Magnetic transition temperatures follow crystallographic symmetry in Samarium under high-pressures and low-temperatures
- Univ. of Alabama at Birmingham, Birmingham, AL (United States)
- Saint Augustine's Univ., Raleigh, NC (United States)
Magnetic ordering temperatures in rare earth metal samarium (Sm) have been studied using an ultrasensitive electrical transport measurement technique in a designer diamond anvil cell to high-pressure up to 47 GPa and low-temperature to 10 K. The two magnetic transitions at 106 K and 14 K in the α-Sm phase, attributed to antiferromagnetic ordering on hexagonal and cubic layers respectively, collapse in to one magnetic transition near 10 GPa when Sm assumes a double hexagonal close packed (dhcp) phase. On further increase in pressure above 34 GPa, the magnetic transitions split again as Sm adopts a hexagonal-hP3 structure indicating different magnetic transition temperatures for different crystallographic sites. A model for magnetic ordering for the hexagonal-hP3 phase in samarium has been proposed based on the experimental data. The magnetic transition temperatures closely follow the crystallographic symmetry during α-Sm → dhcp → fcc/dist.fcc → hP3 structure sequence at high-pressures and low-temperatures.
- Research Organization:
- Univ. of Alabama, Birmingham, AL (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- NA0002928; DMR-1460392
- OSTI ID:
- 1334960
- Journal Information:
- Journal of Physics. Condensed Matter, Vol. 29, Issue 6; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
High-pressure structural systematics in samarium up to 222 GPa
|
journal | May 2020 |
High-pressure structural systematics in samarium up to 222 GPa
|
text | January 2020 |
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