Pseudogap in SmFeAsO&lt;inf&gt;0.85&lt;/inf&gt; in comparison with s-wave symmetry theory

Solovjov, A. L.; Svetlov, V. N.; Stepanov, V. B.; Sidorov, S. L.; Tarenkov, V. Yu.; Dyachenko, Alexander

doi:10.1109/msmw.2013.6622173

Cited by 3 publications

(4 citation statements)

References 13 publications

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“…A systematic study of the excess conductivity in a similar compound, namely SmFeAsO 0.85 , has been performed and 2D-3D crossovers have been detected [17]. We note that a fluctuation conductivity investigation under magnetic field has been carried out also on REFeAsO (RE = Nd, Pr, Sm) superconductors, again supporting a 2D-3D crossover of the paraconductivity [18].…”

Section: Introductionmentioning

confidence: 54%

Paraconductivity of the K-doped SrFe₂As₂superconductor

Marra

Nigro

et al. 2012

New J. Phys.

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Paraconductivity of the optimally K-doped SrFe2As2 superconductor is investigated within existing fluctuation mechanisms. The in-plane excess conductivity has been measured in high quality single crystals, with a sharp superconducting transition at Tc=35.5 K and a transition width less than 0.3 K. The data have been also acquired in external magnetic field up to 14 T. We show that the fluctuation conductivity data in zero field and for temperatures close to Tc, can be explained within a three-dimensional Lawrence-Doniach theory, with a negligible Maki-Thompson contribution. In the presence of the magnetic field, it is shown that paraconductivity obeys the three-dimensional Ullah-Dorsey scaling law, above 2 T and for H c. The estimated upper critical field and the coherence length nicely agree with the available experimental data.

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Section: Introductionmentioning

confidence: 54%

Paraconductivity of the K-doped SrFe₂As₂superconductor

Marra

Nigro

et al. 2012

New J. Phys.

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“…7), σ ′−1 ∼ exp(ε) [2,27,80]. This feature turns out to be the basic property of the majority of the HTSCs including FeAs-based superconductors [70]. As a result, in this temperature interval ln(σ ′−1 ) is a linear function of ε with a slope α * =1.06 which determines parameter ε * c0 = 1/α * = 0.94 [80] for the sample Y0 (insert in Fig.…”

Section: B Pseudogap Analysismentioning

confidence: 99%

Hydrostatic-pressure effects on the pseudogap in slightly doped YBa2Cu3O7−δ single crystals

Solovjov

Omelchenko

Вовк

et al. 2016

Physica B: Condensed Matter

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The influence of hydrostatic pressure up to P=1.05 GPa on resistivity, excess conductivity σ ′ (T ) and pseudogap ∆ * (T ) is investigated in slightly doped single crystals of Y Ba2Cu3O 7−δ (Tc(P = 0) ≈49.2 K and δ ≈ 0.5). The critical temperature Tc is found to increase with increasing pressure at a rate dTc/dP = +5.1 KGP a −1 , while ρ(300) K decreases at a rate dlnρ/dP = (−19±0.2)% GP a −1 . Near Tc, independently on pressure, the σ ′ (T ) is well described by the Aslamasov-Larkin and HikamiLarkin fluctuation theories, demonstrating a 3D-2D crossover with increase of temperature. The crossover temperature T0 determines the coherence length along the c-axis ξc(0) ≃ (3.43 ± 0.01)Å at P=0, which is found to decrease with increasing P. At the same time, ∆ * and the BCS ratio 2∆ * /kB Tc both increase with increasing hydrostatic pressure at a rate dln∆ * /dP ≈ 0.36 GP a −1 , implying an increase of the coupling strength with increasing P. At low temperatures below Tpair, the shape of the ∆ * (T ) curve is found to be almost independent on pressure. At high temperatures, the shape of the ∆ * (T ) curve changes noticeably with increasing P, suggesting a strong influence of pressure on the lattice dynamics. This unusual behavior is observed for the first time.

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“…In the framework of our local pair model the PG in YBCO films [24], YPrBCO films [30], FeAs-based superconductor SmF eAsO 0.85 with T c =55 K [20,21] and finally in the slightly doped HoBCO single-crystals [31] was successfully studied. The basic results have been obtained after the resistivity data for the set of four YBCO films with different oxygen concentration were analyzed using Eqs.…”

Section: Resultsmentioning

confidence: 99%

“…This condition is realized just in underdoped cuprates (see Ref. [5] and references therein) and in new FeAs-based superconductors [9,20,21] eventually resulting, in our opinion, in PG appearance. But, strictly speaking, the presence or absence of PG in FeAs-based HTS's still remains controversial [9,22].…”

Section: Introductionmentioning

confidence: 81%

Pseudogap and local pairs in high-Tc cuprate superconductors

Solovjov¹,

Tkachenko²

2011

Preprint

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Analysis of the resistivity data recently reported by Kondo et al.[1] for (Bi, P b)2(Sr, La)2CuO 6−δ (Bi2201) single-crystals has been performed within our model developed to study pseudogap (PG) in high-Tc superconductors (HTS's). The model is based on an assumption of the existence of local pairs in HTS's at temperatures well above Tc. Comparative analysis of our results and results of ARPES experiments reported by Kondo et al. suggests the local pairs to be one of the possible reason of the PG formation.

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Pseudogap in SmFeAsO<inf>0.85</inf> in comparison with s-wave symmetry theory

Cited by 3 publications

References 13 publications

Paraconductivity of the K-doped SrFe₂As₂superconductor

Paraconductivity of the K-doped SrFe₂As₂superconductor

Hydrostatic-pressure effects on the pseudogap in slightly doped YBa2Cu3O7−δ single crystals

Pseudogap and local pairs in high-Tc cuprate superconductors

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Pseudogap in SmFeAsO<inf>0.85</inf> in comparison with s-wave symmetry theory

Cited by 3 publications

References 13 publications

Paraconductivity of the K-doped SrFe2As2superconductor

Paraconductivity of the K-doped SrFe2As2superconductor

Hydrostatic-pressure effects on the pseudogap in slightly doped YBa2Cu3O7−δ single crystals

Pseudogap and local pairs in high-Tc cuprate superconductors

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Paraconductivity of the K-doped SrFe₂As₂superconductor

Paraconductivity of the K-doped SrFe₂As₂superconductor