Iron-based superconductors: tales from the nuclei

Carretta, P.; Prando, Giacomo

doi:10.1007/s40766-019-0001-1

Cited by 12 publications

(6 citation statements)

References 215 publications

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“…To stabilize of a non-zero superconducting parameter order, Anderson's above-mentioned argument about the two atoms per unit cell proves critical. We argued that a tRVB state is consistent with the body of available experimental data, from Knight shift [56], quasi-particle interference [57,58] and neutron spinresonance measurements [9]. Moreover, a tRVB order parameter is relatively robust against disorder and predicts staggered component to the pair wavefunction that, we argued, will be discernible using scanning Josephson spectroscopy.…”

Section: Introductionsupporting

confidence: 75%

Triplet pairing, orbital selectivity and correlations in Iron-based superconductors

Komijani¹,

König²,

Coleman³

2023

Preprint

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We use a slave-boson approach to study the band renormalization and pair susceptibility in the normal state of iron-based superconductors in presence of strong Coulomb repulsion and Hund's interaction. Our results show orbital selectivity toward localization of xy orbitals and its interplay with superconductivity. We also compare the recently proposed triplet resonating valence bond theory of superconductivity in Iron based superconductors with the more conventional s± pairing and show that both favor a superconductivity when the xy orbital is delocalized.

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Section: Introductionsupporting

confidence: 75%

Triplet pairing, orbital selectivity and correlations in Iron-based superconductors

Komijani¹,

König²,

Coleman³

2023

Preprint

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“…In Figure 8, the magnitude of the gap (shown by the colormap) is represented on a generic Fermi surface consisting of two tubular Fermi sheets in the first Brillouin zone for two cases: when the d-wave gap value exceeds the s-wave gap (panel a, below T * ) and for the opposite situation (panel b, above T * ). It is clear the tetragonal symmetry is lost that in both cases and only twofold symmetry is retained, as occurs in the nematic state [40]. Moreover, the order parameter is nodal only at low temperature, and the system shows a transition to a fully gapped order parameter at T * .…”

Section: Resultsmentioning

confidence: 94%

S+-+d Wave Multiband Eliashberg Theory For The Iron Pnictides

Ummarino¹,

Torsello²

2022

Preprint

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We calculated the critical temperature in the framework of s ± + d-wave multiband Eliashberg theory. We have solved these equations numerically to see at what values of the input parameters there is a solution with a non-zero critical temperature and what is the symmetry of the order parameter of this solution. For our model we consider the pnictide case with simplifications that allow us to obtain the most general possible information. For selected and representative cases in which the order parameter has s ± + d symmetry, we calculated the superconducting density of states, the temperature dependence of the gaps, and the superfluid density so that comparison with experimental data can be made. Finally, we show that such a system has only a twofold in-plane symmetry and undergoes a transition from nodal to fully gapped with increasing temperature.

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“…and it is taken when ω µ τ c = 1. Assuming ∆ ∼ 10 G as typical value for the fluctuating magnetic field induced by the motion of vortices [36] and B µ ∼ 1 kG as lower bound for the magnetic field at the muon site, we estimate λ V −AV L max ∼ 8.5 × 10 −3 µs −1 as upper-bound value of the maximum relaxation rate. The typical experimental values reported for λ L in Fig.…”

Section: Discussionmentioning

confidence: 90%

Complex vortex-antivortex dynamics in the magnetic superconductor EuFe$_{2}$(As$_{0.7}$P$_{0.3}$)$_{2}$

Prando,

Torsello,

Sanna

et al. 2022

Preprint

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We report on the investigation of the magnetic superconductor EuFe 2 (As 0.7 P 0.3 ) 2 based on muon-spin spectroscopy and ac magnetic susceptibility (χ) measurements. The dependence of the internal field at the muon site on temperature is indicative of a ferromagnetic ordering of Eu 2+ magnetic moments and only the conventional magnon scattering governs the longitudinal relaxation rate at low temperatures. At the same time, we observe a rich phenomenology for the imaginary component of the susceptibility χ by means of both standard ac susceptibility and a novel technique based on a microwave coplanar waveguide resonator. In particular, we detect activated trends for several features in χ over frequencies spanning ten orders of magnitude. We interpret our results in terms of the complex dynamics of vortices and antivortices influenced by the underlying structure of magnetic domains.

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Iron-based superconductors: tales from the nuclei

Cited by 12 publications

References 215 publications

Triplet pairing, orbital selectivity and correlations in Iron-based superconductors

Triplet pairing, orbital selectivity and correlations in Iron-based superconductors

S+-+d Wave Multiband Eliashberg Theory For The Iron Pnictides

Complex vortex-antivortex dynamics in the magnetic superconductor EuFe$_{2}$(As$_{0.7}$P$_{0.3}$)$_{2}$

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