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Title: Neutron diffraction study of magnetic ordering in high pressure phases of rare earth metal holmium

Abstract

The magnetic ordering in rare earth metals is well established for ambient pressure crystal structures, however, little is known about the magnetic ordering in their corresponding high-pressure crystalline modifications. Holmium (Ho) was studied in a large-volume diamond anvil cell at the Spallation Neutron Source to high-pressure up to 20 GPa and to low-temperature to 10 K. We have conducted two independent high-pressure low-temperature experiments under non-hydrostatic and quasi-hydrostatic pressure conditions respectively. The ambient pressure hexagonal close packed (hcp) phase of holmium shows two magnetic transitions below 10 GPa one to an incommensurate Antiferromagnetic (AFM) phase and another to a conical-Ferromagnetic (c-FM) phase. In contrast, alpha-Samarium-type (α-Sm) phase above 10 GPa and the double hexagonal close packed (dhcp) phase above 19 GPa show only one FM transition marked by the appearance of a magnetic peak at 3 Å and the concurrent enhancement of nuclear peaks below 30 K. Finally, these new transitions observed by neutron diffraction can be accounted by a commensurate superlattice formation along c-axis in both the α-Sm-type phase and the dhcp phase.

Authors:
 [1];  [1];  [2];  [2]
  1. Univ. of Alabama, Birmingham, AL (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Univ. of Alabama, Birmingham, AL (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1607351
Alternate Identifier(s):
OSTI ID: 1608146
Grant/Contract Number:  
NA0003916; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Magnetism and Magnetic Materials
Additional Journal Information:
Journal Volume: 507; Journal Issue: C; Journal ID: ISSN 0304-8853
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; neutron diffraction; high pressure; rare earth metals; magnetic transitions

Citation Formats

Perreault, Christopher S., Vohra, Yogesh K., dos Santos, Antonio M., and Molaison, Jamie J. Neutron diffraction study of magnetic ordering in high pressure phases of rare earth metal holmium. United States: N. p., 2020. Web. doi:10.1016/j.jmmm.2020.166843.
Perreault, Christopher S., Vohra, Yogesh K., dos Santos, Antonio M., & Molaison, Jamie J. Neutron diffraction study of magnetic ordering in high pressure phases of rare earth metal holmium. United States. doi:10.1016/j.jmmm.2020.166843.
Perreault, Christopher S., Vohra, Yogesh K., dos Santos, Antonio M., and Molaison, Jamie J. Sun . "Neutron diffraction study of magnetic ordering in high pressure phases of rare earth metal holmium". United States. doi:10.1016/j.jmmm.2020.166843.
@article{osti_1607351,
title = {Neutron diffraction study of magnetic ordering in high pressure phases of rare earth metal holmium},
author = {Perreault, Christopher S. and Vohra, Yogesh K. and dos Santos, Antonio M. and Molaison, Jamie J.},
abstractNote = {The magnetic ordering in rare earth metals is well established for ambient pressure crystal structures, however, little is known about the magnetic ordering in their corresponding high-pressure crystalline modifications. Holmium (Ho) was studied in a large-volume diamond anvil cell at the Spallation Neutron Source to high-pressure up to 20 GPa and to low-temperature to 10 K. We have conducted two independent high-pressure low-temperature experiments under non-hydrostatic and quasi-hydrostatic pressure conditions respectively. The ambient pressure hexagonal close packed (hcp) phase of holmium shows two magnetic transitions below 10 GPa one to an incommensurate Antiferromagnetic (AFM) phase and another to a conical-Ferromagnetic (c-FM) phase. In contrast, alpha-Samarium-type (α-Sm) phase above 10 GPa and the double hexagonal close packed (dhcp) phase above 19 GPa show only one FM transition marked by the appearance of a magnetic peak at 3 Å and the concurrent enhancement of nuclear peaks below 30 K. Finally, these new transitions observed by neutron diffraction can be accounted by a commensurate superlattice formation along c-axis in both the α-Sm-type phase and the dhcp phase.},
doi = {10.1016/j.jmmm.2020.166843},
journal = {Journal of Magnetism and Magnetic Materials},
issn = {0304-8853},
number = C,
volume = 507,
place = {United States},
year = {2020},
month = {3}
}

Journal Article:
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