822 research outputs found
The Effect of Atmospheric Pollution on Building Materials in the Urban Environment
Nowadays atmospheric pollution affects not only the urban environment in general, but building materials, which leads to their corrosion, in particular. The article discusses the regularities of the adhesion process of particulate matter (dust) on the vertical surfaces of buildings and structures, which are made of various building materials. On the basis of experimental studies, regression dependences of the adhesion of urban dust on different vertical surfaces from random determining factors were obtained. Thus, by studying the regularities of pollution of urban environment objects, made of various building materials, it is possible to achieve their preservation, since they demonstrate the architectural and design features of various historical periods of the country's development
Primary gamma ray selection in a hybrid timing/imaging Cherenkov array
This work is a methodical study on hybrid reconstruction techniques for
hybrid imaging/timing Cherenkov observations. This type of hybrid array is to
be realized at the gamma-observatory TAIGA intended for very high energy
gamma-ray astronomy (>30 TeV). It aims at combining the cost-effective
timing-array technique with imaging telescopes. Hybrid operation of both of
these techniques can lead to a relatively cheap way of development of a large
area array. The joint approach of gamma event selection was investigated on
both types of simulated data: the image parameters from the telescopes, and the
shower parameters reconstructed from the timing array. The optimal set of
imaging parameters and shower parameters to be combined is revealed. The cosmic
ray background suppression factor depending on distance and energy is
calculated. The optimal selection technique leads to cosmic ray background
suppression of about 2 orders of magnitude on distances up to 450 m for
energies greater than 50 TeV.Comment: 4 pages, 5 figures; proceedings of the 19th International Symposium
on Very High Energy Cosmic Ray Interactions (ISVHECRI 2016
