Substitution effects of Ag into FeSe0.5Te0.5 superconductor

Migita, M.; Takikawa, Yuichi; Sugai, K.; Takeda, M.; Uehara, M.; Kuramoto, T.; Takano, Yoshihiko; Mizuguchi, Yoshikazu; Kimishima, Y.

doi:10.1016/j.physc.2012.03.002

Cited by 24 publications

(11 citation statements)

References 10 publications

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“…Li, Ag, Co and Ni have been doped into FeSe 0.5 Te 0.5 , the results of which show that most of the dopants suppress the superconductivity except Li [9,10,11]. Especially, the T c in these metal doped FeSe 1−x Te x samples is generally suppressed.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of superconductivity in the sintered FeSe0.5Te0.5 bulks with proper amount of Sn addition

Chen

Liu

et al. 2015

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Enhancement of superconductivity in the sintered FeSe0.5Te0.5 bulks with proper amount of Sn addition

Chen

Liu

et al. 2015

Journal of Alloys and Compounds

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“…In this study we investigate the influence of Ag addition in FeSe on the superconducting properties and intergrain connections. The idea was conceived from our previous investigations concerning cuprates and recent publication [9], which claims that Ag in small concentration (about 5 %) enters into the crystal structure of FeSe 0.5 Te 0.5 , suppressing weakly T c and improving J c in magnetic field.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ag Addition on the Superconducting Properties of FeSe0.94

Nazarova

Buchkov

Terzieva

et al. 2014

J Supercond Nov Magn

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The tetragonal FeSe phase is an intensively investigated iron based superconductor. In this study we examined the influence of Ag addition on the superconducting properties of selenium deficient polycrystalline FeSe 0.94 . The samples were obtained by solid state reaction and melting methods. XRD analysis shows the presence of tetragonal phase and EDX analysis establishes inhomogeneous Ag distribution in the grains. The superconducting properties were investigated by fundamental and third harmonic AC magnetic susceptibility. The intergranular critical current determined from AC magnetic susceptibility in the Ag doped sample is several times higher than that in the undoped one, obtained by melting at approximately the same temperatures. Intragranular current is field independent up to almost 1000 Oe. Using the temperature dependence of third harmonic AC magnetic susceptibility at different DC magnetic fields, the irreversibility lines were obtained for all samples. It is found that Ag addition increased the irreversibility field in comparison with undoped melted and powder sintered samples. All results show that the Ag addition in selenium deficient (FeSe 0.94 ) samples leads to improvement of inter-and intra-granular properties: screening ability, pinning, activation energy and critical current and improves the irreversibility line.

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“…Silver has been widely used as a dopant or additive to improve the microstructure and SC properties [53][54][55]. The role of Ag addition on structure and SC properties was investigated for polycrystalline Sr 0.6 K 0.4 Fe 2 As 2 [56] and FeSe 0.5 Te 0.5 [57],…”

Section: Methodsmentioning

confidence: 99%

Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc

Solovjov,

Petrenko,

Omelchenko

et al. 2020

Preprint

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Temperature dependencies of excess conductivity, σ ′ , have been studied in detail for three FeSe 0.94 textured polycrystalline samples prepared by partial melting and solid state reaction.It was revealed that both σ ′ and its temperature dependence are extremely sensitive to the method of sample preparation. Then, it was shown that in the range from the superconducting transition temperature T c ∼ 9 K up to the characteristic temperature T 01 ∼ 19 K, σ ′ (T ) obeys the classical fluctuation theories of Aslamazov-Larkin (AL) and Hikami-Larkin (Maki-Thompson (MT) term) pointing to the existence of fluctuating Cooper pairs in FeSe at temperatures exceeding double T c . Like in cuprates, AL-MT crossover at T 0 < T 01 is observed, which means the appearance of 3D-2D dimensional transition at this temperature. This allows us to determine the coherence length along the c-axis, ξ c (0) ∼ 3 Å, and a set of additional samples' parameters, including the phase relaxation time, τ φ , of fluctuating Cooper pairs, within a simple two-dimensional free-carrier picture. It was shown that τ φ in FeSe coincides with that found for YBa 2 Cu 3 O 7−δ suggesting that the nature of superconducting fluctuations is very similar for these high-temperature superconductors of different types.

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Substitution effects of Ag into FeSe0.5Te0.5 superconductor

Cited by 24 publications

References 10 publications

Enhancement of superconductivity in the sintered FeSe0.5Te0.5 bulks with proper amount of Sn addition

Enhancement of superconductivity in the sintered FeSe0.5Te0.5 bulks with proper amount of Sn addition

The Effect of Ag Addition on the Superconducting Properties of FeSe0.94

Fluctuating Cooper pairs in FeSe at temperatures exceeding double Tc

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