Neutron Irradiation of Sm-1111

Eisterer, M.; Weber, H. W.; Jiang, J.; Weiss, J. D.; Yamamoto, A.; Polyanskii, A. A.; Hellstrom, E. E.; Larbalestier, D. C.

doi:10.48550/arxiv.0904.2442

2009

DOI: 10.48550/arxiv.0904.2442

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Neutron Irradiation of Sm-1111

M. Eisterer,

H. W. Weber,

J. Jiang

et al.

Abstract: SmFeAsO 1−x F x was irradiated in a fission reactor to a fast (E > 0.1 MeV) neutron fluence of 4 × 10 21 m −2 . The introduced defects increase the normal state resistivity due to a reduction in the mean free path of the charge carriers. This leads to an enhancement of the upper critical field at low temperatures. The critical current density within the grains, J c , increases upon irradiation.The second maximum in the field dependence of J c disappears and the critical current density becomes a monotonically … Show more

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“…After irradiation the MgB 2 compound demonstrated a relatively weak change of the superconducting temperature T c , which is typical of the systems with a strong electronphonon interaction and isotropic s-type pairing [11,12,13]. In the Cu-based superconductors such as YBa 2 Cu 3 O 7 [13,14,15,16,17,18] as well as the FeAs-based superconductors [19,20,21], the fast and complete suppression of superconductivity under the high-energy particles irradiation evidences a more exotic (non-fononic) pairing mechanism.…”

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Superconductivity in iron silicideLu2Fe3Si5probed by radiation-induced disordering

et al. 2011

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PACS: 74.70._b, 74.62.Dh, 72.15.Gd. Resistivity ρ(T), Hall coefficient R H (T), superconducting temperature T c , and the slope of the upper critical field −dH с2 /dT were studied in poly-and single-crystalline samples of the Fe-based superconductor Lu 2 Fe 3 Si 5 irradiated by fast neutrons. Atomic disordering induced by the neutron irradiation leads to a fast suppression of T c similarly to the case of doping of Lu 2 Fe 3 Si 5 with magnetic (Dy) and non-magnetic (Sc, Y) impurities. The same effect was observed in a novel FeAs-based superconductor La(O-F)FeAs after irradiation. Such behavior is accounted for by strong pair breaking that is traceable to scattering at non-magnetic impurities or radiation defects in unconventional superconductors. In such superconductors the sign of the order parameter changes between the different Fermi sheets (s ± model). Some relations that are specified for the properties of the normal and superconducting states in high-temperature superconductors are also observed in Lu 2 Fe 3 Si 5 . The first is the relationship −dH c2 /dT ~ T c , instead of the one expected for dirty superconductors −dH c2 /dT ~ ρ 0 . The second is a correlation between the low-temperature linear coefficient a in the resistivity ρ = ρ 0 + a 1 T, which appears presumably due to the scattering at magnetic fluctuations, and T c ; this correlation being an evidence of a tight relation between the superconductivity and magnetism. The data point to an unconventional (non-fononic) mechanism of superconductivity in Lu 2 Fe 3 Si 5 , and, probably, in some other Fe-based compounds, which can be fruitfully studied via the radiation-induced disordering.The discovery of high-temperature superconductivity in layered iron-based compounds [1] stimulated active experimental and theoretical studies of these systems in view of the possibility of the Cooper pairing of charge carriers by an anomalous type. Hence, a systematic study of the disordering effects in new superconductors is especially important [2]. According to the Anderson theorem [3], nonmagnetic impurities do not cause a suppression of the superconductivity in the case of a conventional s-type isotropic pairing. If the singlet pairing is traceable to the exchange of spin excitations, the requirement for this is the symmetry with a sign-changing order parameter [4]. Evidently, such requirement is fulfilled in high-T c cuprates, where pairing with d-wave symmetry is realized, while the pairing process proper is destroyed by an intraband scattering at nonmagnetic centers [4,5,6]. In the FeAs-based superconductors, the ordering parameter has the s-type symmetry, therefore a generally accepted is the s ± -model, which treats a superconducting state with the opposite signs of the ordering parameter for electrons and holes [7,4,8,9]. In this case nonmagnetic scatters must lead to the suppression of superconductivity due to the interband scattering between the electron-and hole-type Fermi surfaces [4,5,10]. Thus, the study of the atomic disordering in superconducting ...

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Superconductivity in iron silicideLu2Fe3Si5probed by radiation-induced disordering

et al. 2011

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Neutron Irradiation of Sm-1111

Cited by 1 publication

References 38 publications

Superconductivity in iron silicideLu2Fe3Si5probed by radiation-induced disordering

Superconductivity in iron silicideLu2Fe3Si5probed by radiation-induced disordering

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