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Article: Effect of iron content and potassium substitution in A 0.8Fe 1.6Se 2 (A=K, Rb, Tl) superconductors: A Raman scattering investigation

TitleEffect of iron content and potassium substitution in A <inf>0.8</inf>Fe <inf>1.6</inf>Se <inf>2</inf> (A=K, Rb, Tl) superconductors: A Raman scattering investigation
Authors
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2012, v. 86 n. 13, article no. 134502 How to Cite?
AbstractWe have performed Raman-scattering measurements on high-quality single crystals of the superconductors K 0.8 Fe 1.6 Se 2 (T c =32 K), Tl 0.5 K 0.3 Fe 1.6 Se 2 (T c =29 K), and Tl 0.5 Rb 0.3 Fe 1.6 Se 2 (T c =31 K) as well as of the insulating compound KFe 1.5 Se 2 . To interpret our results, we have made first-principles calculations for the phonon modes in the ordered iron-vacancy structure of K 0.8 Fe 1.6 Se 2 . The modes we observe can be assigned very well from our symmetry analysis and calculations, allowing us to compare Raman-active phonons in the AFeSe compounds. We find a clear frequency difference in most phonon modes between the superconducting and nonsuperconducting potassium crystals, indicating the fundamental influence of iron content. By contrast, substitution of K by Tl or Rb in A 0.8 Fe 1.6 Se 2 causes no substantial frequency shift for any modes above 60cm - 1, demonstrating that the alkali-type metal has little effect on the microstructure of the FeSe layer. Several additional modes appear below 60 cm - 1 in Tl- and Rb-substituted samples, which are vibrations of heavier Tl and Rb ions. Finally, our calculations reveal the presence of "chiral" phonon modes, whose origin lies in the chiral nature of the K 0.8 Fe 1.6 Se 2 structure. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/254533
ISSN
2014 Impact Factor: 3.736
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhang, A. M.-
dc.contributor.authorLiu, K.-
dc.contributor.authorHe, J. B.-
dc.contributor.authorWang, D. M.-
dc.contributor.authorChen, G. F.-
dc.contributor.authorNormand, B.-
dc.contributor.authorZhang, Q. M.-
dc.date.accessioned2018-06-19T15:40:48Z-
dc.date.available2018-06-19T15:40:48Z-
dc.date.issued2012-
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2012, v. 86 n. 13, article no. 134502-
dc.identifier.issn1098-0121-
dc.identifier.urihttp://hdl.handle.net/10722/254533-
dc.description.abstractWe have performed Raman-scattering measurements on high-quality single crystals of the superconductors K 0.8 Fe 1.6 Se 2 (T c =32 K), Tl 0.5 K 0.3 Fe 1.6 Se 2 (T c =29 K), and Tl 0.5 Rb 0.3 Fe 1.6 Se 2 (T c =31 K) as well as of the insulating compound KFe 1.5 Se 2 . To interpret our results, we have made first-principles calculations for the phonon modes in the ordered iron-vacancy structure of K 0.8 Fe 1.6 Se 2 . The modes we observe can be assigned very well from our symmetry analysis and calculations, allowing us to compare Raman-active phonons in the AFeSe compounds. We find a clear frequency difference in most phonon modes between the superconducting and nonsuperconducting potassium crystals, indicating the fundamental influence of iron content. By contrast, substitution of K by Tl or Rb in A 0.8 Fe 1.6 Se 2 causes no substantial frequency shift for any modes above 60cm - 1, demonstrating that the alkali-type metal has little effect on the microstructure of the FeSe layer. Several additional modes appear below 60 cm - 1 in Tl- and Rb-substituted samples, which are vibrations of heavier Tl and Rb ions. Finally, our calculations reveal the presence of "chiral" phonon modes, whose origin lies in the chiral nature of the K 0.8 Fe 1.6 Se 2 structure. © 2012 American Physical Society.-
dc.languageeng-
dc.publisherAmerican Physical Society. The Journal's web site is located at http://journals.aps.org/prb/-
dc.relation.ispartofPhysical Review B (Condensed Matter and Materials Physics)-
dc.titleEffect of iron content and potassium substitution in A <inf>0.8</inf>Fe <inf>1.6</inf>Se <inf>2</inf> (A=K, Rb, Tl) superconductors: A Raman scattering investigation-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1103/PhysRevB.86.134502-
dc.identifier.scopuseid_2-s2.0-84867065002-
dc.identifier.volume86-
dc.identifier.issue13-
dc.identifier.spagearticle no. 134502-
dc.identifier.epagearticle no. 134502-
dc.identifier.eissn1550-235X-
dc.identifier.isiWOS:000309345200005-
dc.identifier.issnl1098-0121-

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