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Title: Near-zero thermal expansion in magnetically ordered state in dysprosium at high pressures and low temperatures

The atomic volume of rare earth metal Dysprosium (Dy) has been measured up to high pressures of 35 GPa and low temperatures between 200 K and 7 K in a diamond anvil cell using angle dispersive x-ray diffraction at a synchrotron source. The hexagonal close-packed (hcp), alpha-Samarium (α-Sm), and double hexagonal close packed (dhcp) phases are observed to be stable in Dy under high-pressure and low-temperature conditions achieved in our experiments. Dy is known to undergo magnetic ordering below 176 K at ambient pressure with magnetic ordering Néel temperature (T N) that changes rapidly with increasing pressure. Our experimental measurement shows that Dy has near-zero thermal expansion in the magnetically ordered state and normal thermal expansion in the paramagnetic state for all the three known high pressure phases (hcp, α-Sm, and dhcp) to 35 GPa. This near-zero thermal expansion behavior in Dy is observed below the magnetic ordering temperature T N at all pressures up to 35 GPa.
 [1] ;  [2] ;  [2]
  1. Univ. of Montevallo, Montevallo, AL (United States). Dept. of Biology, Chemistry and Mathematics
  2. Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics
Publication Date:
Grant/Contract Number:
NA0002928; NA0001974; FG02-99ER45775; AC02-06CH11357
Accepted Manuscript
Journal Name:
Cogent Physics
Additional Journal Information:
Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2331-1940
Cogent OA
Research Org:
Univ. of Alabama, Birmingham, AL (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
36 MATERIALS SCIENCE; Rare Earth Metals; High Pressures; Low Temperatures; Magnetic Ordering; Thermal Expansion
OSTI Identifier: