High pressure neutron diffraction study of magnetic ordering in erbium

Matthew P. Clay; Raimundas Sereika; Maurissa K. Higgins; Antonio M. dos Santos; Jamie J. Molaison; Yogesh K. Vohra

doi:10.1016/j.jmmm.2024.172066

High pressure neutron diffraction study of magnetic ordering in erbium

Matthew P. Clay
, Raimundas Sereika
, Maurissa K. Higgins
, Antonio M. dos Santos
, Jamie J. Molaison
, Yogesh K. Vohra

Research output: Contribution to journal › Article › peer-review

Abstract

We have studied magnetic ordering in polycrystalline erbium at high pressures up to 32 GPa and low temperatures down to 10 K using neutron diffraction techniques at the Spallation Neutron Source at Oak Ridge National Laboratory, USA. For the hexagonal close-packed (hcp) phase, strong nuclear and magnetic satellite intensities permit a simultaneous refinement of the nuclear and magnetic structures. At 1 GPa of applied pressure, a modulation vector q=γc^∗ with γ≈2/7 for the c-axis modulated and cycloidal phases is consistent with prior single-crystal studies at low pressures. At 6.7 GPa in the hcp phase, we find γ≈0.31, indicating a reduction in the period of the magnetic structure with respect to the crystal lattice. The magnetic ordering temperature at 6.7 GPa is slightly above 60 K. At 32 GPa in the double hexagonal close-packed phase, the magnetic scattering constrains the magnetic ordering temperature to 25±5 K. Our neutron diffraction study demonstrates that the magnetic ordering persists in the high-pressure double hexagonal close-packed phase of erbium to the highest pressure of 32 GPa.

Original language	English
Article number	172066
Journal	Journal of Magnetism and Magnetic Materials
Volume	598
DOIs	https://doi.org/10.1016/j.jmmm.2024.172066
State	Published - May 15 2024

Funding

This material is based upon work supported by the Department of Energy-Basic Energy Sciences under Award Number DE-SC0023268. The Physical Properties Measurements System (PPMS) employed in this study was acquired under NSF MRI Grant No. 2215143. This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. Maurissa Higgins acknowledges support from the NSF Research Experiences for Undergraduates (REU)-site under Award Number DMR-2148897. Matthew Clay would like to thank Dr. S. A. Calder for his helpful suggestions about conducting magnetic structure refinements with FullProf. This material is based upon work supported by the Department of Energy - Basic Energy Sciences under Award Number DE-SC0023268 . This research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory . Maurissa Higgins acknowledges support from the NSF Research Experiences for Undergraduates (REU)-site under Award Number DMR-2148897 . Matthew Clay would like to thank Dr. S. A. Calder for his helpful suggestions about conducting magnetic structure refinements with FullProf.

Keywords

High-Pressures
Lanthanides
Magnetic Structures
Phase transitions
Spallation Neutrons

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10.1016/j.jmmm.2024.172066

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title = "High pressure neutron diffraction study of magnetic ordering in erbium",

abstract = "We have studied magnetic ordering in polycrystalline erbium at high pressures up to 32 GPa and low temperatures down to 10 K using neutron diffraction techniques at the Spallation Neutron Source at Oak Ridge National Laboratory, USA. For the hexagonal close-packed (hcp) phase, strong nuclear and magnetic satellite intensities permit a simultaneous refinement of the nuclear and magnetic structures. At 1 GPa of applied pressure, a modulation vector q=γc∗ with γ≈2/7 for the c-axis modulated and cycloidal phases is consistent with prior single-crystal studies at low pressures. At 6.7 GPa in the hcp phase, we find γ≈0.31, indicating a reduction in the period of the magnetic structure with respect to the crystal lattice. The magnetic ordering temperature at 6.7 GPa is slightly above 60 K. At 32 GPa in the double hexagonal close-packed phase, the magnetic scattering constrains the magnetic ordering temperature to 25±5 K. Our neutron diffraction study demonstrates that the magnetic ordering persists in the high-pressure double hexagonal close-packed phase of erbium to the highest pressure of 32 GPa.",

keywords = "High-Pressures, Lanthanides, Magnetic Structures, Phase transitions, Spallation Neutrons",

author = "Clay, \{Matthew P.\} and Raimundas Sereika and Higgins, \{Maurissa K.\} and \{dos Santos\}, \{Antonio M.\} and Molaison, \{Jamie J.\} and Vohra, \{Yogesh K.\}",

note = "Publisher Copyright: {\textcopyright} 2024 The Authors",

year = "2024",

month = may,

day = "15",

doi = "10.1016/j.jmmm.2024.172066",

language = "English",

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journal = "Journal of Magnetism and Magnetic Materials",

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T1 - High pressure neutron diffraction study of magnetic ordering in erbium

AU - Clay, Matthew P.

AU - Sereika, Raimundas

AU - Higgins, Maurissa K.

AU - dos Santos, Antonio M.

AU - Molaison, Jamie J.

AU - Vohra, Yogesh K.

PY - 2024/5/15

Y1 - 2024/5/15

N2 - We have studied magnetic ordering in polycrystalline erbium at high pressures up to 32 GPa and low temperatures down to 10 K using neutron diffraction techniques at the Spallation Neutron Source at Oak Ridge National Laboratory, USA. For the hexagonal close-packed (hcp) phase, strong nuclear and magnetic satellite intensities permit a simultaneous refinement of the nuclear and magnetic structures. At 1 GPa of applied pressure, a modulation vector q=γc∗ with γ≈2/7 for the c-axis modulated and cycloidal phases is consistent with prior single-crystal studies at low pressures. At 6.7 GPa in the hcp phase, we find γ≈0.31, indicating a reduction in the period of the magnetic structure with respect to the crystal lattice. The magnetic ordering temperature at 6.7 GPa is slightly above 60 K. At 32 GPa in the double hexagonal close-packed phase, the magnetic scattering constrains the magnetic ordering temperature to 25±5 K. Our neutron diffraction study demonstrates that the magnetic ordering persists in the high-pressure double hexagonal close-packed phase of erbium to the highest pressure of 32 GPa.

AB - We have studied magnetic ordering in polycrystalline erbium at high pressures up to 32 GPa and low temperatures down to 10 K using neutron diffraction techniques at the Spallation Neutron Source at Oak Ridge National Laboratory, USA. For the hexagonal close-packed (hcp) phase, strong nuclear and magnetic satellite intensities permit a simultaneous refinement of the nuclear and magnetic structures. At 1 GPa of applied pressure, a modulation vector q=γc∗ with γ≈2/7 for the c-axis modulated and cycloidal phases is consistent with prior single-crystal studies at low pressures. At 6.7 GPa in the hcp phase, we find γ≈0.31, indicating a reduction in the period of the magnetic structure with respect to the crystal lattice. The magnetic ordering temperature at 6.7 GPa is slightly above 60 K. At 32 GPa in the double hexagonal close-packed phase, the magnetic scattering constrains the magnetic ordering temperature to 25±5 K. Our neutron diffraction study demonstrates that the magnetic ordering persists in the high-pressure double hexagonal close-packed phase of erbium to the highest pressure of 32 GPa.

KW - High-Pressures

KW - Lanthanides

KW - Magnetic Structures

KW - Phase transitions

KW - Spallation Neutrons

UR - https://www.scopus.com/pages/publications/85190896910

U2 - 10.1016/j.jmmm.2024.172066

DO - 10.1016/j.jmmm.2024.172066

M3 - Article

AN - SCOPUS:85190896910

SN - 0304-8853

VL - 598

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

M1 - 172066

ER -

High pressure neutron diffraction study of magnetic ordering in erbium

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