Electron doping evolution of the anisotropic spin excitations in BaFe(2-x)NixAs2

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dc.contributor.authorLuo, HQen_AU
dc.contributor.authorYamani, Zen_AU
dc.contributor.authorChen, YCen_AU
dc.contributor.authorLu, XYen_AU
dc.contributor.authorWang, Men_AU
dc.contributor.authorLi, SLen_AU
dc.contributor.authorMaier, TAen_AU
dc.contributor.authorDanilkin, SAen_AU
dc.contributor.authorAdroja, DTen_AU
dc.contributor.authorDai, PCen_AU
dc.date.accessioned2014-04-11T02:30:09Zen_AU
dc.date.available2014-04-11T02:30:09Zen_AU
dc.date.issued2012-07-10en_AU
dc.date.statistics2014-04-11en_AU
dc.description.abstractWe use inelastic neutron scattering to systematically investigate the Ni-doping evolution of the low-energy spin excitations in BaFe(2-x)NixAs2 spanning from underdoped antiferromagnet to overdoped superconductor (0.03 <= x <= 0.18). In the undoped state, BaFe2As2 changes from paramagnetic tetragonal phase to orthorhombic antiferromagnetic (AF) phase below about 138 K, where the low-energy (<=similar to 80 meV) spin waves form transversely elongated ellipses in the [H, K] plane of the reciprocal space. Upon Ni doping to suppress the static AF order and induce superconductivity, the c-axis magnetic exchange coupling is rapidly suppressed and the momentum distribution of spin excitations in the [H, K] plane is enlarged in both the transverse and longitudinal directions with respect to the in-plane AF ordering wave vector of the parent compound. As a function of increasing Ni-doping x, the spin excitation widths increase linearly but with a larger rate along the transverse direction. These results are in general agreement with calculations of dynamic susceptibility based on the random phase approximation (RPA) in an itinerant electron picture. For samples near optimal superconductivity at x approximate to 0.1, a neutron spin resonance appears in the superconducting state. Upon further increasing the electron doping to decrease the superconducting transition temperature T-c, the intensity of the low-energy magnetic scattering decreases and vanishes concurrently with vanishing superconductivity in the overdoped side of the superconducting dome. Comparing with the low-energy spin excitations centered at commensurate AF positions for underdoped and optimally doped materials (x <= 0.1), spin excitations in the overdoped side (x = 0.15) form transversely incommensurate spin excitations, consistent with the RPA calculation. Therefore, the itinerant electron approach provides a reasonable description to the low-energy AF spin excitations in BaFe(2-x)NixAs2. © 2012, American Physical Society.en_AU
dc.identifier.articlenumber024508en_AU
dc.identifier.citationLuo, H., Yamani, Z., Chen, Y., Lu, X., Wang, M., Li, S., Maier, T. A., Danilkin, S., Adroja, D. T., & Dai, P. (2012). Electron doping evolution of the anisotropic spin excitations in BaFe(2-x)NixAs2. Physical Review B, 86(2), 024508. doi:10.1103/PhysRevB.86.024508en_AU
dc.identifier.govdoc4650en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.86.024508en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5419en_AU
dc.identifier.volume86en_AU
dc.language.isoenen_AU
dc.publisherAmerical Physical Societyen_AU
dc.subjectSuperconductivityen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectSpinen_AU
dc.subjectTetragonal latticesen_AU
dc.subjectRandom phase approximationen_AU
dc.subjectNeutronsen_AU
dc.titleElectron doping evolution of the anisotropic spin excitations in BaFe(2-x)NixAs2en_AU
dc.typeJournal Articleen_AU
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