共查询到20条相似文献,搜索用时 15 毫秒
1.
G. M. Abramova G. Petrakovskiy R. Zuberek A. Nabialek M. Boem V. Sokolov A. F. Bovina 《JETP Letters》2009,90(3):207-210
The magnetostriction of Fe
x
Mn1 − x
S (x = 0.27) single crystals in strong magnetic fields up to 120 kOe has been investigated. It has been found that the magnetostriction
reaches colossal values (±3 × 10−4) atypical of compounds of 3d elements. It has been found that the magnetostriction changes sign when varying temperature and magnetic field; this behavior
indicates an important role of the spin-phonon interactions in the formation of the magnetic order in solid solutions of iron-manganese
sulfides. 相似文献
2.
The capacitance and dielectric loss tangent of GdxMn1–xS (x ≤ 0.2) solid solutions have been measured at a frequency of 10 kHz without magnetic field and in a magnetic field of 8 kOe in the temperature range of 90–450 K. An increase in the permittivity and a dielectric loss maximum have been detected in the low-temperature region. It has been found that the temperature of the maximum of the imaginary part of the permittivity shifts to higher temperatures with increasing concentration. The magnetocapacitance effect has been revealed for two compositions. The dielectric loss has been described in the Debye model with “freezing” dipole moments and in the orbital-charge ordering model. 相似文献
3.
G. M. Abramova N. V. Volkov G. A. Petrakovskiĭ Y. Mita O. A. Bayukov D. A. Velikanov A. M. Vorotynov V. V. Sokolov A. F. Bovina 《JETP Letters》2007,86(6):371-374
Results of an experimental study of MnS, FeS, and Fe x Mn1?x S single crystals are presented. The phase composition, the lattice parameters, and the state of paramagnetic ions in Fe x Mn1?x S have been determined by x-ray diffraction analysis and Mössbauer spectroscopy. A sequence of transitions have been found in iron manganese sulfide with x = 0.29 at temperatures T 1 ≈ 25–50 K, T 2 ≈ 125 K, and T 3 ≈ 190 K with a change in kinetic properties and the formation of a metallic state at low temperatures T ≈ 2 K. The possibility of a Mott-Hubbard transition in Fe x Mn1?x S sulfides with variation of the composition and the temperature is discussed. 相似文献
4.
S. S. Aplesnin M. N. Sitnicov A. M. Panasevich A. I. Galyas O. V. Demidenko K. I. Yanushkevich 《Bulletin of the Russian Academy of Sciences: Physics》2016,80(11):1306-1309
Gd x Mn1–x Se (0 ≤ х ≤ 0.15) solid solutions are synthesized on the basis of manganese monoselenide. Their magnetic and electrical properties are studied in the temperature range of 80–900 K in magnetic fields up to 10 kOe. An FCC lattice with the Fm3m space group and antiferromagnetic ordering of the magnetic moments of manganese ions is found. A monotonic reduction in the Néel temperature and an increase in the effective magnetic moment along with the gadolinium concentration are observed. Anomalies in the temperature dependence of electrical resistivity and a shift in the temperatures of anomalies in a magnetic field are found. 相似文献
5.
O. B. Romanova S. S. Aplesnin A. M. Khar’kov V. V. Kretinin A. M. Zhivul’ko 《Physics of the Solid State》2018,60(9):1691-1697
The results of kinetic study of the Mn1 – xGdxSe chalcogenide solid solutions with different substitute concentrations (0 ≤ x ≤ 0.15) in the temperature range of 80–400 K are reported. The difference between the Hall constant and thermopower signs has been found. The electron-type conductivity determined from the Hall constant and hysteresis of the I–V characteristics have been explained by the existence of nanoareas with local electric polarizations. The sharp extrema observed in the temperature dependence of thermopower are explained by splitting of a narrow 4f subband by the crystal field. 相似文献
6.
