Neutron diffraction and electrical transport studies on magnetic ordering in terbium at high pressures and low temperatures

Journal Article · Tue Jun 11 00:00:00 EDT 2013 · High Pressure Research

DOI:https://doi.org/10.1080/08957959.2013.806503· OSTI ID:1251157

Thomas, Sarah A. ^[1]; Montgomery, Jeffrey M. ^[1]; Tsoi, Georgiy M. ^[1]; Vohra, Yogesh K. ^[1]; Chesnut, Gary N. ^[2]; Weir, Samuel T. ^[3]; Tulk, Christopher A. ^[4]; dos Santos, Antonio M. ^[4]

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1. Univ. of Alabama at Birmingham, Birmingham, AL (United States)
2. Univ. of West Georgia, Carrollton, GA (United States)
3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Neutron diffraction and electrical transport measurements have been carried out on the heavy rare earth metal terbium at high pressures and low temperatures in order to elucidate the onset of ferromagnetic order as a function of pressure. The electrical resistance measurements show a change in slope as the temperature is lowered through the ferromagnetic Curie temperature. The temperature of this ferromagnetic transition decreases from approximately 240 K at ambient pressure at a rate of –16.7 K/GPa up to a pressure of 3.6 GPa, at which point the onset of ferromagnetic order is suppressed. Neutron diffraction measurements as a function of pressure at temperatures ranging from 90 K to 290 K confirm that the change of slope in the resistance is associated with the ferromagnetic ordering, since this occurs at pressures similar to those determined from the resistance results at these temperatures. Furthermore, a change in ferromagnetic ordering as the pressure is increased above 3.6 GPa is correlated with the phase transition from the ambient hexagonal close packed (hcp) structure to an α-Sm type structure at high pressures.

• Research Organization: Univ. of Alabama, Birmingham, AL (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0002014
• OSTI ID: 1251157
• Journal Information: High Pressure Research, Vol. 33, Issue 3; ISSN 0895-7959
• Publisher: Taylor & Francis
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
materials under extreme conditions
neutron diffraction
electrical transport
rare-earth metals
magnetism
high pressures-low temperatures