3. More importantly, in the doping-temperature ( x – T ) phase diagram of FeSe 1− x Te x thin films on LaAlO 3 , we observe a systematic decrease of its anomaly temperature in the resistivity data with increasing x and a sudden increase in T c at x = 0.4 where the dip- or peak- anomaly disappears.…”

mentioning

confidence: 95%

Control of structural transition in FeSe1−xTex thin films by changing substrate materials

Imai

Sawada

Nabeshima

et al. 2017

Sci Rep

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Iron chalcogenide superconductors FeSe1−xTex are important materials for investigating the relation be-tween the superconductivity and the orbital and/or electronic nematic order, because the end member material FeSe exhibits a structural transition without a magnetic phase transition. However, the phase separation occurs in the region of 0.1 ≤ x ≤ 0.4 for bulk samples, and it prevents the complete understanding of this system. Here, we report the successful fabrication of epitaxial thin films of FeSe1−xTex with 0 ≤ x ≤ 0.7, which includes the phase-separation region, on LaAlO3 substrates via pulsed laser deposition. In the temperature dependences of differential resistivity for these films with 0 ≤ x ≤ 0.3, the dip- or peak- anomalies, which are well-known to be originated from the structural transition in FeSebulk samples, are observed at the characteristic temperatures, T*. The doping-temperature (x–T) phase diagram of FeSe1−xTex films clearly shows that T* decreases with increasing x, and that Tc suddenly changes at a certain Te content where T* disappears, which turns out to be commonly observed for both films on LaAlO3 and CaF2. These indicate the importance of controlling the structural transition to achieve high Tc in iron chalcogenides.

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“…This behavior is possibly due to presence of Fe 7 Se 8 impurity phase in the samples which has been detected by the XRD result. 15,39,43,44 This transition may also be due to presence of small amount of Fe 3 O 4 phase in the sample which could not be detected in the XRD results. 7 To study the field dependent critical current density, J C (H), the field dependent magnetization measurements (M-H) of samples FTS0.40 and FTS0.50 samples have been done at 5 K temperature by applying the magnetic field along the c-axis in the range 0 to ±7 T (see Fig.…”

Section: Resultsmentioning

confidence: 91%

Superconducting, magnetic and magnetotransport properties of FeTe1-xSex single crystals

2018

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The single crystalline samples with compositions FeTe1-xSex (0.25 ≤ x ≤ 0.50) have been prepared via self-flux method and the superconducting, magnetic and magnetotransport properties of the grown crystals were investigated. The superconducting onset temperatures have been determined from the measurements of zero field cooled magnetization and resistance with temperatures. In the present case, highest superconducting transition temperature TC (onset) ∼ 15 K has been obtained for x=0.5. The HC2 (T=0 K) values have been estimated by fitting the experimental HC2 - T plots with WHH model. The highest HC2(0) has been obtained for x=0.5. The activation energy of the thermally activated flux flow has been found from the broadening of superconducting transition in an applied magnetic field using the Arrhenius law. Our results show that the activation energy (U0) decreases with the increasing magnetic field. Furthermore, the magnetization measurements for x=0.4 and 0.5 samples have been performed at T=5 K in the magnetic field range ±7 T to estimate critical current density at different applied magnetic fields using Bean formula. We see that the sample x=0.5 has higher values of JC as compared to that of x=0.4 at all magnetic fields. This is in conformity with the behavior of U0–H plots.

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Magnetic anomaly in superconducting FeSe

Cited by 16 publications

References 35 publications

Synthesis and Crystal Growth of Tetragonal β‐Fe_1.00Se

Synthesis and Crystal Growth of Tetragonal β‐Fe_1.00Se

Control of structural transition in FeSe1−xTex thin films by changing substrate materials

Superconducting, magnetic and magnetotransport properties of FeTe1-xSex single crystals

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Magnetic anomaly in superconducting FeSe

Cited by 16 publications

References 35 publications

Synthesis and Crystal Growth of Tetragonal β‐Fe1.00Se

Synthesis and Crystal Growth of Tetragonal β‐Fe1.00Se

Control of structural transition in FeSe1−xTex thin films by changing substrate materials

Superconducting, magnetic and magnetotransport properties of FeTe1-xSex single crystals

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Product

Resources

About

Synthesis and Crystal Growth of Tetragonal β‐Fe_1.00Se

Synthesis and Crystal Growth of Tetragonal β‐Fe_1.00Se