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Article: Spin fluctuations, interband coupling and unconventional pairing in iron-based superconductors

TitleSpin fluctuations, interband coupling and unconventional pairing in iron-based superconductors
Authors
Issue Date2009
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/EJ/journal/NJP
Citation
New Journal Of Physics, 2009, v. 11 How to Cite?
AbstractBased on an effective two-band model and using the fluctuation-exchange (FLEX) approach, we explore spin fluctuations and unconventional superconducting pairing in Fe-based layer superconductors. It is elaborated that one type of interband antiferromagnetic (AF) spin fluctuation stems from the interband Coulomb repulsion, whereas the other type of intraband AF spin fluctuation originates from the intraband Coulomb repulsion. Due to the Fermi-surface topology, a spin-singlet extended s-wave superconducting state is more favorable than the nodal dXY-wave state if the interband AF spin fluctuation is more significant than the intraband one, otherwise vice versa. It is also revealed that the effective interband coupling plays an important role in the intraband pairings, which is a distinct feature of the present two-band system. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
Persistent Identifierhttp://hdl.handle.net/10722/59666
ISSN
2015 Impact Factor: 3.57
2015 SCImago Journal Rankings: 1.902
ISI Accession Number ID
Funding AgencyGrant Number
NSFC10525415
10429401
RGCHKU-3/05C
973 project2006CB601002
2006CB921800
Ministry of Education of ChinaNCET-04-0453
Funding Information:

We thank F C Zhang, Q Han, Y Chen, X Dai, Z Fang, T K Ng, Q H Wang, H H Wen and S C Zhang for many helpful discussions. The work was supported by the NSFC (10525415 and 10429401), the RGC grants of Hong Kong (HKU-3/05C), the 973 project (2006CB601002, 2006CB921800) and the Ministry of Education of China (grant no. NCET-04-0453).

References

 

DC FieldValueLanguage
dc.contributor.authorYao, ZJen_HK
dc.contributor.authorLi, JXen_HK
dc.contributor.authorWang, ZDen_HK
dc.date.accessioned2010-05-31T03:54:47Z-
dc.date.available2010-05-31T03:54:47Z-
dc.date.issued2009en_HK
dc.identifier.citationNew Journal Of Physics, 2009, v. 11en_HK
dc.identifier.issn1367-2630en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59666-
dc.description.abstractBased on an effective two-band model and using the fluctuation-exchange (FLEX) approach, we explore spin fluctuations and unconventional superconducting pairing in Fe-based layer superconductors. It is elaborated that one type of interband antiferromagnetic (AF) spin fluctuation stems from the interband Coulomb repulsion, whereas the other type of intraband AF spin fluctuation originates from the intraband Coulomb repulsion. Due to the Fermi-surface topology, a spin-singlet extended s-wave superconducting state is more favorable than the nodal dXY-wave state if the interband AF spin fluctuation is more significant than the intraband one, otherwise vice versa. It is also revealed that the effective interband coupling plays an important role in the intraband pairings, which is a distinct feature of the present two-band system. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://www.iop.org/EJ/journal/NJPen_HK
dc.relation.ispartofNew Journal of Physicsen_HK
dc.titleSpin fluctuations, interband coupling and unconventional pairing in iron-based superconductorsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1367-2630&volume=11&spage=025009: 1&epage=8&date=2009&atitle=Spin+fluctuations,+interband+coupling+and+unconventional+pairing+in+iron-based+superconductorsen_HK
dc.identifier.emailYao, ZJ: zjyao@hku.hken_HK
dc.identifier.emailWang, ZD: zwang@hkucc.hku.hken_HK
dc.identifier.authorityYao, ZJ=rp00828en_HK
dc.identifier.authorityWang, ZD=rp00802en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1088/1367-2630/11/2/025009en_HK
dc.identifier.scopuseid_2-s2.0-63449089120en_HK
dc.identifier.hkuros155370en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-63449089120&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume11en_HK
dc.identifier.eissn1367-2630-
dc.identifier.isiWOS:000263744200008-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridYao, ZJ=24172115800en_HK
dc.identifier.scopusauthoridLi, JX=8678926100en_HK
dc.identifier.scopusauthoridWang, ZD=14828459100en_HK
dc.identifier.citeulike4113200-

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