Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory

Nagakubo, A.; Lee, H. T.; Ogi, H.; Moriyama, T.; Ono, T.

doi:https://doi.org/10.1063/1.5131768

Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory

Nagakubo, A.; Lee, H. T.; Ogi, H. et al.

Applied Physics Letters, 2020, 116(2), 021901-1-021901-5

Number of Access:729（2025-07-22 20:08 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/83934

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Title	Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory
Creator	NRID 1000070751113 1000070751113 ORCID 0000-0001-7494-5099 0000-0001-7494-5099 researchmap permalink nagakubo nagakubo Scopus Author ID 55329400300 55329400300 CreatorName Nagakubo, A.
	NRID 1000090643297 1000090643297 ORCID 0000-0002-7720-4023 0000-0002-7720-4023 researchmap permalink HeunTaeLee HeunTaeLee Scopus Author ID 15750933700 15750933700 CreatorName Lee, H. T.
	NRID 1000090252626 1000090252626 researchmap permalink read0042771 read0042771 Scopus Author ID 35563683500 35563683500 CreatorName Ogi, H.
	NRID 1000050643326 1000050643326 CreatorName Moriyama, T.
	NRID 1000090296749 1000090296749 CreatorName Ono, T.
Description	Nagakubo A., Lee H.T., Ogi H., et al. Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory. Applied Physics Letters, 116(2), 021901 (2020) https://doi.org/10.1063/1.5131768.
Abstract	Tungsten thin films are used for various applications and sometimes exhibit an A15 structure (β-W). They have some superior properties in comparison to the bcc structure (α-W), such as a higher superconducting transition temperature and larger spin Hall angle. However, elastic constants of β-W are unclear, which restricts mechanical applications and reliable density-functional-theory calculations. In this study, we synthesized α-W, β-W, and mixed-phase W films and determined their elastic constants by picosecond ultrasonics. We also calculated the elastic constants based on density functional theory and reveal that β-W has a larger elastic anisotropy and smaller shear modulus. Our calculation further indicates a stable stacking faulted β-W, which leads to a monoclinic structure.
Publisher	American Institute of Physics
Source Title	Applied Physics Letters
Volume (Issue)	116(2)
Page	021901-1-021901-5
Date of Issued	2020-01-13
Language	English
Handle URL	https://hdl.handle.net/11094/83934
PISSN	00036951
eISSN	10773118
NCID	AA11868096
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1063/1.5131768
Access Rights	open access
CopyRight	Copyright 2020 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters, 116(2), 021901, 2020 and may be found at https://doi.org/10.1063/1.5131768.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Applied Physics Letters. 2020, 116(2), p. 021901-1-021901-5
DC.title	Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory
DC.creator	Nagakubo, A.
	Lee, H. T.
	Ogi, H.
	Moriyama, T.
	Ono, T.
DC.publisher	American Institute of Physics
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2020-01-13
DC.identifier	https://doi.org/10.1063/1.5131768
DC.description	Nagakubo A., Lee H.T., Ogi H., et al. Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory. Applied Physics Letters, 116(2), 021901 (2020) https://doi.org/10.1063/1.5131768.
DCTERMS.abstract	Tungsten thin films are used for various applications and sometimes exhibit an A15 structure (β-W). They have some superior properties in comparison to the bcc structure (α-W), such as a higher superconducting transition temperature and larger spin Hall angle. However, elastic constants of β-W are unclear, which restricts mechanical applications and reliable density-functional-theory calculations. In this study, we synthesized α-W, β-W, and mixed-phase W films and determined their elastic constants by picosecond ultrasonics. We also calculated the elastic constants based on density functional theory and reveal that β-W has a larger elastic anisotropy and smaller shear modulus. Our calculation further indicates a stable stacking faulted β-W, which leads to a monoclinic structure.
DC.rights	Copyright 2020 Author(s). This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Applied Physics Letters, 116(2), 021901, 2020 and may be found at https://doi.org/10.1063/1.5131768.
DC.format	83934
citation_title	Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory
citation_author	Nagakubo, A.
	Lee, H. T.
	Ogi, H.
	Moriyama, T.
	Ono, T.
citation_publisher	American Institute of Physics
citation_language	English
citation_date	2020-01-13
citation_journal_title	Applied Physics Letters
citation_volume	116
citation_issue	2
citation_firstpage	021901-1
citation_lastpage	021901-5
citation_doi	https://doi.org/10.1063/1.5131768
citation_public_url	https://hdl.handle.net/11094/83934

Elastic constants of beta tungsten thin films studied by picosecond ultrasonics and density functional theory

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