Paraconductivity of doped LaOFeAs superconductors

Liu, Shengli; Wang, Haiyun; Bao, Gang

doi:10.1016/j.ssc.2010.10.041

Cited by 11 publications

(18 citation statements)

References 28 publications

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“…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]. Finally, in both electron-and hole-doped LaOFeAs compounds, a paraconductivity study has been realized and it is found that the experimental data can be explained within a 3D Aslamazov-Larkin (AL) theory [19]. For completeness, we would like to point out that all these results have been obtained using polycrystalline samples.…”

Section: Introductionsupporting

confidence: 58%

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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: Introductionsupporting

confidence: 58%

“…18 Finally, in both electron-and hole-doped LaOFeAs compounds a paraconductivity study has been realized and it is found that the experimental data can be explained within a 3D AL theory. 19 For completeness, we would like to point out that all these results have been obtained using polycrystalline samples.…”

Section: Introductionmentioning

confidence: 99%

Paraconductivity of the K-doped SrFe₂As₂superconductor

Marra

Nigro

et al. 2012

New J. Phys.

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“…[25][26][27][28][29][30][31] It is expected that fluctuation effects around the superconducting transition may also present differences in these two types of iron pnictides. 32 These effects have been already investigated in presence of charge-doping, [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] but to our knowledge still remain unexplored in isovalently substituted iron-pnictides.…”

Section: Introductionmentioning

confidence: 99%

Superconducting fluctuations in isovalently substitutedBaFe2(As1−xPx)2: Possible observation of multiband effects

et al. 2015

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The nature of superconducting fluctuation effects in the isovalently-substituted iron pnictide BaFe2(As1−xPx)2 (x ≈ 0.35) is probed through measurements of the magnetization and magnetoconductivity around the superconducting transition. The results, obtained with magnetic fields up to 9 T applied in the two main crystal directions, are consistent with anisotropic Ginzburg-Landau (GL) approaches for finite applied magnetic fields. The analysis allowed to determine with accuracy the out-of-plane, ξc(0), and in-plane, ξ ab (0), GL coherence lengths. Significant differences are found between the ξc(0) values resulting from electrical transport and magnetization data. According to recent theoretical approaches, these differences could be interpreted in terms of the multiband nature of this material. The analysis of data in the low field region around the transition temperature also suggests that phase fluctuations, although possibly relevant in other Fe-based superconductors, may play a negligible role in this compound. * j.mosqueira@usc.es

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“…The fluctuation effects have been recently used in a number of works to characterize the superconducting properties of Fe-based superconductors, through observables like the electrical conductivity, magnetization, or specific heat [4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25]. Nowadays, the properties of these materials at the optimal doping were extensively studied and are already rather well understood.…”

Section: Introductionmentioning

confidence: 99%

Large increase of the anisotropy factor in the overdoped region of Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$ as probed by fluctuation spectroscopy

Ramos-Álvarez,

Mosqueira,

Vidal

et al. 2015

Preprint

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We study the diamagnetism induced by thermal fluctuations above the superconducting transition of the iron pnictide Ba(Fe 1−x Nix) 2 As 2 with different doping levels. The measurements are performed with magnetic fields up to 7 T applied in the two main crystal directions. These data provide double information: first, they confirm at a quantitative level the applicability to these materials of a 3D-anisotropic Ginzburg-Landau approach valid in the finite field regime. Then, they allow to determine the doping-level dependence of the in-plane coherence length and of the superconducting anisotropy factor, γ. Our results provide a stringent confirmation of the large increase of γ with the doping level, as recently proposed from magnetoresistivity measurements. The implications of the applicability of the model used to a multiband superconductor are discussed.

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Paraconductivity of doped LaOFeAs superconductors

Cited by 11 publications

References 28 publications

Paraconductivity of the K-doped SrFe₂As₂superconductor

Paraconductivity of the K-doped SrFe₂As₂superconductor

Superconducting fluctuations in isovalently substitutedBaFe2(As1−xPx)2: Possible observation of multiband effects

Large increase of the anisotropy factor in the overdoped region of Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$ as probed by fluctuation spectroscopy

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Paraconductivity of doped LaOFeAs superconductors

Cited by 11 publications

References 28 publications

Paraconductivity of the K-doped SrFe2As2superconductor

Paraconductivity of the K-doped SrFe2As2superconductor

Superconducting fluctuations in isovalently substitutedBaFe2(As1−xPx)2: Possible observation of multiband effects

Large increase of the anisotropy factor in the overdoped region of Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$ as probed by fluctuation spectroscopy

Contact Info

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Paraconductivity of the K-doped SrFe₂As₂superconductor

Paraconductivity of the K-doped SrFe₂As₂superconductor