NDLI: Tunneling into multiband superconductors: The case of magnesium diboride and iron-based superconductors

Content Provider	IEEE Xplore Digital Library
Author	Belogolovskii, M. Seidel, P.
Copyright Year	2013
Description	Author affiliation: Donetsk Inst. for Phys. & Eng., Donetsk, Ukraine (Belogolovskii, M.) \|\| Inst. fur Festkorperphys., Friedrich-Schiller-Univ. Jena, Jena, Germany (Seidel, P.)
Abstract	Despite a long history, the two-band/two-gap theory of superconductivity (S) had no important implications in the last century. The first specific but representative case was $MgB_{2},$ a comparatively simple compound with an unexpectedly high normal-to-superconductor transition temperature $T_{c}$ = 39 K. Superconductivity in $MgB_{2}$ resides in two distinct groups of bands. Whereas the intraband impurity scattering may vary in large limits, the interband scattering remains weak. Recently, multiband superconductivity was found in iron-based pnictides and chalcogenides with strong differences comparing to $MgB_{2}:$ (i) in new materials superconductivity occurs by chemical doping of antiferromagnetic parents, thus, spin dynamics can play a central role and the Cooper pairing may be mediated by antiferromagnetic (AF) spin fluctuations (in sharp contrast to the conventional phonon mechanism in MgB2); (ii) an extended s-wave gap scenario, with opposite signs on hole and electron Fermi-surface sets, has been experimentally supported (instead of a trivial equal-sign but different-value s-wave gaps in $MgB_{2});$ (iii) the parent compounds are “bad" metals in the normal (N) state, this fact quite directly implies strong electron correlations in the Fe-based materials which, most probably, are at the boundary of electronic localization and itinerancy; (iv) the latter statement means that a strong-coupling approach to the electronic states is more appropriate for them, this fact invokes nesting of hole and electron Fermi surface pockets to drive both the spin fluctuations and superconductivity; (v) the family of iron pnictides is characterized by multi (more than two) Fermi surface sets, and an importance of multiband structure is obviously exhibited in recent measurements of the Fe isotope effect.
Starting Page	157
Ending Page	159
File Size	571276
Page Count	3
File Format	PDF
e-ISBN	9781479910687
DOI	10.1109/MSMW.2013.6622172
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-23
Publisher Place	Ukraine
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconductivity Iron Junctions Scattering Tunneling Materials Magnesium
Content Type	Text
Resource Type	Article

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