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Title: Magnetic phase diagram of ε' -FeH

Journal Article · · Physical Review B
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)
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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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-06CH11357; FG02-99ER45775; NA0001974
OSTI ID:
1614789
Journal Information:
Physical Review B, Journal Name: Physical Review B Journal Issue: 2 Vol. 101; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Mossbauer spectroscopy
X-ray emission spectroscopy
geophysics
hydrides
magnetic phase transitions
magnetism
phase diagrams
pressure effects
resistivity measurements
transition metals