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

Journal Article · · Cogent Physics
 [1];  [2];  [2]
  1. Univ. of Montevallo, Montevallo, AL (United States). Dept. of Biology, Chemistry and Mathematics; University of Alabama at Birmingham
  2. Univ. of Alabama, Birmingham, AL (United States). Dept. of Physics
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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 (TN) 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 TN at all pressures up to 35 GPa.
Research Organization:
Univ. of Alabama, Birmingham, AL (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; NA0002928
OSTI ID:
1412680
Alternate ID(s):
OSTI ID: 1418042
Journal Information:
Cogent Physics, Journal Name: Cogent Physics Journal Issue: 1 Vol. 4; ISSN 2331-1940
Publisher:
Cogent OACopyright Statement
Country of Publication:
United States
Language:
English

References (10)

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Magnetic ordering temperatures in rare earth metal dysprosium under ultrahigh pressures journal April 2014
Anomalous Thermal Expansion and Magnetostriction of Single-Crystal Dysprosium journal April 1965
Generalized phase diagram for the rare-earth elements: Calculations and correlations of bulk properties journal April 1975
Correlation between d -Band Occupancy and Crystal Structure in the Rare Earths journal March 1977
Some Magnetic and Electrical Properties of Gadolinium, Dysprosium, and Erbium Metals journal January 1953
EXPGUI , a graphical user interface for GSAS journal April 2001

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Related Subjects

36 MATERIALS SCIENCE
High Pressures
Low Temperatures
Magnetic Ordering
Rare Earth Metals
Thermal Expansion