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Title: Magnetic phase diagram of ε ' -FeH

Abstract

Iron hydrides attract significant interest as candidates for the main constituents of the Earth's core in geophysics and planetary science. However, their basic physical properties are still not well known. Here, we combined high-pressure transport, synchrotron radiation Mossbauer, and Fe K β x-ray emission spectroscopy measurements on ε'-FeH to map out a detailed magnetic phase diagram of this hydride phase of iron. In contrast to our original expectations, we found two magnetic phase transitions at high pressure due to two inequivalent iron sites existing in the ε'-FeH structure. Our results account for the previous large pressure difference on the loss of ferromagnetism between experiment and theoretical calculations. Finally, the discovery of an unexpected complex magnetic phase diagram in ε'-FeH has implications for a better understanding of the magnetic and physical properties of the iron-hydrogen compounds, important for the conditions of planetary interiors.

Authors:
ORCiD logo [1];  [2];  [3];  [2];  [4];  [4];  [4];  [5]
  1. Univ. of Science and Technology of China, Hefei (China); Carnegie Inst. of Washington, Washington, DC (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Univ. of Illinois at Urbana-Champaign, IL (United States); Univ. of Alabama, Birmingham, AL (United States)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Carnegie Inst. of Washington, Washington, DC (United States); Center for High Pressure Science and Technology Advanced Research, Shanghai (China)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1614789
Grant/Contract Number:  
AC02-06CH11357; NA0001974; FG02-99ER45775; EAR-160685
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 101; Journal Issue: 2; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; geophysics; magnetic phase transitions; magnetism; phase diagrams; pressure effects; hydrides; transition metals; Mossbauer spectroscopy; resistivity measurements; X-ray emission spectroscopy

Citation Formats

Ying, Jianjun, Zhao, Jiyong, Bi, Wenli, Alp, E. Ercan, Xiao, Yuming, Chow, Paul, Shen, Guoyin, and Struzhkin, Viktor V. Magnetic phase diagram of ε'-FeH. United States: N. p., 2020. Web. https://doi.org/10.1103/PhysRevB.101.020405.
Ying, Jianjun, Zhao, Jiyong, Bi, Wenli, Alp, E. Ercan, Xiao, Yuming, Chow, Paul, Shen, Guoyin, & Struzhkin, Viktor V. Magnetic phase diagram of ε'-FeH. United States. https://doi.org/10.1103/PhysRevB.101.020405
Ying, Jianjun, Zhao, Jiyong, Bi, Wenli, Alp, E. Ercan, Xiao, Yuming, Chow, Paul, Shen, Guoyin, and Struzhkin, Viktor V. Tue . "Magnetic phase diagram of ε'-FeH". United States. https://doi.org/10.1103/PhysRevB.101.020405. https://www.osti.gov/servlets/purl/1614789.
@article{osti_1614789,
title = {Magnetic phase diagram of ε'-FeH},
author = {Ying, Jianjun and Zhao, Jiyong and Bi, Wenli and Alp, E. Ercan and Xiao, Yuming and Chow, Paul and Shen, Guoyin and Struzhkin, Viktor V.},
abstractNote = {Iron hydrides attract significant interest as candidates for the main constituents of the Earth's core in geophysics and planetary science. However, their basic physical properties are still not well known. Here, we combined high-pressure transport, synchrotron radiation Mossbauer, and Fe K β x-ray emission spectroscopy measurements on ε'-FeH to map out a detailed magnetic phase diagram of this hydride phase of iron. In contrast to our original expectations, we found two magnetic phase transitions at high pressure due to two inequivalent iron sites existing in the ε'-FeH structure. Our results account for the previous large pressure difference on the loss of ferromagnetism between experiment and theoretical calculations. Finally, the discovery of an unexpected complex magnetic phase diagram in ε'-FeH has implications for a better understanding of the magnetic and physical properties of the iron-hydrogen compounds, important for the conditions of planetary interiors.},
doi = {10.1103/PhysRevB.101.020405},
journal = {Physical Review B},
number = 2,
volume = 101,
place = {United States},
year = {2020},
month = {1}
}

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