Phonon anomalies in pure and underdoped R1-xKxFe2As2 (R=Ba, Sr) investigated by raman light scattering

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dc.contributor.authorRahlenbeck, Men_AU
dc.contributor.authorSun, GLen_AU
dc.contributor.authorSun, DLen_AU
dc.contributor.authorLin, CTen_AU
dc.contributor.authorKeimer, Ben_AU
dc.contributor.authorUlrich, Cen_AU
dc.date.accessioned2009-11-05T05:52:30Zen_AU
dc.date.accessioned2010-04-30T05:05:04Zen_AU
dc.date.available2009-11-05T05:52:30Zen_AU
dc.date.available2010-04-30T05:05:04Zen_AU
dc.date.issued2009-08en_AU
dc.date.statistics2009-08en_AU
dc.description.abstractWe present a detailed temperature-dependent Raman light scattering study of optical phonons in Ba1-xKxFe2As2 (x similar to 0.28, superconducting T-c similar to 29 K), Sr1-xKxFe2As2 (x similar to 0.15, T-c similar to 29 K), and nonsuperconducting BaFe2As2 single crystals. In all samples we observe a strong continuous narrowing of the Raman-active Fe and As vibrations upon cooling below the spin-density wave transition T-s. We attribute this effect to the opening of the spin-density wave gap. The electron-phonon linewidths inferred from these data greatly exceed the predictions of ab initio density-functional calculations without spin polarization, which may imply that local magnetic moments survive well above T-s. A first-order structural transition accompanying the spin-density wave transition induces discontinuous jumps in the phonon frequencies. These anomalies are increasingly suppressed for higher potassium concentrations. We also observe subtle phonon anomalies at the superconducting transition temperature T-c with a behavior qualitatively similar to that in the cuprate superconductors. © 2009, American Physical Societyen_AU
dc.identifier.articlenumber064509en_AU
dc.identifier.citationRahlenbeck, M., Sun, G. L., Sun, D. L., Lin, C. T., Keimer, B., & Ulrich, C. (2009). Phonon anomalies in pure and underdoped R1-xKxFe2As2 (R=Ba, Sr) investigated by raman light scattering. Physical Review B, 80(6), 064509. doi:10.1103/PhysRevB.80.064509en_AU
dc.identifier.govdoc1330en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.80.064509en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/2214en_AU
dc.identifier.volume80en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectRaman spectraen_AU
dc.subjectLight scatteringen_AU
dc.subjectPhononsen_AU
dc.subjectSpin wavesen_AU
dc.subjectMagnetic momentsen_AU
dc.subjectAntiferromagnetic materialsen_AU
dc.titlePhonon anomalies in pure and underdoped R1-xKxFe2As2 (R=Ba, Sr) investigated by raman light scatteringen_AU
dc.typeJournal Articleen_AU
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