Chemical effect on the structural and dynamical properties in Zr-Ni-Al liquids

Peng, Hailong; Yang, Fan; Liu, S. T.; Holland‐Moritz, D.; Kordel, Tobias; Hansen, Thomas C.; Voigtmann, Thomas

doi:10.1103/physrevb.100.104202

Cited by 19 publications

(14 citation statements)

References 83 publications

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“…The recent development of non-Hermitian quantum mechanics [1][2][3][4][5][6][7][8][9][10][11] has opened up the perspective in several branches of physics [12][13][14][15][16][17][18][19][20][21]. The remarkable features of a non-Hermitian system is the violation of conservation law of the Dirac probability and the exceptional point (EP) or spectral singularity (SS).…”

Section: Introductionmentioning

confidence: 99%

Exceptional-point-induced lasing dynamics in a non-Hermitian Su-Schrieffer-Heeger model

2019

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Non-Hermitian systems exhibit many peculiar dynamic behaviors which never showed up in Hermitian systems. The existence of spectral singularity (SS) for a non-Hermitian scattering center provides a lasing mechanism in the context of quantum mechanics. In this paper we show exactly that a finite system at exceptional point (EP) can also provide an alternative laser solution. We investigate the dynamics of non-Hermitian Su-Schrieffer-Heeger (SSH) model around EP, based on the analysis of parity-time (PT ) and chiral-time (CT ) symmetries of the Hamiltonian. In contrast to the SS lasing mechanism for an infinite system, such an SSH chain acts as an active laser medium at threshold, within which a stationary particle emission can be fired anywhere, rather than a specific location at the non-Hermitian scattering center only. In addition, some relevant peculiar phenomena arising from interference between wave packets are revealed based on the analytical solutions.

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Section: Introductionmentioning

confidence: 99%

Exceptional-point-induced lasing dynamics in a non-Hermitian Su-Schrieffer-Heeger model

2019

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“…We focus here on Zrbased melts; experimental data are available for the binary Zr 64 Ni 36 [35] [37]), measured using electrostatic and electromagnetic levitation techniques. We complement these data by those from molecular-dynamics simulations of Zr-Ni-Al melts whose MD interaction potentials have been carefully matched with structural and dynamical experimental data [36].…”

Section: Linear Rheologymentioning

confidence: 99%

Rheology of colloidal and metallic glass formers

Voigtmann

Siebenbürger²,

Amann

et al. 2020

Colloid Polym Sci

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Colloidal hard-sphere suspensions are convenient experimental models to understand soft matter, and also by analogy the structural-relaxation behavior of atomic or small-molecular fluids. We discuss this analogy for the flow and deformation behavior close to the glass transition. Based on a mapping of temperature to effective hard-sphere packing, the stressstrain curves of typical bulk metallic glass formers can be quantitatively compared with those of hard-sphere suspensions. Experiments on colloids give access to the microscopic structure under deformation on a single-particle level, providing insight into the yielding mechanisms that are likely also relevant for metallic glasses. We discuss the influence of higherorder angular signals in connection with non-affine particle rearrangements close to yielding. The results are qualitatively explained on the basis of the mode-coupling theory. We further illustrate the analogy of pre-strain dependence of the linear-elastic moduli using data on PS-PNiPAM suspensions.

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“…13,15,21 For purely metallic alloys with comparable atomic radii, this approximation works quite well. Since Sulfur is a nonmetallic element, some amount of covalent bonds could be involved as previously observed for BMGs like Zr-(Ni,Co,Cu)-Al [22][23][24][25][26][27][28] and Pd-Ni-P. 29 In this case, specific chemical interactions may invalidate the assumption of tabulated atomic radii.…”

mentioning

confidence: 92%

Impact of Sulfur on the melt dynamics of glass forming Ti75Ni25−xSx

Wilden

Yang

Holland‐Moritz

et al. 2020

Applied Physics Letters

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Substitution of Nickel by Sulfur leads to bulk metallic glass formation in eutectic Ti 75 Ni 25 . In order to understand the improved glass forming ability, a detailed analysis of the melt dynamics was performed. We measured the density, the viscosity, and the self-diffusion of Ti 75 Ni 25 x S x (x ¼ 0, 5, 8) melts as a function of temperature. Moreover, the viscosity was measured under reduced gravity conditions to benchmark ground-based data. The self-diffusion coefficients were probed by incoherent, quasi-elastic neutron scattering. All measurements were combined with electrostatic or electromagnetic levitation, in order to process these highly reactive Titanium-based melts. From the measured density, the packing fraction was calculated as a function of temperature. In contrast to other bulk metallic glasses, the decrease in melt dynamics comes along with the decrease in packing density.

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Chemical effect on the structural and dynamical properties in Zr-Ni-Al liquids

Cited by 19 publications

References 83 publications

Exceptional-point-induced lasing dynamics in a non-Hermitian Su-Schrieffer-Heeger model

Exceptional-point-induced lasing dynamics in a non-Hermitian Su-Schrieffer-Heeger model

Rheology of colloidal and metallic glass formers

Impact of Sulfur on the melt dynamics of glass forming Ti75Ni25−xSx

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