Magnetic structure of Nd in NdFeAsO studied by x-ray resonant magnetic scattering

Kim, M. G.; Kim, J. -W.; Yan, J. -Q.; Goldman, A. I.; Kreyssig, A.

doi:10.1103/PhysRevB.100.224401

Title: Magnetic structure of Nd in NdFeAsO studied by x-ray resonant magnetic scattering

Journal Article · 01 December 2019 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.100.224401 · OSTI ID:1607450

^[1]; Kim, J. -W. ^[2];

^[3]; Goldman, A. I. ^[4]; Kreyssig, A. ^[4]

Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy; Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
Ames Lab., and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy

The magnetic structure of Nd in NdFeAsO compound has been explored by x-ray resonant magnetic scattering at the Nd $L_{2}$ edge ( $E = 6.725$ keV) at $1.7 \leq T \leq 15$ K. At $T = 1.7$ K we find that the Nd moments are aligned along the crystallographic $c$ direction with the (1, 0, 0) propagation vector, and are arranged antiferromagnetically along the $a$ direction and ferromagnetically along the $b$ and $c$ directions. At $1.7 < T \leq 15$ K, we observe an unusual temperature dependence of the magnetic Bragg peaks that appear differently at $Q = (h, 0, l)$ and $(0, k, l)$ . From the changes of magnetic intensities and our representation analysis, we find that the Nd moments are reoriented toward the $a$ direction with a gradual decrease of the moment component in the $c$ direction with increasing temperature. We postulate that the reorientation of the Nd moment is due to a strong interplay with the Fe moment which is fully ordered in this temperature range.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Rutgers Univ., Piscataway, NJ (United States); Iowa State Univ., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC02-06CH11357; FG02-07ER46382; AC02-07CH11358

OSTI ID:: 1607450

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 22 Vol. 100; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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