Coincident structural and magnetic order in BaFe2(As1-x Px)2 revealed by high-resolution neutron diffraction

J. M. Allred*, K. M. Taddei, D. E. Bugaris, S. Avci, D. Y. Chung, H. Claus, C. Dela Cruz, M. G. Kanatzidis, S. Rosenkranz, R. Osborn, O. Chmaissem

*Corresponding author for this work

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Abstract

We present neutron diffraction analysis of BaFe2(As1-xPx)2 over a wide temperature (10 to 300 K) and compositional (0.11≤x≤0.79) range, including the normal state, the magnetically ordered state, and the superconducting state. The paramagnetic to spin-density wave and orthorhombic to tetragonal transitions are first order and coincident within the sensitivity of our measurements (∼0.5 K). Extrapolation of the orthorhombic order parameter down to zero suggests that structural quantum criticality cannot exist at compositions higher than x=0.28, which is much lower than values determined using other methods, but in good agreement with our observations of the actual phase stability range. The onset of spin-density wave order shows a stronger structural anomaly than the charge-doped system in the form of an enhancement of the c/a ratio below the transition.

Original languageEnglish (US)
Article number104513
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number10
DOIs
StatePublished - Sep 19 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Allred, J. M., Taddei, K. M., Bugaris, D. E., Avci, S., Chung, D. Y., Claus, H., Dela Cruz, C., Kanatzidis, M. G., Rosenkranz, S., Osborn, R., & Chmaissem, O. (2014). Coincident structural and magnetic order in BaFe2(As1-x Px)2 revealed by high-resolution neutron diffraction. Physical Review B - Condensed Matter and Materials Physics, 90(10), [104513]. https://doi.org/10.1103/PhysRevB.90.104513