The relation between local structural distortion and the low-temperature magnetic anomaly in Fe7S8

D. Koulialias*, E. Canévet, M. Charilaou, P. G. Weidler, J. F. Löffler, A. U. Gehring

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Structural defects on an atomic level can crucially impact the magnetic properties of a material. We study this phenomenon by means of magnetometry and powder neutron diffraction on a stoichiometric, monoclinic pyrrhotite (Fe7S8), which is a classic omission structure with a magnetic anomaly at about 30 K. The initial structural distortion of the pyrrhotite at 300 K caused by the vacancy arrangement decreases upon cooling, and simultaneous to the magnetic anomaly the anisotropic contraction of the unit cell homogenizes the covalency of the Fe-Fe bonds with lengths less than 3.0 Å and the Fe-S-Fe bond angles. These changes on the atomic level affect the spin-orbit coupling and the super-exchange interactions in Fe7S8, and trigger the low-temperature magnetic anomaly within a crystallographically stable system.

Original languageEnglish
Article number425803
JournalJournal of Physics Condensed Matter
Volume30
Issue number42
Number of pages8
ISSN0953-8984
DOIs
Publication statusPublished - 2018

Keywords

  • Exchange interactions
  • Magnetic anisotropy
  • Monoclinic pyrrhotite
  • Spin orbit coupling
  • Vacancies

Cite this

Koulialias, D., Canévet, E., Charilaou, M., Weidler, P. G., Löffler, J. F., & Gehring, A. U. (2018). The relation between local structural distortion and the low-temperature magnetic anomaly in Fe7S8. Journal of Physics Condensed Matter, 30(42), [425803]. https://doi.org/10.1088/1361-648X/aadf54
Koulialias, D. ; Canévet, E. ; Charilaou, M. ; Weidler, P. G. ; Löffler, J. F. ; Gehring, A. U. / The relation between local structural distortion and the low-temperature magnetic anomaly in Fe7S8. In: Journal of Physics Condensed Matter. 2018 ; Vol. 30, No. 42.
@article{9275b6c39d474b9c867721b56309c810,
title = "The relation between local structural distortion and the low-temperature magnetic anomaly in Fe7S8",
abstract = "Structural defects on an atomic level can crucially impact the magnetic properties of a material. We study this phenomenon by means of magnetometry and powder neutron diffraction on a stoichiometric, monoclinic pyrrhotite (Fe7S8), which is a classic omission structure with a magnetic anomaly at about 30 K. The initial structural distortion of the pyrrhotite at 300 K caused by the vacancy arrangement decreases upon cooling, and simultaneous to the magnetic anomaly the anisotropic contraction of the unit cell homogenizes the covalency of the Fe-Fe bonds with lengths less than 3.0 {\AA} and the Fe-S-Fe bond angles. These changes on the atomic level affect the spin-orbit coupling and the super-exchange interactions in Fe7S8, and trigger the low-temperature magnetic anomaly within a crystallographically stable system.",
keywords = "Exchange interactions, Magnetic anisotropy, Monoclinic pyrrhotite, Spin orbit coupling, Vacancies",
author = "D. Koulialias and E. Can{\'e}vet and M. Charilaou and Weidler, {P. G.} and L{\"o}ffler, {J. F.} and Gehring, {A. U.}",
year = "2018",
doi = "10.1088/1361-648X/aadf54",
language = "English",
volume = "30",
journal = "Journal of Physics: Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing",
number = "42",

}

Koulialias, D, Canévet, E, Charilaou, M, Weidler, PG, Löffler, JF & Gehring, AU 2018, 'The relation between local structural distortion and the low-temperature magnetic anomaly in Fe7S8', Journal of Physics Condensed Matter, vol. 30, no. 42, 425803. https://doi.org/10.1088/1361-648X/aadf54

The relation between local structural distortion and the low-temperature magnetic anomaly in Fe7S8. / Koulialias, D.; Canévet, E.; Charilaou, M.; Weidler, P. G.; Löffler, J. F.; Gehring, A. U.

In: Journal of Physics Condensed Matter, Vol. 30, No. 42, 425803, 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The relation between local structural distortion and the low-temperature magnetic anomaly in Fe7S8

AU - Koulialias, D.

AU - Canévet, E.

AU - Charilaou, M.

AU - Weidler, P. G.

AU - Löffler, J. F.

AU - Gehring, A. U.

PY - 2018

Y1 - 2018

N2 - Structural defects on an atomic level can crucially impact the magnetic properties of a material. We study this phenomenon by means of magnetometry and powder neutron diffraction on a stoichiometric, monoclinic pyrrhotite (Fe7S8), which is a classic omission structure with a magnetic anomaly at about 30 K. The initial structural distortion of the pyrrhotite at 300 K caused by the vacancy arrangement decreases upon cooling, and simultaneous to the magnetic anomaly the anisotropic contraction of the unit cell homogenizes the covalency of the Fe-Fe bonds with lengths less than 3.0 Å and the Fe-S-Fe bond angles. These changes on the atomic level affect the spin-orbit coupling and the super-exchange interactions in Fe7S8, and trigger the low-temperature magnetic anomaly within a crystallographically stable system.

AB - Structural defects on an atomic level can crucially impact the magnetic properties of a material. We study this phenomenon by means of magnetometry and powder neutron diffraction on a stoichiometric, monoclinic pyrrhotite (Fe7S8), which is a classic omission structure with a magnetic anomaly at about 30 K. The initial structural distortion of the pyrrhotite at 300 K caused by the vacancy arrangement decreases upon cooling, and simultaneous to the magnetic anomaly the anisotropic contraction of the unit cell homogenizes the covalency of the Fe-Fe bonds with lengths less than 3.0 Å and the Fe-S-Fe bond angles. These changes on the atomic level affect the spin-orbit coupling and the super-exchange interactions in Fe7S8, and trigger the low-temperature magnetic anomaly within a crystallographically stable system.

KW - Exchange interactions

KW - Magnetic anisotropy

KW - Monoclinic pyrrhotite

KW - Spin orbit coupling

KW - Vacancies

U2 - 10.1088/1361-648X/aadf54

DO - 10.1088/1361-648X/aadf54

M3 - Journal article

VL - 30

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

IS - 42

M1 - 425803

ER -