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91.
N. A. Inogamov S. I. Ashitkov V. V. Zhakhovsky V. V. Shepelev V. A. Khokhlov P. S. Komarov M. B. Agranat S. I. Anisimov V. E. Fortov 《Applied Physics A: Materials Science & Processing》2010,101(1):1-5
Ultrashort laser pulse transfers metal into a two-temperature warm dense matter state and triggers a chain of hydrodynamic
and kinetic processes—melting, expansion, stretching, creation of tensile stress and transition into metastable state. We
study the response of aluminum film deposited on a glass substrate to irradiation by a pump laser pulse transmitted through
glass. Several films with thicknesses from 350 to 1200 nm have been investigated. The smallest thickness is of the order of
the heating depth d
T∼100 nm in Al. The d
T-layer and the free rear side of the film are coupled through pressure waves propagating between them. Therefore, the processes
within d
T-layer affects the time dependent displacement Δ
x
rear(t) of the rear surface. We compare simulated and experimental dependencies Δ
x
rear(t) obtained by the pump–probe technique. It allows us to define a thickness of molten Al layer and explore the two-temperature
processes occurring inside the heated layer. 相似文献
92.
A. O. Shorikov J. E. Medvedeva A. I. Poteryaev V. V. Mazurenko V. I. Anisimov 《JETP Letters》2010,91(9):486-489
We present ab initio investigation of the electronic structure and magnetic properties of uranium monochal-cogenides: US,
USe, UTe. The calculations were performed by using the recently developed LDA+U+SO method in which both Coulomb and spin-orbit interactions have been taken into account in rotationally invariant form.
We discuss the problem of choice of the Coulomb interaction value. The calculated [111] easy axes agree with those experimentally
observed. The electronic configuration 5f
3 was found for all uranium compounds under investigation. 相似文献
93.
We report the LDA + DMFT (method combining local density approximation with dynamical mean-field theory) results for spectral properties of the superconductor NdFeAsO0.9F0.1 in the paramagnetic phase. The calculated momentum-resolved spectral functions are in good agreement with angle-resolved photoemission spectra (ARPES). The obtained effective quasiparticle mass enhancement (m*/m = 1.4) is smaller than the one in isostructural parent compound LaFeAsO which critical temperature under the same fluorine doping (LaFeAsO0.9F0.1) is two times lower. Our results demonstrate that in quaternary FeAs-based superconductors of the same class, changes of the crystal structure caused by substitution of one rare-earth atom, implicitly result in reduction of the electronic correlation strength. 相似文献
94.
A. O. Shorikov V. I. Anisimov M. A. Korotin V. V. Dremov Ph. A. Sapozhnikov 《Journal of Experimental and Theoretical Physics》2013,117(4):691-698
The influence of vacancies and interstitial atoms on magnetism in Pu is considered in the framework of the density functional theory. The crystal structure relaxation arising due to various types of defects is calculated using the molecular dynamics method with a modified embedded atom model. The local density approximation with explicit inclusion of Coulomb and spin-orbit interactions is applied in matrix invariant form to describe correlation effects in Pu with these types of defects. The calculations show that both vacancies and interstitials give rise to local moments in the f-shell of Pu in good agreement with experimental data for aged Pu. Magnetism appears due to the destruction of a delicate balance between spin-orbit and exchange interactions. 相似文献
95.
I. O. Volkov L. V. Filimonova A. A. Anisimov O. V. Sinitsyna O. A. Belyakova A. A. Voronina Ya. V. Zubavichus A. G. Filatova L. I. Makarova I. V. Yaminsky B. G. Zavin E. M. Belavtseva 《Bulletin of the Russian Academy of Sciences: Physics》2013,77(8):986-989
The structure of siloxane-urethane-ethylene oxide block copolymers is studied by means of atom force microscopy (AFM) and scanning electron microscopy (SEM). The degree of copolymer crystallinity is determined by X-ray diffraction. A correlation between the obtained results is established. 相似文献
96.
V. I. Gaman O. V. Anisimov N. K. Maksimova N. V. Sergeichenko E. Yu. Sevast’yanov E. V. Chernikov 《Russian Physics Journal》2008,51(8):831-839
The results of theoretical and experimental studies into the effect of water vapor on the electrical conductance of a gas
sensor and the sensor response to hydrogen action are discussed. A relation describing the dependence of electrical conductance
G0 on absolute humidity in the pure air is derived using a hypothesis of the presence of space-charge regions depleted of electrons
between the SnO
2
grains in a polycrystalline tin dioxide film. Due to dissociative chemisorption of water molecules, the energy-band bending
at the SnO
2
grain interfaces decreases and the oxygen-vacancy concentration in the grains increases, resuling in an increase in G0. An equation for the sensor response to hydrogen action is derived (the G1/G0, ratio, where G1 is the sensor conductance in a gas mixture containing molecular hydrogen). The expression describes the dependence of G1/G0 on the hydrogen concentration in the interval 50–6·103 ppm, band bending at the SnO
2
grain interface, and sensor temperature. The dependences of the sensor conductance, highest possible conductance, and energy-band
bending on temperature and absolute humidity resulting from processing of the experimental data are in good agreement with
the theoretical predictions.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 50–56, August, 2008. 相似文献
97.
Komarek AC Streltsov SV Isobe M Möller T Hoelzel M Senyshyn A Trots D Fernández-Díaz MT Hansen T Gotou H Yagi T Ueda Y Anisimov VI Grüninger M Khomskii DI Braden M 《Physical review letters》2008,101(16):167204
Combining infrared reflectivity, transport, susceptibility, and several diffraction techniques, we find compelling evidence that CaCrO3 is a rare case of a metallic and antiferromagnetic transition-metal oxide with a three-dimensional electronic structure. Local spin density approximation calculations correctly describe the metallic behavior as well as the anisotropic magnetic ordering pattern of C type: The high Cr valence state induces via sizable pd hybridization remarkably strong next-nearest-neighbor interactions stabilizing this ordering. The subtle balance of magnetic interactions gives rise to magnetoelastic coupling, explaining pronounced structural anomalies observed at the magnetic ordering transition. 相似文献
98.
S. I. Anisimov N. A. Inogamov Yu. V. Petrov V. A. Khokhlov V. V. Zhakhovskii K. Nishihara M. B. Agranat S. I. Ashitkov P. S. Komarov 《Applied Physics A: Materials Science & Processing》2008,92(4):939-943
The developed model including hydrodynamics with electron heat conduction and electron–ion energy exchange, and cavitation
breakup of stretched metastable liquid aluminum (Al) is compared with our laser experiments. For the first time the measured
and calculated ablation thresholds agree well in both crater depth and fluence. 相似文献
99.
Demishev S. V. Anisimov M. A. Voronov V. V. Gilmanov M. I. Glushkov V. V. Karasev M. S. Filipov V. B. Shitsevalova N. Yu. 《Doklady Physics》2020,65(7):233-237
Doklady Physics - The temperature dependence of the conductivity of the topological Kondo-insulator (TKI) Sm1 – xYbxB6 is investigated in the temperature range 2 < T < 300 K for... 相似文献
100.
Breev I. D. Likhachev K. V. Yakovleva V. V. Veishtort I. P. Skomorokhov A. M. Nagalyuk S. S. Mokhov E. N. Astakhov G. V. Baranov P. G. Anisimov A. N. 《JETP Letters》2021,114(5):274-278
JETP Letters - The effect of static mechanical strain on the splitting of spin sublevels of color centers based on spin 3/2 silicon vacancies in silicon carbide at room temperature has been shown.... 相似文献