Estimation of intraband and interband relative coupling constants from temperature dependences of the order parameter for two-gap superconductors
We present temperature dependences of the large and the small superconducting
gaps measured directly by SnS-Andreev spectroscopy in various Fe-based
superconductors and MgB. The experimental are well-fitted
with a two-gap model based on Moskalenko and Suhl system of equations
(supplemented with a BCS-integral renormalization). From the the fitting
procedure, we estimate the key attribute of superconducting state \textemdash
relative electron-boson coupling constants and eigen BCS-ratios for both
condensates. Our results evidence for a driving role of a strong intraband
coupling in the bands with the large gap, whereas interband coupling is rather
weak for all the superconductors under study.Comment: 7 pages, 5 figures, accepted to J. Supercond. Novel Mag
Hamiltonian formalism in Friedmann cosmology and its quantization
We propose a Hamiltonian formalism for a generalized
Friedmann-Roberson-Walker cosmology model in the presence of both a variable
equation of state (EOS) parameter and a variable cosmological constant
, where is the scale factor. This Hamiltonian system containing
1 degree of freedom and without constraint, gives Friedmann equations as the
equation of motion, which describes a mechanical system with a variable mass
object moving in a potential field. After an appropriate transformation of the
scale factor, this system can be further simplified to an object with constant
mass moving in an effective potential field. In this framework, the
cold dark matter model as the current standard model of cosmology corresponds
to a harmonic oscillator. We further generalize this formalism to take into
account the bulk viscosity and other cases. The Hamiltonian can be quantized
straightforwardly, but this is different from the approach of the
Wheeler-DeWitt equation in quantum cosmology.Comment: 7 pages, no figure; v2: matches the version accepted by PR
ΠΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΈΠΎΠ½ΠΈΠ·Π°ΡΠΈΠΎΠ½Π½ΡΡ ΠΈ ΡΠΌΠΈΡΡΠΈΠΎΠ½Π½ΡΡ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² Π² Π²ΡΡΠΎΠΊΠΎΠ²ΠΎΠ»ΡΡΠ½ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎ-ΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠ΅ Ρ Ρ ΠΎΠ»ΠΎΠ΄Π½ΡΠΌ ΠΊΠ°ΡΠΎΠ΄ΠΎΠΌ ΠΈ ΠΈΠΌΠΏΡΠ»ΡΡΠ½ΡΠΌ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠΎΠΌ ΠΈΠΎΠ½ΠΎΠ²
Π ΠΎΠ·ΡΠΎΠ±Π»Π΅Π½ΠΎ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ½Ρ ΠΌΠΎΠ΄Π΅Π»Ρ Π²ΠΈΡΠΎΠΊΠΎΠ²ΠΎΠ»ΡΡΠ½ΠΎΡ Π΅Π»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎ-ΡΠΎΠ½Π½ΠΎΡ ΡΠΈΡΡΠ΅ΠΌΠΈ Π½ΠΈΠ·ΡΠΊΠΎΠ³ΠΎ ΡΠΈΡΠΊΡ Π· Ρ
ΠΎΠ»ΠΎΠ΄Π½ΠΈΠΌ ΠΊΠ°ΡΠΎΠ΄ΠΎΠΌ ΡΠ° ΡΠΌΠΏΡΠ»ΡΡΠ½ΠΈΠΌ ΠΏΠ»Π°Π·ΠΌΠΎΠ²ΠΈΠΌ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠΎΠΌ ΡΠΎΠ½ΡΠ², ΡΠΎΠ·ΠΌΡΡΠ΅Π½ΠΈΠΌ Π·Π° Π°Π½ΠΎΠ΄ΠΎΠΌ. ΠΠΎΠ΄Π΅Π»Ρ ΠΎΡΠ½ΠΎΠ²Π°Π½Π° Π½Π° ΡΠΈΡΡΠ΅ΠΌΡ ΠΊΡΠ½Π΅ΡΠΈΡΠ½ΠΈΡ
ΡΡΠ²Π½ΡΠ½Ρ, ΡΠΊΡ ΠΎΠΏΠΈΡΡΡΡΡ ΡΠ°ΡΠΎΠ²Ρ Π΄ΠΈΠ½Π°ΠΌΡΠΊΡ ΡΠΎΠ½ΡΠ·Π°ΡΡΠΉΠ½ΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠ² Π·Π° ΡΡΠ°ΡΡΡ Π΅Π»Π΅ΠΊΡΡΠΎΠ½ΡΠ², ΡΠΎΠ½ΡΠ² ΡΠ° Π½Π΅ΠΉΡΡΠ°Π»ΡΠ² ΠΏΡΡΠ»Ρ ΠΏΠ΅ΡΠ΅Π·Π°ΡΡΠ΄ΠΆΠ΅Π½Π½Ρ ΡΠΎΠ½ΡΠ² Ρ ΠΏΠ»ΠΎΡΠΊΠΎΠΌΡ ΠΌΡΠΆΠ΅Π»Π΅ΠΊΡΡΠΎΠ΄Π½ΠΎΠΌΡ ΠΏΡΠΎΠΌΡΠΆΠΊΡ Ρ Π΅ΠΌΡΡΡΠΉΠ½ΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠ² Π½Π° Π΅Π»Π΅ΠΊΡΡΠΎΠ΄Π°Ρ
, Π²ΠΊΠ»ΡΡΠ°ΡΡΠΈ Π²ΡΠ΄Π±ΠΈΡΡΡ ΡΠ²ΠΈΠ΄ΠΊΠΈΡ
Π°ΡΠΎΠΌΡΠ² Π²ΡΠ΄ ΠΊΠ°ΡΠΎΠ΄Π° Ρ Π΅Π»Π΅ΠΊΡΡΠΎΠ½ΡΠ² Π²ΡΠ΄ Π°Π½ΠΎΠ΄Π°. Π§ΠΈΡΠ»ΠΎΠ²Ρ ΡΠΎΠ·ΡΠ°Ρ
ΡΠ½ΠΊΠΈ
Π΄Π°Π»ΠΈ Π·ΠΌΠΎΠ³Ρ Π²ΠΈΡΠ²ΠΈΡΠΈ Ρ Π΄ΠΎΡΠ»ΡΠ΄ΠΈΡΠΈ ΡΠ΅ΠΆΠΈΠΌΠΈ Π½Π΅ΡΠ°ΠΌΠΎΡΡΡΠΉΠ½ΠΎΠ³ΠΎ Ρ ΡΠ°ΠΌΠΎΡΡΡΠΉΠ½ΠΎΠ³ΠΎ ΡΠΎΠ·ΡΡΠ΄ΡΠ², ΡΠ½ΡΡΡΠΉΠΎΠ²Π°Π½ΠΈΡ
ΡΠΌΠΏΡΠ»ΡΡΠ½ΠΎΡ ΡΠ½ΠΆΠ΅ΠΊΡΡΡΡ ΡΠΎΠ½ΡΠ² Π· Π±ΠΎΠΊΡ Π°Π½ΠΎΠ΄Π° ΠΏΡΠΈ ΡΠΈΡΠΊΠ°Ρ
Π³Π°Π·Ρ Π²ΡΠ΄ΠΏΠΎΠ²ΡΠ΄Π½ΠΎ Π½ΠΈΠΆΡΠ΅ Ρ Π²ΠΈΡΠ΅ Π΄Π΅ΡΠΊΠΎΠ³ΠΎ ΠΊΡΠΈΡΠΈΡΠ½ΠΎΠ³ΠΎ Π·Π½Π°ΡΠ΅Π½Π½Ρ. ΠΠ»Ρ ΠΏΡΠ΄ΡΡΠΈΠΌΠΊΠΈ Π½Π΅ΡΠ°ΠΌΠΎΡΡΡΠΉΠ½ΠΎΠ³ΠΎ ΡΠΎΠ·ΡΡΠ΄Ρ Π½Π΅ΠΎΠ±Ρ
ΡΠ΄Π½ΠΈΠΉ ΠΏΠΎΡΡΡΠΉΠ½ΠΎ ΠΏΡΠ°ΡΡΡΡΠΈΠΉ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡ ΡΠΎΠ½ΡΠ². ΠΠ΅Π½Π΅ΡΠ°ΡΠΎΡ ΡΠΎΠ½ΡΠ² ΠΌΠΎΠΆΠ½Π° Π²ΡΠ΄ΠΊΠ»ΡΡΠ°ΡΠΈ ΠΏΡΡΠ»Ρ ΡΠ½ΡΡΡΡΠ²Π°Π½Π½Ρ ΡΠ°ΠΌΠΎΡΡΡΠΉΠ½ΠΎΠ³ΠΎ ΡΠΎΠ·ΡΡΠ΄Ρ, Π°Π»Π΅ ΡΡΠΈΠ²Π°Π»ΡΡΡΡ ΠΏΠ΅ΡΠ΅Ρ
ΡΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡ
Π²ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½Π½Ρ ΡΡΠΎΠ³ΠΎ ΡΠΎΠ·ΡΡΠ΄Ρ ΠΌΠΎΠΆΠ½Π° ΡΠΊΠΎΡΠΎΡΠΈΡΠΈ Π·Π±ΡΠ»ΡΡΠ΅Π½Π½ΡΠΌ ΡΡΠ»ΡΠ½ΠΎΡΡΡ ΡΡΡΡΠΌΡ ΡΠΎΠ½ΡΠ² ΡΠ½ΠΆΠ΅ΠΊΡΡΡ Ρ ΡΡΠΈΠ²Π°Π»ΠΎΡΡΡ ΡΠΌΠΏΡΠ»ΡΡΡ ΡΠ½ΠΆΠ΅ΠΊΡΡΡ. ΠΠΈΠ·Π½Π°ΡΠ΅Π½ΠΎ ΡΠΎΠ·ΠΏΠΎΠ΄ΡΠ»ΠΈ Π·Π° ΡΠ²ΠΈΠ΄ΠΊΠΎΡΡΡΠΌΠΈ Ρ Π΅Π½Π΅ΡΠ³ΡΡΠΌΠΈ ΠΏΠΎΡΠΎΠΊΡΠ² Π²ΠΈΡΠΎΠΊΠΎΠ΅Π½Π΅ΡΠ³Π΅ΡΠΈΡΠ½ΠΈΡ
