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Article: Superconducting proximity effect on the block antiferromagnetism in K yFe 2-xSe 2

TitleSuperconducting proximity effect on the block antiferromagnetism in K yFe 2-xSe 2
Authors
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B - Condensed Matter And Materials Physics, 2012, v. 85 n. 10 How to Cite?
AbstractIt has been recently discovered that the superconducting (SC) ternary iron selenides have a block antiferromagnetic (AFM) long-range order. Many experiments show a possible mesoscopic phase separation of the superconductivity and antiferromagnetism, while a neutron experiment reveals a sizable suppression of magnetic moment due to the superconductivity, indicating a possible phase coexistence. Here we propose that the observed suppression of the magnetic moment may be explained by the proximity effect within a phase-separation scenario. We use a two-orbital model to study the proximity effect on a layer of the block AFM state induced by neighboring SC layers via an interlayer tunneling mechanism. We argue that the proximity effect in ternary Fe selenides should be large because of the large interlayer coupling and weak electron correlation. The result of our mean-field theory is compared with the neutron experiments semiquantitatively. The suppression of the magnetic moment due to the SC proximity effect is found to be more pronounced in d-wave superconductivity and may be enhanced by the frustrated structure of the block AFM state. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/146414
ISSN
2014 Impact Factor: 3.736
2015 SCImago Journal Rankings: 1.933
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong's RGCGRF HKU706809
HKUST3/CRF/09
NSFC10904062
Hangzhou Normal UniversityHSKQ0043
HNUEYT
NSF of Zhejiang ProvinceZ6110033
Funding Information:

We thank W. Bao, G. Aeppli, Y. Zhou, and T. M. Rice for helpful discussions. This work is supported in part by Hong Kong's RGC GRF HKU706809 and HKUST3/CRF/09. H.M.J. is grateful to the NSFC (Grant No. 10904062), Hangzhou Normal University (HSKQ0043, HNUEYT), and the NSF of Zhejiang Province (No. Z6110033).

References
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DC FieldValueLanguage
dc.contributor.authorJiang, HMen_HK
dc.contributor.authorChen, WQen_HK
dc.contributor.authorYao, ZJen_HK
dc.contributor.authorZhang, FCen_HK
dc.date.accessioned2012-04-24T07:52:14Z-
dc.date.available2012-04-24T07:52:14Z-
dc.date.issued2012en_HK
dc.identifier.citationPhysical Review B - Condensed Matter And Materials Physics, 2012, v. 85 n. 10en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/146414-
dc.description.abstractIt has been recently discovered that the superconducting (SC) ternary iron selenides have a block antiferromagnetic (AFM) long-range order. Many experiments show a possible mesoscopic phase separation of the superconductivity and antiferromagnetism, while a neutron experiment reveals a sizable suppression of magnetic moment due to the superconductivity, indicating a possible phase coexistence. Here we propose that the observed suppression of the magnetic moment may be explained by the proximity effect within a phase-separation scenario. We use a two-orbital model to study the proximity effect on a layer of the block AFM state induced by neighboring SC layers via an interlayer tunneling mechanism. We argue that the proximity effect in ternary Fe selenides should be large because of the large interlayer coupling and weak electron correlation. The result of our mean-field theory is compared with the neutron experiments semiquantitatively. The suppression of the magnetic moment due to the SC proximity effect is found to be more pronounced in d-wave superconductivity and may be enhanced by the frustrated structure of the block AFM state. © 2012 American Physical Society.en_HK
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physicsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.titleSuperconducting proximity effect on the block antiferromagnetism in K yFe 2-xSe 2en_HK
dc.typeArticleen_HK
dc.identifier.emailChen, WQ: wqchen@hku.hken_HK
dc.identifier.emailYao, ZJ: zjyao@hku.hken_HK
dc.identifier.emailZhang, FC: fuchun@hkucc.hku.hken_HK
dc.identifier.authorityChen, WQ=rp00673en_HK
dc.identifier.authorityYao, ZJ=rp00828en_HK
dc.identifier.authorityZhang, FC=rp00840en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevB.85.104506en_HK
dc.identifier.scopuseid_2-s2.0-84863388296en_HK
dc.identifier.hkuros199353en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84863388296&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume85en_HK
dc.identifier.issue10en_HK
dc.identifier.isiWOS:000301407900003-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectQuantum Order in Novel Materials: Superconductivity and Topological Order-
dc.relation.projectQuantum Order in Novel Materials: Superconductivity and Topological Order-
dc.relation.projectQuantum Order in Novel Materials: Superconductivity and Topological Order-
dc.identifier.scopusauthoridJiang, HM=14013285400en_HK
dc.identifier.scopusauthoridChen, WQ=36077405600en_HK
dc.identifier.scopusauthoridYao, ZJ=24172115800en_HK
dc.identifier.scopusauthoridZhang, FC=14012468800en_HK

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