Magnetic ordering and structural distortion in a PrFeAsO single crystal studied by neutron and X-ray scattering

Kim, M.G. and Ratcliff, W. and Pajerowski, D.M. and Kim, J.-W. and Yan, J.-Q. and Lynn, J.W. and Goldman, A.I. and Kreyssig, A.

Volume: 103 Pages:
DOI: 10.1103/PhysRevB.103.174405
Published: 2021

We report the magnetic ordering and structural distortion in PrFeAsO crystals, the basis compound for one of the oxypnictide superconductors, using high-resolution X-ray diffraction, neutron diffraction, and X-ray resonant magnetic scattering (XRMS). We find the structural tetragonal-to-orthorhombic phase transition at TS=147K, the AFM phase transition of the Fe moments at TFe=72K, and the Pr AFM phase transition at TPr=21K. Combined high-resolution neutron diffraction and XRMS show unambiguously that the Pr moments point parallel to the longer orthorhombic a axis and order antiferromagnetically along the a axis but ferromagnetically along the b and c directions in the stripelike AFM order. The temperature-dependent magnetic order parameter of the Pr moments shows no evidence for a reorientation of moments. © 2021 American Physical Society.

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