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Article: A generic two-band model for unconventional superconductivity and spin-density-wave order in electron- and hole-doped iron-based superconductors

TitleA generic two-band model for unconventional superconductivity and spin-density-wave order in electron- and hole-doped iron-based superconductors
Authors
Issue Date2008
PublisherInstitute of Physics Publishing Ltd.. The Journal's web site is located at http://iopscience.iop.org/0295-5075
Citation
EPL, 2008, v. 82 n. 3, article no. 37007 How to Cite?
AbstractBased on experimental data on the newly synthesized iron-based superconductors and the relevant band structure calculations, we propose a minimal two-band BCS-type Hamiltonian with the interband Hubbard interaction included. We illustrate that this two-band model is able to capture the essential features of unconventional superconductivity and spin-density-wave (SDW) ordering in this family of materials. It is found that bound electron-hole pairs can be condensed to reveal the SDW ordering for zero and very small doping, while the superconducting ordering emerges at small finite doping, whose pairing symmetry is qualitatively analyzed to be of nodal d-wave. The derived analytical formulas not only give out a nearly symmetric phase diagram for electron and hole doping, but also are likely able to account for existing main experimental results. Moreover, we also derive two important relations for a general two-band model and elaborate how to apply them to determine the band width ratio and the effective interband coupling strength from experimental data. © 2008 Europhysics Letters Association.
Persistent Identifierhttp://hdl.handle.net/10722/80850
ISSN
2015 Impact Factor: 1.963
2015 SCImago Journal Rankings: 0.565
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHan, Qen_HK
dc.contributor.authorChen, Yen_HK
dc.contributor.authorWang, ZDen_HK
dc.date.accessioned2010-09-06T08:10:58Z-
dc.date.available2010-09-06T08:10:58Z-
dc.date.issued2008en_HK
dc.identifier.citationEPL, 2008, v. 82 n. 3, article no. 37007en_HK
dc.identifier.issn0295-5075en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80850-
dc.description.abstractBased on experimental data on the newly synthesized iron-based superconductors and the relevant band structure calculations, we propose a minimal two-band BCS-type Hamiltonian with the interband Hubbard interaction included. We illustrate that this two-band model is able to capture the essential features of unconventional superconductivity and spin-density-wave (SDW) ordering in this family of materials. It is found that bound electron-hole pairs can be condensed to reveal the SDW ordering for zero and very small doping, while the superconducting ordering emerges at small finite doping, whose pairing symmetry is qualitatively analyzed to be of nodal d-wave. The derived analytical formulas not only give out a nearly symmetric phase diagram for electron and hole doping, but also are likely able to account for existing main experimental results. Moreover, we also derive two important relations for a general two-band model and elaborate how to apply them to determine the band width ratio and the effective interband coupling strength from experimental data. © 2008 Europhysics Letters Association.en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd.. The Journal's web site is located at http://iopscience.iop.org/0295-5075en_HK
dc.relation.ispartofEPLen_HK
dc.rightsEurophysics Letters. Copyright © E D P Sciences.en_HK
dc.titleA generic two-band model for unconventional superconductivity and spin-density-wave order in electron- and hole-doped iron-based superconductorsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0295-5075&volume=82&spage=37007: 1&epage=6&date=2008&atitle=A+generic+two-band+model+for+unconventional+superconductivity+and+spin-density-wave+order+in+electron-+and+hole-doped+iron-based+superconductorsen_HK
dc.identifier.emailWang, ZD: zwang@hkucc.hku.hken_HK
dc.identifier.authorityWang, ZD=rp00802en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1209/0295-5075/82/37007en_HK
dc.identifier.scopuseid_2-s2.0-79051468966en_HK
dc.identifier.hkuros141687en_HK
dc.identifier.volume82en_HK
dc.identifier.issue3en_HK
dc.identifier.spagearticle no. 37007-
dc.identifier.epagearticle no. 37007-
dc.identifier.isiWOS:000255369500026-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHan, Q=7202485348en_HK
dc.identifier.scopusauthoridChen, Y=7601428042en_HK
dc.identifier.scopusauthoridWang, ZD=14828459100en_HK
dc.identifier.citeulike2972013-

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