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Kohn Anomaly and Phase Stability in Group VB Transition Metals
Lawrence Livermore Natl Lab, Div Phys, Livermore, CA 94551 USA..
Lawrence Livermore Natl Lab, Div Phys, Livermore, CA 94551 USA..
Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA..
Lawrence Livermore Natl Lab, Div Phys, Livermore, CA 94551 USA..
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2018 (English)In: Computation, E-ISSN 2079-3197, Vol. 6, no 2, article id 29Article, review/survey (Refereed) Published
Abstract [en]

In the periodic table, only a few pure metals exhibit lattice or magnetic instabilities associated with Fermi surface nesting, the classical examples being alpha-U and Cr. Whereas alpha-U displays a strong Kohn anomaly in the phonon spectrum that ultimately leads to the formation of charge density waves (CDWs), Cr is known for its nesting-induced spin density waves (SDWs). Recently, it has become clear that a pronounced Kohn anomaly and the corresponding softening in the elastic constants is also the key factor that controls structural transformations and mechanical properties in compressed group VB metals-materials with relatively high superconducting critical temperatures. This article reviews the current understanding of the structural and mechanical behavior of these metals under pressure with an introduction to the concept of the Kohn anomaly and how it is related to the important concept of Peierls instability. We review both experimental and theoretical results showing different manifestations of the Kohn anomaly in the transverse acoustic phonon mode TA (xi 00) in V, Nb, and Ta. Specifically, in V the anomaly triggers a structural transition to a rhombohedral phase, whereas in Nb and Ta it leads to an anomalous reduction in yield strength.

Place, publisher, year, edition, pages
MDPI , 2018. Vol. 6, no 2, article id 29
Keywords [en]
Kohn anomaly, Fermi surface nesting, phonon softening
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-228420DOI: 10.3390/computation6020029ISI: 000431867700003OAI: oai:DiVA.org:kth-228420DiVA, id: diva2:1210355
Note

QC 20180528

Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-05-28Bibliographically approved

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