Neutron scattering study of underdoped Ba(1-x)KxFe2As2 (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point

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dc.contributor.authorRotundu, CRen_AU
dc.contributor.authorTian, Wen_AU
dc.contributor.authorRule, KCen_AU
dc.contributor.authorForrest, TRen_AU
dc.contributor.authorZhao, Jen_AU
dc.contributor.authorZarestky, JLen_AU
dc.contributor.authorBirgeneau, RJen_AU
dc.date.accessioned2014-04-02T01:23:15Zen_AU
dc.date.available2014-04-02T01:23:15Zen_AU
dc.date.issued2012-04-04en_AU
dc.date.statistics2014-04-02en_AU
dc.description.abstractWe present a combination of elastic neutron scattering measurements in zero and 14.5 T and magnetization measurements in zero and 14 T on underdoped superconducting Ba(1-x)KxFe2As2 (x=0.09 and 0.17), and the same measurements in zero field on a nonsuperconducting crystal with x = 0.09. The data suggest that the underdoped materials may not be electronic phase separated but rather have slightly inhomogeneous potassium doping. The temperature dependence of the magnetic order parameter below the transition of the sample with x = 0.09 is more gradual than that for the case of the undoped BaFe2As2, suggesting that this doping may be in the vicinity of a tricritical point. We advance therefore the hypothesis that the tricritical point is a common feature of all superconducting 122s. For the x = 0.17 sample, while T-c is suppressed from approximate to 17 to approximate to 8 K by a magnetic field of 14 T, the intensity of the magnetic Bragg peaks (1 0 3) at 1.2 K is enhanced by 10%, showing competition of superconductivity and antiferromagnetism. The intensity of the magnetic Bragg peaks (1 0 3) in the (T-c, T-N) temperature interval remain practically unchanged in 14.5 T within a 10% statistical error. The present results are discussed in the context of the existing literature. © 2012, American Physical Society.en_AU
dc.identifier.articlenumber144506en_AU
dc.identifier.citationRotundu, C. R., Tian, W., Rule, K. C., Forrest, T. R., Zhao, J., Zarestky, J. L., & Birgeneau, R. J. (2012). Neutron scattering study of underdoped Ba(1-x)KxFe2As2 (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical point. Physical Review B, 85(14), 1-6, 144506. doi:10.1103/PhysRevB.85.144506en_AU
dc.identifier.govdoc4624en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue14en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.pagination1-6en_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.85.144506en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5380en_AU
dc.identifier.volume85en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectNeutronsen_AU
dc.subjectCrystalsen_AU
dc.subjectSuperconductivityen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectMagnetismen_AU
dc.subjectPotassiumen_AU
dc.titleNeutron scattering study of underdoped Ba(1-x)KxFe2As2 (x=0.09 and 0.17) self-flux-grown single crystals and the universality of the tricritical pointen_AU
dc.typeJournal Articleen_AU
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