Electronically Driven Soft Modes in Zinc Metal

Potzel, W.; Steiner, Markus J.; Karzel, Helmut; Schiessl, W.; Köfferlein, M.; Kalvius, G. M.; Blaha, Peter

doi:10.1103/physrevlett.74.1139

Cited by 62 publications

(76 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: -P3 Epj Web Of Conferencesmentioning

confidence: 71%

“…Existence of the electronic phase transition in zinc at P = 6.6 GPa and T = 4.2 K also follows from Moessbauer spectroscopy [18], which suggests a drastic change in the crystalline lattice dynamics in this transition. In [16], [18], this transition is treated as a Lifshitz topological phase transition (TPT) [19]. Since 1995, there have been published a lot of experimental and theoretical investigations to prove the existence of TPT in zinc, which yielded contradictory results (see, e.g., [20]).…”

Section: -P3 Epj Web Of Conferencesmentioning

confidence: 71%

See 1 more Smart Citation

Electronic phases of substances. Phase transitions with change of electron and crystalline structure

Nadykto¹

2015

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. There is plenty of experimental data on high-pressure phase transformations in various materials. Variations in materials characteristics (for example, equilibrium density and bulk modulus), while the crystalline structure remains unchanged, are indicative of energy variations in outer-shell electrons of solid atoms. In experiments with crystalline structure variations, the dependence of pressure on density in some cases can be described by the same curve, the parameters of which are independent of the crystalline structure. Examples of such transformations in some materials at static compression and in shock-wave experiments are given.

show abstract

Section: -P3 Epj Web Of Conferencesmentioning

confidence: 71%

Section: -P3 Epj Web Of Conferencesmentioning

confidence: 71%

Electronic phases of substances. Phase transitions with change of electron and crystalline structure

Nadykto¹

2015

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…The earlier studies by Lynch and Drickamer [78], which found a nonmonotonic pressure dependence of the c/a ratio in Zn and Cd, are contradicted by more recent results by Schlute et al [79], where c/a did not show such a behavior. Takemura [75] has shown that the volume dependence of c/a in Zn changes its slope at V/V 0 = 0.893 (P = 9.1 GPa), while Potzel et al [76] found a drastic drop (by a factor of 2) of the Lamb-Mössbauer factor, indicating a drastic softening of low-frequency acoustic and optical phonons at V/V 0 ≈ 0.915 (P = 6.6 GPa). A change in the curvature of the electric field gradient (EFG) dependence on pressure was also observed [76,77].…”

Section: Hexagonal Close-packed Zinc Under Pressurementioning

confidence: 99%

“…Large c/a ratios make many of their solid-state properties highly anisotropic and so they have been extensively studied both experimentally [64 -69] and theoretically [70 -74]. Although the electronic and lattice properties of Zn and Cd have been studied for many years, recent publications by Takemura [75] on Zn in high-pressure powder Xray diffraction experiments (at room temperature) and by Potzel et al [76,77] on 67 Zn Mössbauer studies (at 4.2 K) have renewed interest in these metals, and seem to resolve the question of the anomalous lattice properties of Zn under hydrostatic pressure. The earlier studies by Lynch and Drickamer [78], which found a nonmonotonic pressure dependence of the c/a ratio in Zn and Cd, are contradicted by more recent results by Schlute et al [79], where c/a did not show such a behavior.…”

Section: Hexagonal Close-packed Zinc Under Pressurementioning

confidence: 99%

Electronic structure of materials under pressure

Christensen

Novikov

2000

Int. J. Quant. Chem.

View full text Add to dashboard Cite

Parameter-free calculations based on the density-functional theory are used to examine high-pressure phases of solids. For the elemental semiconductors, as represented by Si, the high-pressure phases are examined in some detail, and particular attention is paid to the Si(VI)orthorhombic (Cmca) structure which was resolved only very recently. For III-V semiconductors the optimization of the structural parameters of the Cmcm and Imm2 phases is described. The structural energy differences are in several cases very small, and in some cases too small to allow a safe structure prediction on the basis of the calculations. In that context we also discuss ways to go beyond the local density approximation (LDA). We show that the predicted high-pressure phases may be significantly affected by inclusion of (generalized) gradient corrections (GGA). Elemental Zn (hcp) is further taken as an example where we find that the simple LDA leads to poor results for the equilibrium volume and axial ratio (c/a). Introducing corrections, for example by GGA, it is, however, possible to achieve an accuracy that allows a study of the structural changes of Zn (and Cd) under pressure and analysis of these changes in terms of electronic topological transitions.

show abstract

“…The Lifshitz transition has been explored in a variety of systems, from high-temperature copper-oxide [8][9][10][11] and iron-based superconductors 12 to superfluid helium 13 . In condensed matter systems, the change in Fermi surface at the Lifshitz transition affects observable quantities such as resistivity and thermoelectric power 6,14 , lattice dynamics, elastic moduli and related thermal properties such as heat capacity and thermal expansion 7,[15][16][17][18][19][20][21][22] . In some cases, it determines the peculiarities of phase diagrams of metals under pressure as well as metal alloys 7,19,20 .…”

Section: Introductionmentioning

confidence: 99%

Interaction-driven Lifshitz transition with dipolar fermions in optical lattices

Loon¹,

Katsnelson²,

Chomaz

et al. 2016

Phys. Rev. B

View full text Add to dashboard Cite

Anisotropic dipole-dipole interactions between ultracold dipolar fermions break the symmetry of the Fermi surface and thereby deform it. Here we demonstrate that such a Fermi surface deformation induces a topological phase transition -so-called Lifshitz transition -in the regime accessible to present-day experiments. We describe the impact of the Lifshitz transition on observable quantities such as the Fermi surface topology, the density-density correlation function, and the excitation spectrum of the system. The Lifshitz transition in ultracold atoms can be controlled by tuning the dipole orientation and -in contrast to the transition studied in crystalline solids -is completely interaction-driven.

show abstract

Electronically Driven Soft Modes in Zinc Metal

Cited by 62 publications

References 15 publications

Electronic phases of substances. Phase transitions with change of electron and crystalline structure

Electronic phases of substances. Phase transitions with change of electron and crystalline structure

Electronic structure of materials under pressure

Interaction-driven Lifshitz transition with dipolar fermions in optical lattices

Contact Info

Product

Resources

About