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Title: Magnetic transition temperatures follow crystallographic symmetry in Samarium under high-pressures and low-temperatures

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.
Authors:
 [1] ;  [1] ;  [2]
  1. Univ. of Alabama at Birmingham, Birmingham, AL (United States)
  2. Saint Augustine's Univ., Raleigh, NC (United States)
Publication Date:
Grant/Contract Number:
NA0002928; DMR-1460392
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 29; Journal Issue: 6; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Research Org:
Univ. of Alabama at Birmingham, Birmingham, AL (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Rare Earth Metals; high pressures; low temperatures; magnetic ordering
OSTI Identifier:
1334960

Vohra, Yogesh K., Tsoi, Georgiy M., and Johnson, Craig R.. Magnetic transition temperatures follow crystallographic symmetry in Samarium under high-pressures and low-temperatures. United States: N. p., Web. doi:10.1088/1361-648X/29/6/065801.
Vohra, Yogesh K., Tsoi, Georgiy M., & Johnson, Craig R.. Magnetic transition temperatures follow crystallographic symmetry in Samarium under high-pressures and low-temperatures. United States. doi:10.1088/1361-648X/29/6/065801.
Vohra, Yogesh K., Tsoi, Georgiy M., and Johnson, Craig R.. 2016. "Magnetic transition temperatures follow crystallographic symmetry in Samarium under high-pressures and low-temperatures". United States. doi:10.1088/1361-648X/29/6/065801. https://www.osti.gov/servlets/purl/1334960.
@article{osti_1334960,
title = {Magnetic transition temperatures follow crystallographic symmetry in Samarium under high-pressures and low-temperatures},
author = {Vohra, Yogesh K. and Tsoi, Georgiy M. and Johnson, Craig R.},
abstractNote = {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.},
doi = {10.1088/1361-648X/29/6/065801},
journal = {Journal of Physics. Condensed Matter},
number = 6,
volume = 29,
place = {United States},
year = {2016},
month = {12}
}