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Proximity of Iron Pnictide Superconductors to a Quantum Tricritical Point

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arxiv 1009.0009 v1 pith:T2KKA7JJ submitted 2010-08-31 cond-mat.supr-con cond-mat.str-el

G. Giovannetti , C. Ortix , M. Marsman , M. Capone , J. van den Brink , J. Lorenzana This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords pointquantumnatureordertricriticalanalysiscalculationschanges
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We determine the nature of the magnetic quantum critical point in the doped LaFeAsO using a set of constrained density functional calculations that provide ab initio coefficients for a Landau order parameter analysis. The system turns out to be remarkably close to a quantum tricritical point, where the nature of the phase transition changes from first to second order. We compare with the effective field theory and discuss the experimental consequences.

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