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Structural and magnetic phase transitions near optimal superconductivity in BaFe2(As1−xPx)2

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DOIResolve DOI: https://doi.org/10.1103/PhysRevLett.114.157002
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Affiliation
  1. National Research Council of Canada. Security and Disruptive Technologies
FormatText, Article
Abstract
We use nuclear magnetic resonance (NMR), high-resolution x-ray, and neutron scattering studies to study structural and magnetic phase transitions in phosphorus-doped BaFe2(As1−xPx)2. Previous transport, NMR, specific heat, and magnetic penetration depth measurements have provided compelling evidence for the presence of a quantum critical point (QCP) near optimal superconductivity at x=0.3. However, we show that the tetragonal-to-orthorhombic structural (Ts) and paramagnetic to antiferromagnetic (AF, TN) transitions in BaFe2(As1−xPx)2 are always coupled and approach TN≈Ts≥Tc (≈29  K) for x=0.29 before vanishing abruptly for x≥0.3. These results suggest that AF order in BaFe2(As1−xPx)2 disappears in a weakly first-order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.
Publication date
PublisherAmerican Physical Society
In
  • Physical Review Letters 114, no. 15: 157002-1–157002-5.
LanguageEnglish
Peer reviewedYes
NPARC number23001611
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Record identifierb67f53ef-f21e-4d15-9838-e5f72047bcf4
Record created2017-03-10
Record modified2020-05-30
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