Evidence for a reentrant superconducting state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>EuFe</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>As</mml:mtext></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>under pressure

Miclea, C.; Nicklas, M.; Jeevan, H. S.; Kasinathan, Deepa; Hossain, Zakir; Rösner, H.; Gegenwart, P.; Geibel, C.; Steglich, F.

doi:10.1103/physrevb.79.212509

Cited by 183 publications

(191 citation statements)

References 31 publications

(21 reference statements)

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“…Very recently, Jeevan et al discovered hightemperature superconductivity in EuFe 2 As 2 [18] and now, we report the superconductivity of Eu 0.7 Na 0.3 Fe 2 As 2 . It clearly demonstrates that EuFe 2 As 2 is a new member of the ThCr 2 Si 2 -type Fe-As superconductor family [22], and offers the opportunity to study the mechanism of new iron-based superconductors.…”

Section: Resultsmentioning

confidence: 99%

Superconductivity at 34.7 K in the iron arsenide Eu_0.7Na_0.3Fe₂As₂

Gao

Wang

et al. 2008

New J. Phys.

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EuFe 2 As 2 is a member of the ternary iron arsenide family. Similar to BaFe 2 As 2 and SrFe 2 As 2 , EuFe 2 As 2 exhibits a clear anomaly in resistivity near 200 K. Here we report the discovery of superconductivity in Eu 0.7 Na 0.3 Fe 2 As 2 by partial substitution of the europium site with sodium. ThCr 2 Si 2 tetragonal structure, as expected for EuFe 2 As 2 , is formed as the main phase for the composition Eu 0.7 Na 0.3 Fe 2 As 2 .Resistivity measurement reveals that the transition temperature T c as high as 34.7 K is observed in this compound. The rate of T c suppression with the applied magnetic field is 3.87 T / K, giving an extrapolated zero-temperature upper critical field of 90 T. It demonstrates a very encouraging application of the new superconductors.

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Section: Resultsmentioning

confidence: 99%

Superconductivity at 34.7 K in the iron arsenide Eu_0.7Na_0.3Fe₂As₂

Gao

Wang

et al. 2008

New J. Phys.

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“…It was also found that under pressure the 122 parents themselves become superconducting [7][8][9] . This led to the finding that even substitutions of isovalent elements, for example, P 10 for As or Ru 11 , Ir 12 , Pd 13 or Rh 13 for Fe, induce superconductivity.…”

Section: Introductionmentioning

confidence: 99%

Heat capacity study ofBaFe2As2: Effects of annealing

et al. 2010

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Heat-capacity, X-ray diffraction, and resistivity measurements on a high-quality BaFe2As2 sample show an evolution of the magneto-structural transition with successive annealing periods. After a 30-day anneal the resistivity in the (ab) plane decreases by more than an order of magnitude, to 12 µΩcm, with a residual resistance ratio ∼36; the heat-capacity anomaly at the transition sharpens, to an overall width of less than K, and shifts from 135.4 to 140.2 K. The heat-capacity anomaly in both the as-grown sample and after the 30-day anneal shows a hysteresis of ∼0.15 K, and is unchanged in a magnetic field µ0H = 14 T. The X-ray and heat-capacity data combined suggest that there is a first order jump in the structural order parameter. The entropy of the transition is reported.

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“…56 The SC state can be achieved either under pressure 57,58 or by appropriate charge carrier doping 59 of the parent compounds, leading to a suppression of the SDW state. Our first task was to check whether magnetism is present in the samples.…”

Section: A Magnetization and Specific Heat Capacity Experimentsmentioning

confidence: 99%

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

et al. 2016

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Probing the pairing symmetry in the over-doped Fe- We report muon spin rotation experiments on the magnetic penetration depth λ and the temperature dependence of λ −2 in the over-doped Fe-based high-temperature superconductor (Fe-HTS) Ba1−xRbxFe2As2 (x = 0.65) studied at ambient and under hydrostatic pressures up to p = 2.3 GPa. We find that in this system λ −2 (T ) is best described by d-wave scenario. This is in contrast to the case of the optimally doped x = 0.35 system which is known to be a nodeless s +− -wave superconductor. This suggests that the doping induces the change of the pairing symmetry from s +− to d-wave in Ba1−xRbxFe2As2. In addition, we find that the d-wave order parameter is robust against pressure, suggesting that d is the common and dominant pairing symmetry in over-doped Ba1−xRbxFe2As2. Application of pressure of p = 2.3 GPa causes a decrease of λ(0) by less than 5 %, while at optimal doping x = 0.35 a significant decrease of λ(0) was reported. The superconducting transition temperature Tc as well as the gap to Tc ratio 2∆/kBTc show only a modest decrease with pressure. By combining the present data with those previously obtained for optimally doped system x = 0.35 and for the end member x = 1 we conclude that the SC gap symmetry as well as the pressure effects on the SC quantities strongly depend on the Rb doping level. These results are discussed in the light of the putative Lifshitz transition, i.e., a disappearance of the electron pockets in the Fermi surface of Ba1−xRbxFe2As2 upon hole doping.

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Evidence for a reentrant superconducting state inEuFe2As2under pressure

Cited by 183 publications

References 31 publications

Superconductivity at 34.7 K in the iron arsenide Eu_0.7Na_0.3Fe₂As₂

Superconductivity at 34.7 K in the iron arsenide Eu_0.7Na_0.3Fe₂As₂

Heat capacity study ofBaFe2As2: Effects of annealing

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

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Evidence for a reentrant superconducting state inEuFe2As2under pressure

Cited by 183 publications

References 31 publications

Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2

Superconductivity at 34.7 K in the iron arsenide Eu0.7Na0.3Fe2As2

Heat capacity study ofBaFe2As2: Effects of annealing

Probing the pairing symmetry in the over-doped Fe-based superconductorBa0.35Rb0.65Fe2As2as a function of hydrostatic pressure

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Superconductivity at 34.7 K in the iron arsenide Eu_0.7Na_0.3Fe₂As₂

Superconductivity at 34.7 K in the iron arsenide Eu_0.7Na_0.3Fe₂As₂