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

Vohra, Yogesh K.; Tsoi, Georgiy M.; Johnson, Craig R.

doi:10.1088/1361-648X/29/6/065801

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

Journal Article · Tue Dec 20 23:00:00 EST 2016 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648X/29/6/065801· OSTI ID:1334960

Vohra, Yogesh K. ^[1]; Tsoi, Georgiy M. ^[2]; Johnson, Craig R. ^[3]

Univ. of Alabama at Birmingham, Birmingham, AL (United States); University of Alabama at Birmingham
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 at Birmingham, Birmingham, AL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002928

OSTI ID:: 1334960

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 6 Vol. 29; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

High-pressure structural systematics in samarium up to 222 GPa Finnegan, S. E.; Pace, E. J.; Storm, C. V. Physical Review B, Vol. 101, Issue 17 https://doi.org/10.1103/physrevb.101.174109	journal	May 2020
High-pressure structural systematics in samarium up to 222 GPa Finnegan, S. E.; Pace, E. J.; Storm, C. V. Deutsches Elektronen-Synchrotron, DESY, Hamburg https://doi.org/10.3204/pubdb-2020-02174	text	January 2020