Lattice dynamics of vanadium: Inelastic x-ray scattering measurements

Bosak, A.; Hoesch, Moritz; Antonangeli, Daniele; Farber, Daniel L.; Fischer, Irmengard; Krisch, M.

doi:10.1103/physrevb.78.020301

Cited by 28 publications

(36 citation statements)

References 20 publications

(20 reference statements)

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“…This suggests that the Kohn anomaly is weaker in Ta than in V and Nb. To validate this conclusion, Landa et al [76] show in Figure 4a-c the experimental phonon dispersion TA branches in the (ξ00) direction for V, Nb, and Ta, respectively, using numerical data on the phonon frequencies from refs [70,94,95]. The position of the peak on the partial generalized susceptibility curve at equilibrium pressure, marked in Figure 3, is shown by an arrow in Figure 4.…”

Section: Early Search For Phase Transformations In V Nb and Tamentioning

confidence: 85%

“…In Ta, the softening is less severe but apparent between 500 and 800 kbar. With the X-ray scattering approach, Bosak et al [70] have discovered several anomalies in the phonon dispersion curve for V along high-symmetry directions. One of them was an upward bending of the TA phonon mode along the Γ-H direction, (ξ00), around ξ = 0.24-this anomaly was predicted in refs [49,61].…”

Section: Early Search For Phase Transformations In V Nb and Tamentioning

confidence: 99%

“…Whether the TA (ξ00) phonon anomaly in VB transition metals is actually electronic and related with "nesting areas" of the FS can be resolved by comparing the nesting vectors, q n = 2k F , in all the VB metals with the locations of their phonon anomalies, measured experimentally: V [70], Nb [94], and Ta [95]. As mentioned in the introduction, the vectors q n should correspond to peaks in the real part of the noninteracting susceptibility, Re χ 0 (q), which hereafter will be denoted simply as χ(q).…”

Section: Early Search For Phase Transformations In V Nb and Tamentioning

confidence: 99%

“…The initial pressure of the softening is in an agreement with previous IXS pressure gradient measurements [73] as well as the ab initio calculations [71] which have revealed a surprising softening of the shear modulus of tantalum between 500 and 800 kbar. Figure 6, which is taken from ref [88], shows that the trigonal shear elastic modulus C 44 (Figure 6a) determined either by first-principles calculations [71] or deduced from the measured sound velocity using the IXS technique [70] exhibits softening. Both yield strengths, calculated either using the shear modulus obtained using the Steinberg model [100] or that extracted from the IXS measurements [73] (Figure 6b) also exhibit softening.…”

Section: Strength and Elasticity Of Nb And Tamentioning

confidence: 99%

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Kohn Anomaly and Phase Stability in Group VB Transition Metals

et al. 2018

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Abstract:In the periodic table, only a few pure metals exhibit lattice or magnetic instabilities associated with Fermi surface nesting, the classical examples being α-U and Cr. Whereas α-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 (ξ00) 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.

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Section: Early Search For Phase Transformations In V Nb and Tamentioning

confidence: 85%

Section: Early Search For Phase Transformations In V Nb and Tamentioning

confidence: 99%

Section: Early Search For Phase Transformations In V Nb and Tamentioning

confidence: 99%

Section: Strength and Elasticity Of Nb And Tamentioning

confidence: 99%

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Kohn Anomaly and Phase Stability in Group VB Transition Metals

et al. 2018

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“…Sound velocities of materials at HP to over 1 Mbar have been measured [12,[285][286][287] using HERIX. With single-crystal samples, complete phonon dispersions in the Brillouin zone can be mapped by HERIX at HP [100,288,289]. However, lattice dynamical data at HP are still limited, largely due to constraints by the strict requirements of sample quality, hydrostaticity, and, to some extent, beam time availability.…”

Section: Hp Mev Resolved Inelastic X-ray Scatteringmentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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Pressure profoundly alters all states of matter. The symbiotic development of ultrahighpressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; and synchrotron x-ray techniques, to probe materials' properties in situ, has enabled the exploration of rich high-pressure (HP) science. In this article, we first introduce the essential concept of diamond anvil cell technology, together with recent developments and its integration with other extreme environments. We then provide an overview of the latest developments in HP synchrotron techniques, their applications, and current problems, followed by a discussion of HP scientific studies using x-rays in the key multidisciplinary fields. These HP studies include: HP x-ray emission spectroscopy, which provides information on the filled electronic states of HP samples; HP x-ray Raman spectroscopy, which probes the HP chemical bonding changes of light elements; HP electronic inelastic x-ray scattering spectroscopy, which accesses high energy electronic phenomena, including electronic band structure, Fermi surface, excitons, plasmons, and their dispersions; HP resonant inelastic x-ray scattering spectroscopy, which probes shallow core excitations, multiplet structures, and spin-resolved electronic structure; HP nuclear resonant x-ray spectroscopy, which provides phonon densities of state and time-resolved Mössbauer information; HP x-ray imaging, which provides information on hierarchical structures, dynamic processes, and internal strains; HP x-ray diffraction, which determines the fundamental structures and densities of single-crystal, polycrystalline, nanocrystalline, and non-crystalline materials; and HP radial x-ray diffraction, which yields deviatoric, elastic and rheological information. Integrating these tools with hydrostatic or uniaxial pressure media, laser and resistive heating, and cryogenic cooling, has enabled investigations of the structural, vibrational, electronic, and magnetic properties of materials over a wide range of pressure-temperature conditions.

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High-Resolution Inelastic X-Ray Scattering I: Context, Spectrometers, Samples, and Superconductors

Baron¹

2020

Synchrotron Light Sources and Free-Electron Lasers

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Lattice dynamics of vanadium: Inelastic x-ray scattering measurements

Cited by 28 publications

References 20 publications

Kohn Anomaly and Phase Stability in Group VB Transition Metals

Kohn Anomaly and Phase Stability in Group VB Transition Metals

High-pressure studies with x-rays using diamond anvil cells

High-Resolution Inelastic X-Ray Scattering I: Context, Spectrometers, Samples, and Superconductors

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