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The temperature dependence of nuclear resonant X-Ray spectra of magnetic iron and cementite

Mauger, L. and Lohaus, S. H. and Fultz, B. (2022) The temperature dependence of nuclear resonant X-Ray spectra of magnetic iron and cementite. Hyperfine Interactions, 243 (1). Art. No. 5. ISSN 0304-3843. doi:10.1007/s10751-021-01750-6.

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From low temperatures through the Curie temperatures, the phonon density of states (DOS) was measured for bcc ⁵⁷Fe, and the partial phonon DOS was measured for cementite, ⁵⁷Fe₃C, by nuclear resonant inelastic x-ray scattering (NRIXS). Nuclear forward scattering (NFS) was used to determine the state of magnetization of ⁵⁷Fe₃C. The changes in phonon DOS with magnetization were assessed, and a linear relationship was found between the temperature dependences of the magnetization and the non-quasiharmonic shifts of phonon frequencies. Following the quasiharmonic approximation (QHA) for non-harmonic phonons, a magnetic quasiharmonic theory is developed to account for how phonon frequencies are altered by changes in magnetization. The formalism explains well the discrepancy between the free energy measurements and predictions of the QHA for both bcc iron and cementite. The physical origin of the magnetic Grüneisen parameters remains a challenge.

Item Type:Article
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URLURL TypeDescription ReadCube access
Lohaus, S. H.0000-0002-4430-3834
Fultz, B.0000-0002-6364-8782
Additional Information:© The Author(s), under exclusive licence to Springer Nature Switzerland AG 2021. Accepted 21 October 2021; Published 30 December 2021. For help with the experiments and their analysis, the authors thank our present and former Caltech colleagues P. Guzman, C. Bernal, M. S. Lucas, C. N. Saunders, J. A. Muñoz, S. J. Tracy, M. Kresch, J. E. Herriman and O. Hellman, and our colleagues at the Advanced Photon Source E. E. Alp, W. Sturhahn, Y. Xiao and P. Chow. We thank J. Li, U. Michigan, for providing the sample of ⁵⁷Fe₃C. These authors contributed equally to this work. This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2021), 5-10 September 2021, Brasov, Romania. Edited by Victor Kuncser. This work was supported by the U.S. National Science Foundation under Grant No. 1904714. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility, operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC02-06CH11357
Subject Keywords:Phonons; Magnetism; Nuclear resonant scattering
Issue or Number:1
Record Number:CaltechAUTHORS:20220131-281001800
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Official Citation:Mauger, L., Lohaus, S.H. & Fultz, B. The temperature dependence of nuclear resonant X-Ray spectra of magnetic iron and cementite. Hyperfine Interact 243, 5 (2022).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113167
Deposited By: Tony Diaz
Deposited On:01 Feb 2022 18:05
Last Modified:01 Feb 2022 18:05

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