Avoided quantum criticality and magnetoelastic coupling in BaFe 2-xNixAs2

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.110.257001
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TypeArticle
Journal titlePhysical Review Letters
ISSN0031-9007
Volume110
Issue25
Article number257001
SubjectAntiferromagnetics; Magnetoelastic couplings; Quantum critical points; Quantum criticality; Superconducting state; Synchrotron x rays; Temperature separation; Zero temperatures; Antiferromagnetism; Separation; Superconductivity; Nickel
AbstractWe study the structural and magnetic orders in electron-doped BaFe 2-xNixAs2 by high-resolution synchrotron x-ray and neutron scatterings. Upon Ni doping x, the nearly simultaneous tetragonal-to-orthorhombic structural (Ts) and antiferromagnetic (TN) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in Ts>TN with increasing x, as was previously observed. However, the temperature separation between Ts and TN decreases with increasing x for x≥0.065, tending toward a quantum bicritical point near optimal superconductivity at x≈0.1. The zero-temperature transition is preempted by the formation of a secondary incommensurate magnetic phase in the region 0.0882;0.104, resulting in a finite value of TN≈Tc+10 K above the superconducting dome around x≈0.1. Our results imply an avoided quantum critical point, which is expected to strongly influence the properties of both the normal and superconducting states. © 2013 American Physical Society.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Canadian Neutron Beam Centre (CNBC-CCFN)
Peer reviewedYes
NPARC number21269888
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Record identifierba14c6ec-f12b-44d0-a299-be0d47963905
Record created2013-12-13
Record modified2016-05-09
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