ΡΠ°ΡΡΠΈΠ½ΠΎΠΊ, ΡΠΎ ΠΉΠ΄ΡΡΡ Π½Π° Π΅Π»Π΅ΠΊΡΡΠΎΠ΄ΠΈ, Ρ Π΄ΠΈΠ½Π°ΠΌΡΠΊΡ Π·ΠΌΡΠ½ΠΈ Π²Π΅Π»ΠΈΡΠΈΠ½ΠΈ ΡΠΈΡ
ΠΏΠΎΡΠΎΠΊΡΠ² Ρ ΡΠ°ΡΡ Π² ΡΡΠ·Π½ΠΈΡ
ΠΏΠ΅ΡΠ΅ΡΡΠ·Π°Ρ
ΠΌΡΠΆΠ΅Π»Π΅ΠΊΡΡΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΌΡΠΆΠΊΡ. ΠΡΡΠΈΠΌΠ°Π½Ρ Π΄Π°Π½Ρ Π²ΠΈΠΊΠΎΡΠΈΡΡΠΎΠ²ΡΡΡΡΡΡ ΠΏΡΠΈ ΡΠΎΠ·ΡΠΎΠ±Π»Π΅Π½Π½Ρ ΡΠΌΠΏΡΠ»ΡΡΠ½ΠΈΡ
Π΅Π»Π΅ΠΊΡΡΠΎΠ½Π½ΠΈΡ
ΡΠ° ΡΠΎΠ½Π½ΠΈΡ
Π΄ΠΆΠ΅ΡΠ΅Π» Ρ ΠΏΡΠΈΡΡΡΠΎΡΠ² ΡΠ΅ΡΠΌΠΎΡΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΎΡΠ°Π΄ΠΆΠ΅Π½Π½Ρ ΠΌΠ°ΡΠ΅ΡΡΠ°Π»ΡΠ², Π·ΠΎΠΊΡΠ΅ΠΌΠ° Π΄Π»Ρ Π²ΠΈΡΠΎΠ±Π½ΠΈΡΡΠ²Π° Π΅Π»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΡΡΠ½ΠΈΡ
ΠΌΠ΅ΡΠ°ΠΌΠ°ΡΠ΅ΡΡΠ°Π»ΡΠ².This paper develops the mathematical model of high-voltage low-pressure electron-ion system with a cold cathode and a pulse plasma ion generator disposed behind an anode. The model is based on kinetic equations describing time dynamics of ionization processes in the plane electrode gap with participation of electrons, ions and neutral species after ion charge exchange, as well as electrode emission processes, including reflection of atoms from cathode and electrons from anode. Numerical calculations allowed revealing and studying regimes of non-self-maintained and self-maintained discharges initiated by pulse injection of ions from the anode at gas pressures, accordingly, below and above some critical value. Continuously operating ion generator is needed to maintain the non-self-maintained discharge. The ion generator may be switched off after initiating the self-maintained discharge but duration of transient process of establishing this discharge can be shorted by increase of injected ion current density and injection pulse duration. Velocity and energy distributions of flows of high-energy particles going to the electrodes and time dynamics of variation of these flows are determined in different sections of the electrode gap. The obtained data is used for developing pulse electron and ion sources as well as of devices for thermo-ion deposition of materials in particular for manufacturing electromagnetic metamaterials.Π Π°Π·ΡΠ°Π±ΠΎΡΠ°Π½Π° ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ Π²ΡΡΠΎΠΊΠΎΠ²ΠΎΠ»ΡΡΠ½ΠΎΠΉ ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΠΎ-ΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΡ Π½ΠΈΠ·ΠΊΠΎΠ³ΠΎ Π΄Π°Π²Π»Π΅Π½ΠΈΡ Ρ Ρ
