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New Fe-based superconductors: properties relevant for applications | | M Putti
; I Pallecchi
; E Bellingeri
; M Tropeano
; C Ferdeghini
; A Palenzona C Tarantini
; A Yamamoto
; J Jiang
; J Jaroszynski
; F Kametani
; D Abraimov
; A Polyanskii
; J D Weiss
; E E Hellstrom
; A Gurevich
; D C Larbalestier
; R Jin
; B C Sales
; A S Sefat
; M A McGuire
; D Mandrus
; P Cheng
; Y Jia
; H H Wen
; S Lee
; C B Eom
; | | Date: |
7 Oct 2009 | | Abstract: | Less than two years after the discovery of high temperature superconductivity
in oxypnictide LaFeAs(O,F) several families of superconductors based on Fe
layers (1111, 122, 11, 111) are available. They share several characteristics
with cuprate superconductors that compromise easy applications, such as the
layered structure, the small coherence length, and unconventional pairing, On
the other hand the Fe-based superconductors have metallic parent compounds, and
their electronic anisotropy is generally smaller and does not strongly depend
on the level of doping, the supposed order parameter symmetry is s wave, thus
in principle not so detrimental to current transmission across grain
boundaries. From the application point of view, the main efforts are still
devoted to investigate the superconducting properties, to distinguish intrinsic
from extrinsic behaviours and to compare the different families in order to
identify which one is the fittest for the quest for better and more practical
superconductors. The 1111 family shows the highest Tc, huge but also the most
anisotropic upper critical field and in-field, fan-shaped resistive transitions
reminiscent of those of cuprates, while the 122 family is much less anisotropic
with sharper resistive transitions as in low temperature superconductors, but
with about half the Tc of the 1111 compounds. An overview of the main
superconducting properties relevant to applications will be presented. Upper
critical field, electronic anisotropy parameter, intragranular and
intergranular critical current density will be discussed and compared, where
possible, across the Fe-based superconductor families. | | Source: | arXiv, 0910.1297 | | Services: | Forum | Review | PDF | Favorites | |
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