Show simple item record

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorPOUCHARD, Michel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorVILLESUZANNE, Antoine
dc.date.issued2020-12
dc.identifier.issn2410-3896
dc.description.abstractEnFrom a tight-binding approach to the instability of nonbonding electronic states, along a double-well potential, we consider here how the coupling of these states with a phonon mode can open a superconducting gap at the Fermi level. The alternation of broken- and unbroken-symmetry states, along the phonon breathing distortion, induces the mixing of band-edge states on a very short timescale, according to the noncrossing rule of chemists. We show that this mixing may generate cationic and anionic disproportionation. The negative U mechanism is thus justified here, leading to the mixing of occupied and unoccupied pair states, for the opening of a 2Δ superconducting gap. The closeness of broad σ * and narrow π * bands in the vicinity of the Fermi level should favor the superconducting phase over the insulating or metallic state, in agreement with Micnas et al.’s studies. We applied this approach to several families of superconducting materials, i.e., doped strontium titanate, high-TC cuprates and iron selenide.
dc.language.isoen
dc.publisherMDPI
dc.subject.ennonbonding electrons
dc.subject.ennoncrossing rule
dc.subject.ennegative-u mechanism
dc.subject.enphonons
dc.subject.enBCS theory
dc.subject.endisproportionation
dc.subject.enhole pairing
dc.subject.encuprates
dc.subject.entitanates
dc.subject.eniron selenide
dc.title.enAre superconductivity mechanisms a matter for chemists?
dc.typeArticle de revue
dc.identifier.doi10.3390/condmat5040067
dc.subject.halChimie/Matériaux
bordeaux.journalCondensed Matter
bordeaux.page67 (30 p.)
bordeaux.volume5
bordeaux.issue4
bordeaux.peerReviewedoui
hal.identifierhal-02982358
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02982358v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Condensed%20Matter&rft.date=2020-12&rft.volume=5&rft.issue=4&rft.spage=67%20(30%20p.)&rft.epage=67%20(30%20p.)&rft.eissn=2410-3896&rft.issn=2410-3896&rft.au=POUCHARD,%20Michel&VILLESUZANNE,%20Antoine&rft.genre=article


Files in this item

FilesSizeFormatView

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record