ΠΎΠ»ΠΎΠ΄Π½ΡΠΌ ΠΊΠ°ΡΠΎΠ΄ΠΎΠΌ ΠΈ ΠΈΠΌΠΏΡΠ»ΡΡΠ½ΡΠΌ ΠΏΠ»Π°Π·ΠΌΠ΅Π½Π½ΡΠΌ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡΠΎΠΌ ΠΈΠΎΠ½ΠΎΠ², ΡΠ°ΡΠΏΠΎΠ»ΠΎΠΆΠ΅Π½Π½ΡΠΌ Π·Π° Π°Π½ΠΎΠ΄ΠΎΠΌ. ΠΠΎΠ΄Π΅Π»Ρ ΠΎΡΠ½ΠΎΠ²Π°Π½Π° Π½Π° ΡΠΈΡΡΠ΅ΠΌΠ΅ ΠΊΠΈΠ½Π΅ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΉ, ΠΎΠΏΠΈΡΡΠ²Π°ΡΡΠΈΡ
Π²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΡ ΠΈΠΎΠ½ΠΈΠ·Π°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² Ρ ΡΡΠ°ΡΡΠΈΠ΅ΠΌ ΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΎΠ², ΠΈΠΎΠ½ΠΎΠ² ΠΈ Π½Π΅ΠΉΡΡΠ°Π»ΠΎΠ² ΠΏΠΎΡΠ»Π΅ ΠΏΠ΅ΡΠ΅Π·Π°ΡΡΠ΄ΠΊΠΈ ΠΈΠΎΠ½ΠΎΠ² Π² ΠΏΠ»ΠΎΡΠΊΠΎΠΌ ΠΌΠ΅ΠΆΡΠ»Π΅ΠΊΡΡΠΎΠ΄Π½ΠΎΠΌ ΠΏΡΠΎΠΌΠ΅ΠΆΡΡΠΊΠ΅ ΠΈ ΡΠΌΠΈΡΡΠΈΠΎΠ½Π½ΡΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² Π½Π° ΡΠ»Π΅ΠΊΡΡΠΎΠ΄Π°Ρ
, Π²ΠΊΠ»ΡΡΠ°Ρ ΠΎΡΡΠ°ΠΆΠ΅Π½ΠΈΠ΅ Π±ΡΡΡΡΡΡ
Π°ΡΠΎΠΌΠΎΠ² ΠΎΡ ΠΊΠ°ΡΠΎΠ΄Π° ΠΈ ΡΠ»Π΅ΠΊΡΡΠΎΠ½ΠΎΠ² ΠΎΡ Π°Π½ΠΎΠ΄Π°. Π§ΠΈΡΠ»Π΅Π½Π½ΡΠ΅ ΡΠ°ΡΡΠ΅ΡΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΠ»ΠΈ Π²ΡΡΠ²ΠΈΡΡ ΠΈ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΡ ΡΠ΅ΠΆΠΈΠΌΡ Π½Π΅ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΠΈ ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ°Π·ΡΡΠ΄ΠΎΠ², ΠΈΠ½ΠΈΡΠΈΠΈΡΡΠ΅ΠΌΡΡ
ΠΈΠΌΠΏΡΠ»ΡΡΠ½ΠΎΠΉ ΠΈΠ½ΠΆΠ΅ΠΊΡΠΈΠ΅ΠΉ ΠΈΠΎΠ½ΠΎΠ² ΡΠΎ ΡΡΠΎΡΠΎΠ½Ρ Π°Π½ΠΎΠ΄Π° ΠΏΡΠΈ Π΄Π°Π²Π»Π΅Π½ΠΈΡΡ
Π³Π°Π·Π° ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²Π΅Π½Π½ΠΎ Π½ΠΈΠΆΠ΅ ΠΈ Π²ΡΡΠ΅ Π½Π΅ΠΊΠΎΡΠΎΡΠΎΠ³ΠΎ ΠΊΡΠΈΡΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ Π·Π½Π°ΡΠ΅Π½ΠΈΡ. ΠΠ»Ρ ΠΏΠΎΠ΄Π΄Π΅ΡΠΆΠ°Π½ΠΈΡ Π½Π΅ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ°Π·ΡΡΠ΄Π° Π½Π΅ΠΎΠ±Ρ
ΠΎΠ΄ΠΈΠΌ ΠΏΠΎΡΡΠΎΡΠ½Π½ΠΎ ΡΠ°Π±ΠΎΡΠ°ΡΡΠΈΠΉ Π³Π΅Π½Π΅ΡΠ°ΡΠΎΡ ΠΈΠΎΠ½ΠΎΠ². ΠΠ΅Π½Π΅ΡΠ°ΡΠΎΡ ΠΈΠΎΠ½ΠΎΠ² ΠΌΠΎΠΆΠ½ΠΎ ΠΎΡΠΊΠ»ΡΡΠ°ΡΡ ΠΏΠΎΡΠ»Π΅ ΠΈΠ½ΠΈΡΠΈΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΠΎΠ³ΠΎ ΡΠ°Π·ΡΡΠ΄Π°, Π½ΠΎ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΡ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΡΠ΅ΡΡΠ° ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ ΡΡΠΎΠ³ΠΎ ΡΠ°Π·ΡΡΠ΄Π° ΠΌΠΎΠΆΠ½ΠΎ ΡΠΎΠΊΡΠ°ΡΠΈΡΡ ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ΠΌ ΠΏΠ»ΠΎΡΠ½ΠΎΡΡΠΈ ΡΠΎΠΊΠ° ΠΈΠ½ΠΆΠ΅ΠΊΡΠΈΡΡΠ΅ΠΌΡΡ
