Superfluid density in the underdoped YBa2Cu3O7-x: evidence for d-density-wave order of the pseudogap

The investigation of the penetration depth lambda(ab)(T,p) in YBa2Cu3O7-x crystals allowed one to observe the following features of the superfluid density n(s)(T,p) proportional, variant lambda(-2)(ab)(T,p) as a function of temperature T0) depends on p slightly in the optimally and moderately doped regions (0.10相似文献   

Shock compression of liquid nitrogen at a pressure of 320 GPa

The experimental data on the shock compression of liquid nitrogen in the megabar pressure range are reported. The experiments have been performed with a spherical measuring setup in which pressure is created by the impact of a steel shell accelerated to a velocity of 23 km/s on the samples. The density of shock-compressed nitrogen at a pressure of about 320 GPa is about 3.4 g/cm³ (compression degree of about 4.2). The experimental data are described using a model equation of state.     

Strength and fracture of plutonium and its alloy with gallium under impact loading

Results are presented from a theoretical analysis of the conditions of cleavage fracture of plutonium and its alloy with 1.6 wt. % gallium under shock loading. Experimental data obtained earlier are used to determine the critical tensile stresses corresponding to the initial stage of macroscopic cleavage fracture of specimens. The elastoplastic properties of the materials and polymorphic transformations that occur in the alloy at normal and high (315°C) temperatures were taken into account in the calculations. Institute of Experimental Physics, Sarov 607190. Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 39, No. 4, pp. 135–140, July–August, 1998.     

Dynamic Destruction as Analogs of Critical Phenomena in Metal Samples with Various Geometries within a Wide Ranges of Amplitude–Time Characteristics of External Action

Physics of Atomic Nuclei - The quantitative characteristics of the products of dispersion and the cascade of dissipative structures arising in metals under shock-wave loading are determined. The...     

Double P-wave charmonium production in e + e − annihilation

On the basis of perturbative QCD and relativistic quark model we calculate relativistic and bound state corrections in the production processes of a pair of \(\mathcal{P}\) -wave charmonium states. Relativistic factors in the production amplitude are taken into account connected with the relative motion of heavy quarks and the transformation law of the bound-state wave function to the reference frame of the moving \(\mathcal{P}\) -wave mesons. Relativistic corrections to the quark bound-state wave functions in the rest frame are considered by means of the Breit-like potential. It turns out that the examined effects change essentially nonrelativistic results of the cross section for the reaction e ⁺ + e ^? → h _c + χ _c J at the center-of-mass energy √s = 10.6 GeV.     

Computer modeling of the eutectic parameters for the Li,Na,Ca∥F and K,Li,Sr∥F three-component systems

The computer modeling of the eutectic parameters for the Li,NaCa∥F and K,Li,Sr∥F three-component systems is considered. The modeling allows automated computation of the eutectic parameters (temperature and composition) with an accuracy sufficient for scientific and applied purposes. The time consumed for the conventional investigation of the systems by means of the internal sections techniques combined with visual polythermal analysis is compared to the time required for the computer-assisted modeling.     

Thermal Analysis of Pseudoternary Systems Me4P2O7-WO3-MeCl (Me = Na,K)

Thermal analysis of the pseudoternary systems Na₄P₂O₇-WO₃-NaCl and K₄P₂O₇-WO₃-KCl was performed, and the crystallization fields were revealed of sodium and potassium pyrophosphates, incongruently melting compounds Na₄P₂O₇·3WO₃ and K₄P₂O₇·3WO₃, and of products formed by reactions of WO₃ with NaCl and KCl. Low-melting compositions were revealed, which are of interest for preparing Na(K)-W oxide bronzes.