TO(Γ) mode resonances in the rare-earth nitrides

W. F. Holmes-Hewett; R. G. Buckley; T. J. Butler; C. Pot; K. Van Koughnet; B. J. Ruck; H. J. Trodahl

doi:10.1063/5.0098290

AIP Advances (Jul 2022)

TO(Γ) mode resonances in the rare-earth nitrides

W. F. Holmes-Hewett,
R. G. Buckley,
T. J. Butler,
C. Pot,
K. Van Koughnet,
B. J. Ruck,
H. J. Trodahl

Affiliations

W. F. Holmes-Hewett: The MacDiarmid Institute for Advanced Materials and Nanotechnology and The School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
R. G. Buckley: The MacDiarmid Institute for Advanced Materials and Nanotechnology and The Robinson Research Institute, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
T. J. Butler: The MacDiarmid Institute for Advanced Materials and Nanotechnology and The Robinson Research Institute, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
C. Pot: The MacDiarmid Institute for Advanced Materials and Nanotechnology and The School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
K. Van Koughnet: The MacDiarmid Institute for Advanced Materials and Nanotechnology and The School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
B. J. Ruck: The MacDiarmid Institute for Advanced Materials and Nanotechnology and The School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand
H. J. Trodahl: The School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington 6140, New Zealand

DOI: https://doi.org/10.1063/5.0098290
Journal volume & issue: Vol. 12, no. 7
pp. 075120 – 075120-4

Abstract

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Far infrared measurements of the absorption into the IR-active TO(Γ) mode are reported for a selection of the rare-earth mononitrides. The frequencies harden as anticipated by ≈15% as the lattice constant shrinks by ≈6% from SmN to LuN, though they are typically ∼25% softer than the LSDA+U prediction published a decade ago. The data are in much closer agreement with our computation based on more recent software for two in the series: GdN and LuN. The resonances show surprisingly heavy damping, diminishing from the lighter to heavier rare earth elements.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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