ΠΈΠΎΠ½ΠΎΠ² ΠΈ Π΄Π»ΠΈΡΠ΅Π»ΡΠ½ΠΎΡΡΠΈ ΠΈΠΌΠΏΡΠ»ΡΡΠ° ΠΈΠ½ΠΆΠ΅ΠΊΡΠΈΠΈ. ΠΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Ρ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ ΠΏΠΎ ΡΠΊΠΎΡΠΎΡΡΡΠΌ ΠΈ ΡΠ½Π΅ΡΠ³ΠΈΡΠΌ ΠΏΠΎΡΠΎΠΊΠΎΠ² Π²ΡΡΠΎΠΊΠΎΡΠ½Π΅ΡΠ³Π΅ΡΠΈΡΠ½ΡΡ
ΡΠ°ΡΡΠΈΡ, ΠΈΠ΄ΡΡΠΈΡ
Π½Π° ΡΠ»Π΅ΠΊΡΡΠΎΠ΄Ρ, ΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠ° ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ Π²Π΅Π»ΠΈΡΠΈΠ½Ρ ΡΡΠΈΡ
ΠΏΠΎΡΠΎΠΊΠΎΠ² Π²ΠΎ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ Π² ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠ΅ΡΠ΅Π½ΠΈΡΡ
ΠΌΠ΅ΠΆΡΠ»Π΅ΠΊΡΡΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΏΡΠΎΠΌΠ΅ΠΆΡΡΠΊΠ°. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ Π΄Π°Π½Π½ΡΠ΅ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡΡΡΡ ΠΏΡΠΈ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠ΅ ΠΈΠΌΠΏΡΠ»ΡΡΠ½ΡΡ
ΡΠ»Π΅ΠΊΡΡΠΎΠ½Π½ΡΡ
ΠΈ ΠΈΠΎΠ½Π½ΡΡ
ΠΈΡΡΠΎΡΠ½ΠΈΠΊΠΎΠ² ΠΈ ΡΡΡΡΠΎΠΉΡΡΠ² ΡΠ΅ΡΠΌΠΎΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΎΡΠ°ΠΆΠ΄Π΅Π½ΠΈΡ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ², Π² ΡΠ°ΡΡΠ½ΠΎΡΡΠΈ Π΄Π»Ρ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ΠΈΡ ΡΠ»Π΅ΠΊΡΡΠΎΠΌΠ°Π³Π½ΠΈΡΠ½ΡΡ
ΠΌΠ΅ΡΠ°ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ²
Evidence of a multiple boson emission in SmThOFeAs
We studied a reproducible fine structure observed in dynamic conductance
spectra of Andreev arrays in SmThOFeAs superconductors with various
thorium concentrations () and critical temperatures \,K. This structure is unambiguously caused by a multiple boson emission
(of the same energy) during the process of multiple Andreev reflections. The
directly determined energy of the bosonic mode reaches \,meV for optimal compound. Within the studied range of , this
energy as well as the large and the small superconducting
gaps, nearly scales with critical temperature with the characteristic ratio
(and ,
correspondingly) resembling the expected energy of spin
resonance and spectral density enhancement in and states,
respectively.Comment: 10 pages, 4 figure
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