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Article: Theory for superconductivity in iron pnictides at large Coulomb U limit

TitleTheory for superconductivity in iron pnictides at large Coulomb U limit
Authors
KeywordsIron-based superconductor
Strong coupling theory
Issue Date2009
PublisherHigher Education Press and Springer-Verlag GmbH. The Journal's web site is located at http://www.springerlink.com/content/1673-3487/
Citation
Frontiers Of Physics In China, 2009, v. 4 n. 4, p. 447-454 How to Cite?
AbstractSuperconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. The pairing is found mainly from the scattering within the same Fermi pocket where usually one single orbital dominates. The inter-pocket pair scatterings determine the symmetry of the singlet superconductivity, which is an extended s-wave at small Hund's coupling, and d-wave at large Hund's coupling and large U. The former is consistent with recent experiments of ARPES and Andreev reflection spectroscopy. Spin triplet states only become important at large exchange interaction J. © Higher Education Press and Springer-Verlag 2009.
Persistent Identifierhttp://hdl.handle.net/10722/125285
ISSN
2012 Impact Factor: 1.444
2014 SCImago Journal Rankings: 0.905
ISI Accession Number ID
Funding AgencyGrant Number
IIKSAR
Swiss National Foundation through the MANEP network
Funding Information:

We wish to acknowledge the partial support from the RGC grant of IIKSAR and from the Swiss National Foundation through the MANEP network.

References

 

DC FieldValueLanguage
dc.contributor.authorChen, WQen_HK
dc.contributor.authorYang, KYen_HK
dc.contributor.authorZhou, Yen_HK
dc.contributor.authorZhang, FCen_HK
dc.date.accessioned2010-10-31T11:22:15Z-
dc.date.available2010-10-31T11:22:15Z-
dc.date.issued2009en_HK
dc.identifier.citationFrontiers Of Physics In China, 2009, v. 4 n. 4, p. 447-454en_HK
dc.identifier.issn1673-3487en_HK
dc.identifier.urihttp://hdl.handle.net/10722/125285-
dc.description.abstractSuperconductivity in iron pnictides is studied by using a two-orbital Hubbard model in the large U limit. The Coulomb repulsion induces an orbital-dependent pairing between charge carriers. The pairing is found mainly from the scattering within the same Fermi pocket where usually one single orbital dominates. The inter-pocket pair scatterings determine the symmetry of the singlet superconductivity, which is an extended s-wave at small Hund's coupling, and d-wave at large Hund's coupling and large U. The former is consistent with recent experiments of ARPES and Andreev reflection spectroscopy. Spin triplet states only become important at large exchange interaction J. © Higher Education Press and Springer-Verlag 2009.en_HK
dc.languageengen_HK
dc.publisherHigher Education Press and Springer-Verlag GmbH. The Journal's web site is located at http://www.springerlink.com/content/1673-3487/en_HK
dc.relation.ispartofFrontiers of Physics in Chinaen_HK
dc.rightsThe original publication is available at www.springerlink.com-
dc.subjectIron-based superconductoren_HK
dc.subjectStrong coupling theoryen_HK
dc.titleTheory for superconductivity in iron pnictides at large Coulomb U limiten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1673-3487&volume=4&issue=4&spage=447&epage=454&date=2009&atitle=Theory+for+superconductivity+in+iron+pnictides+at+large+Coulomb+U+limit-
dc.identifier.emailChen, WQ: wqchen@hku.hken_HK
dc.identifier.emailZhang, FC: fuchun@hkucc.hku.hken_HK
dc.identifier.authorityChen, WQ=rp00673en_HK
dc.identifier.authorityZhang, FC=rp00840en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1007/s11467-009-0041-7en_HK
dc.identifier.scopuseid_2-s2.0-70350627107en_HK
dc.identifier.hkuros182055en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-70350627107&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume4en_HK
dc.identifier.issue4en_HK
dc.identifier.spage447en_HK
dc.identifier.epage454en_HK
dc.identifier.isiWOS:000280414200003-
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridChen, WQ=36077405600en_HK
dc.identifier.scopusauthoridYang, KY=7404291063en_HK
dc.identifier.scopusauthoridZhou, Y=8862218900en_HK
dc.identifier.scopusauthoridZhang, FC=14012468800en_HK
dc.identifier.citeulike4784181-

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