134 research outputs found
Antiferromagnetism and charged vortices in high-Tc superconductors
The effect of the long-range Coulomb interaction on charge accumulation in
antiferromagnetic vortices in high-Tc superconductors is studied within a
Bogoliubov-de Gennes mean-field model of competing antiferromagnetic and d-wave
superconducting orders. Antiferromagnetism is found to be associated with an
accumulation of charge in the vortex core, even in the presence of the
long-range Coulomb interaction. The manifestation of Pi-triplet pairing in the
presence of coexisting dSC and AFM order, and the intriguing appearance of
one-dimensional stripe-like ordering are discussed. The local density of states
(LDOS) in the vortex core is calculated and is found to be in excellent
qualitative agreement with experimental data.Comment: 14 pages, 8 figures, 2 column RevTex4 PRB forma
High pressure effects in severe plastic deformation
The analysis is made of effect and physical mechanisms of the influence of pressure on metal materials that are in the state of plastic flow, as well as on characteristics of materials undergone severe plastic deformation under pressure
Twist extrusion
The work presents the results of research and development on Twist Extrusion (TE) process. It was shown the two main deformation zones of TE are located at the two ends of the twist part of the die. The mode of deformation in these zones is simple shear in the transversal layers, as in high pressure torsion (HPT). In terms of strain, at the first approximation, the billet during TE like passes through two βtransparentβ HPT anvils. TE has a significant commercial potential due to the following physical effects: intensive grain refinement; homogenization and mixing; intensive powders consolidation. There are three main areas in TE application for the present: formation the submicron and nanostructures in the bulk metals samples; processing of the recycled non-ferrous metals and alloys for the improvement of the mechanical properties; production the bulk samples through powders consolidation. Donetsk Institute for Physics and Engineering created a TE Center to showcase the process and educate investors. Our experience with the center has shown that the most prospective directions are producing ultrafine-grained alloys for medical and aircraft applications.ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΏΡΠΎΡΠ΅ΡΡΠ° Π²ΠΈΠ½ΡΠΎΠ²ΠΎΠΉ ΡΠΊΡΡΡΡΠ·ΠΈΠΈ (ΠΠ) ΠΈ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΎΠΊ ΠΏΠΎ Π΅Π³ΠΎ ΠΎΡΡΡΠ΅ΡΡΠ²Π»Π΅Π½ΠΈΡ. ΠΠΎΠΊΠ°Π·Π°Π½ΠΎ, ΡΡΠΎ ΠΎΡΠ½ΠΎΠ²Π½Π°Ρ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² ΠΏΡΠΈ ΠΠ ΠΏΡΠΎΠΈΡΡ
ΠΎΠ΄ΠΈΡ Π² Π΄Π²ΡΡ
Π·ΠΎΠ½Π°Ρ
ΠΏΡΠΎΡΡΠΎΠ³ΠΎ ΡΠ΄Π²ΠΈΠ³Π°, ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½ΡΡ
ΠΏΠΎ Π³ΡΠ°Π½ΠΈΡΠ°ΠΌ Π²ΠΈΠ½ΡΠΎΠ²ΠΎΠ³ΠΎ ΡΡΠ°ΡΡΠΊΠ° ΠΌΠ°ΡΡΠΈΡΡ. ΠΠ ΠΈΠΌΠ΅Π΅Ρ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΡΠΉ ΠΊΠΎΠΌΠΌΠ΅ΡΡΠ΅ΡΠΊΠΈΠΉ ΠΏΠΎΡΠ΅Π½ΡΠΈΠ°Π» Π±Π»Π°Π³ΠΎΠ΄Π°ΡΡ Π±ΡΡΡΡΠΎΠΌΡ ΠΈΠ·ΠΌΠ΅Π»ΡΡΠ΅Π½ΠΈΡ Π·Π΅ΡΠ΅Π½ ΠΈ ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΠΌΡ ΠΌΠ°ΡΡΠΎΠΏΠ΅ΡΠ΅Π½ΠΎΡΡ, ΠΏΡΠΈΠ²ΠΎΠ΄ΡΡΠ΅ΠΌΡ ΠΊ Π³ΠΎΠΌΠΎΠ³Π΅Π½ΠΈΠ·Π°ΡΠΈΠΈ ΠΈ ΠΏΠ΅ΡΠ΅ΠΌΠ΅ΡΠΈΠ²Π°Π½ΠΈΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ². Π Π½Π°ΡΡΠΎΡΡΠ΅Π΅ Π²ΡΠ΅ΠΌΡ Π½Π°ΠΌΠ΅ΡΠΈΠ»ΠΈΡΡ ΡΡΠΈ ΠΎΡΠ½ΠΎΠ²Π½ΡΡ
Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΡ Π² ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΠΈ ΠΠ: ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΡΠ±ΠΌΠΈΠΊΡΠΎΠ½Π½ΡΡ
ΠΈ Π½Π°Π½ΠΎΡΡΡΡΠΊΡΡΡ Π² ΠΌΠ΅ΡΠ°Π»Π»Π°Ρ
ΠΈ ΡΠΏΠ»Π°Π²Π°Ρ
; ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ° Π²ΡΠΎΡΠΈΡΠ½ΡΡ
ΡΠ²Π΅ΡΠ½ΡΡ
ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠ² ΠΈ ΡΠΏΠ»Π°Π²ΠΎΠ² Π΄Π»Ρ ΡΠ»ΡΡΡΠ΅Π½ΠΈΡ ΠΈΡ
ΠΌΠ΅Ρ
Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ²; ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²ΠΎ ΠΎΠ±ΡΠ΅ΠΌΠ½ΡΡ
ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² ΠΏΡΡΠ΅ΠΌ ΠΊΠΎΠ½ΡΠΎΠ»ΠΈΠ΄Π°ΡΠΈΠΈ ΠΏΠΎΡΠΎΡΠΊΠΎΠ². ΠΠΎΠ½Π΅ΡΠΊΠΈΠΉ ΡΠΈΠ·ΠΈΠΊΠΎ-ΡΠ΅Ρ
Π½ΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΈΠ½ΡΡΠΈΡΡΡ ΡΠΎΠ·Π΄Π°Π» ΠΎΠΏΡΡΠ½ΡΠΉ ΡΡΠ°ΡΡΠΎΠΊ ΠΠ, ΡΡΠΎΠ±Ρ ΠΏΡΠΎΠ΄Π΅ΠΌΠΎΠ½ΡΡΡΠΈΡΠΎΠ²Π°ΡΡ ΠΏΡΠΎΡΠ΅ΡΡ ΠΈ ΠΏΡΠΈΠ²Π»Π΅ΡΡ ΠΈΠ½Π²Π΅ΡΡΠΎΡΠΎΠ². ΠΠΏΡΡ ΡΠ°Π±ΠΎΡΡ ΡΡΠΎΠ³ΠΎ ΡΡΠ°ΡΡΠΊΠ° ΠΏΠΎΠΊΠ°Π·Π°Π», ΡΡΠΎ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΠΌ Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠ΅ΠΌ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΠ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΏΡΠΎΠΈΠ·Π²ΠΎΠ΄ΡΡΠ²ΠΎ ΡΡΠ±ΠΌΠΈΠΊΡΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π΄Π»Ρ ΠΌΠ΅Π΄ΠΈΡΠΈΠ½Ρ ΠΈ Π°Π²ΠΈΠ°ΡΠΈΠΈ
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