Is There an Electronic Topological Transition in Zinc under High Pressure?

Klotz, Stefan; Braden, M.; Besson, J. M.

doi:10.1103/physrevlett.81.1239

Cited by 49 publications

(42 citation statements)

References 26 publications

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“…9 Inelastic neutron-scattering experiments on Zn showed no anomaly in the acoustic phonon frequency up to 9.4 GPa at room temperature. 10 Ramanscattering experiments showed no discontinuity in the optical phonon frequency up to 58 GPa at room temperature, although an indication of the ETT was suggested in the change in the Raman peak width. 11 These experimental results indicate that there is no anomaly in the lattice dynamics of Zn under pressure at room temperature.…”

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confidence: 87%

Axial ratio of Zn at high pressure and low temperature

et al. 2002

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High-pressure powder x-ray-diffraction experiments have been carried out on Zn with a He-pressure medium up to 18 GPa at 40 K. No anomaly in the volume dependence of the c/a axial ratio has been found within experimental errors. The c/a anomaly, which has been predicted to appear associated with the electronic topological transitions, should be extremely small. Thermal expansion of Zn rapidly decreases under high pressure, yielding nearly identical axial ratios at room and low temperatures.

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confidence: 87%

Axial ratio of Zn at high pressure and low temperature

et al. 2002

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“…Morgan et al 14 argued that phonon softening may occur at pressures higher than 8.8 GPa through collapse of the Kohn anomaly via an ETT. Subsequent inelastic n-scattering studies to 9.4 GPa by Klotz et al 15 of acoustic phonon modes found regular behavior of the ⌺ 3 , ⌺ 4 , and T 4 modes, i.e., the anomaly found by Morgan et al 14 could not be verified, and their lattice-dynamical calculations demonstrated that the strong decrease in f cannot be due to kϭ0 phonon modes sensitive to the occurrence of an ETT.…”

Section: Introductionmentioning

confidence: 93%

“…In this context it should be noted that there were arguments 15 that the change of f might be an artifact due to a phase transition in the pressure transmitting medium used in the Mössbauer experiments.…”

Section: Introductionmentioning

confidence: 99%

Pressure shift of the zone-center TO mode of Zn

et al. 2000

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The pressure dependence of the transverse-optical zone-center phonon mode of Zn was measured by means of Raman spectroscopy up to 58 GPa at room temperature. The frequency increases under pressure and no anomaly is observed in the pressure range around 10 GPa where electronic topological transitions are expected to occur, and where also ab initio ''frozen phonon'' calculations predict a weak anomaly in the c/a ratio. The relatively large value of the mode Grüneisen parameter ␥ i ϭϪd ln i /d ln V and its strong decrease under pressure are related to the high compressional anisotropy at ambient pressure and the gradual anisotropic → isotropic transition occurring with increasing pressure in Zn, respectively. An irregularity is observed in the pressure dependence of the line width around 10 GPa which may be related to changes in the phonon-phonon and electron-phonon interactions that could be a consequence of the electronic topological transitions.

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“…Reports of possible single or multiple anomalies in c/a ratio at pressures ranging from 9 GPa to over 25 GPa have been both attributed 3 and not attributed 12 to ETT; one study 13 found evidence for multiple ETTs at pressures up to 130 GPa that did not affect the compressional behaviour of Os, and a further study 14 concluded that there are no peculiarities in the pressure-driven evolution of the atomic and electronic structure of Os. The inconsistencies in the theoretical highpressure behaviour of Os mirror the difficulties encountered when probing the high-pressure behaviour of 3d hcp metals such as Zn and e-Fe (refs [15][16][17][18][19]. These difficulties add further interest to detailed studies of the 5d element Os, to allow a broader comparison of the crystal chemistry of hcp metals.…”

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confidence: 94%

The most incompressible metal osmium at static pressures above 750 gigapascals

Dubrovinsky

Dubrovinskaia

Bykova

et al. 2015

Nature

186

206

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Metallic osmium (Os) is one of the most exceptional elemental materials, having, at ambient pressure, the highest known density and one of the highest cohesive energies and melting temperatures. It is also very incompressible, but its high-pressure behaviour is not well understood because it has been studied so far only at pressures below 75 gigapascals. Here we report powder X-ray diffraction measurements on Os at multi-megabar pressures using both conventional and double-stage diamond anvil cells, with accurate pressure determination ensured by first obtaining self-consistent equations of state of gold, platinum, and tungsten in static experiments up to 500 gigapascals. These measurements allow us to show that Os retains its hexagonal close-packed structure upon compression to over 770 gigapascals. But although its molar volume monotonically decreases with pressure, the unit cell parameter ratio of Os exhibits anomalies at approximately 150 gigapascals and 440 gigapascals. Dynamical mean-field theory calculations suggest that the former anomaly is a signature of the topological change of the Fermi surface for valence electrons. However, the anomaly at 440 gigapascals might be related to an electronic transition associated with pressure-induced interactions between core electrons. The ability to affect the core electrons under static high-pressure experimental conditions, even for incompressible metals such as Os, opens up opportunities to search for new states of matter under extreme compression.

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Is There an Electronic Topological Transition in Zinc under High Pressure?

Cited by 49 publications

References 26 publications

Axial ratio of Zn at high pressure and low temperature

Axial ratio of Zn at high pressure and low temperature

Pressure shift of the zone-center TO mode of Zn

The most incompressible metal osmium at static pressures above 750 gigapascals

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