A. I. Dmitriev R. B. Morgunov O. L. Kazakova Y. Tanimoto 《Journal of Experimental and Theoretical Physics》2009,108(6):985-991
Magnetic properties of Ge1 ? x Mn x (x = 0.02, 0.04, 0.08) thin films obtained by ion-implanting Mn+ ions into single-crystal Ge plates are investigated. The contributions of the subsystem of dispersed Mn2+ ions, Ge3Mn5 ferromagnetic clusters, and Mn-enriched ferromagnetic domains of Ge to the magnetic moment of Ge1 ? x Mn x films are distinguished. In the subsystem of dispersed Mn2+ ions in Ge1 ? x Mn x films at temperatures below 10 K, a spin-wave resonance is observed in the magnetically ordered state due to percolation ferromagnetism. It is established that, in the films with percolation ferromagnetism, the exchange integrals determined from static measurements correspond to those determined by dynamic measurements. 相似文献
7.
S. S. Aplesnin L. I. Ryabinkina O. B. Romanova O. N. Bandurina M. V. Gorev A. D. Balaev E. V. Eremin 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(7):965-967
The magnetization, resistance, permittivity, and thermal expansion coefficient of cation-substituted sulfides Co x Mn1 ? x S have been measured. The relationship between the magnetic, electric, and elastic subsystems of Co x Mn1 ? x S solid solutions is established and the features of physical properties characteristic of multiferroics, induced by orbital-charge ordering, are found. 相似文献
8.
S. S. Aplesnin L. I. Ryabinkina O. B. Romanova D. A. Velikanov A. D. Balaev D. A. Balaev K. I. Yanushkevich A. I. Galyas O. F. Demidenko O. N. Bandurina 《Journal of Experimental and Theoretical Physics》2008,106(4):765-772
We have studied the resistivity and thermoelectromotive force (thermo emf) in a temperature range of T = 80–1000 K, the magnetic susceptibility and magnetization in a temperature range of T = 4.2–300 K at an external magnetic field of up to 70 kOe, and the structural characteristics of Co x Mn1?x S sulfides (0 ≤ x ≤ 0.4). Anomalies in the transport properties of these compounds have been found in the temperature intervals ΔT 1 = 200–270 K and ΔT 2 = 530–670 K and at T 3 ~ T N. The temperature dependences of the magnetic susceptibility, magnetization, and resistivity, as well as the current-voltage characteristics, exhibit hysteresis. In the domain of magnetic ordering at temperatures below the Néel temperature (T N), the antiferromagnetic Co x Mn1?x S sulfides possess a spontaneous magnetic moment that is explained using a model of the orbital ordering of electrons in the t 2g bands. The influence of the cobalt-ion-induced charge ordering on the transport and magnetic properties of sulfides has been studied. The calculated values of the temperatures corresponding to the maxima of charge susceptibility, which are related to a competition between the on-site Coulomb interaction of holes in various subbands and their weak hybridization, agree well with the experimental data. 相似文献
9.
G. I. Makovetskiĭ A. I. Galyas O. F. Demidenko K. I. Yanushkevich L. I. Ryabinkina O. B. Romanova 《Physics of the Solid State》2008,50(10):1826-1829
This paper reports on the results of investigations into the structural, electrical, and thermoelectrical properties of sulfides Co x Mn1 ? x S (0 ≤ x ≤ 0.4) in the temperature range 80–950 K. It is established that the thermopower coefficient α decreases significantly with an increase in the cobalt concentration in the lattice of the α-MnS compound. The Co x Mn1 ? x S compounds with cobalt concentrations in the range 0 ≤ x ≤ 0.3 are semiconductors with hole conduction (α > 0), whereas the compound with x = 0.4 exhibits metallic conduction (α < 0). It is found that the band gap E g of the compounds under investigation varies in the range from 1.46 eV for α-MnS (x = 0) to 0.26 eV for Co x Mn1 ? x S (x = 0.4). 相似文献
10.
The magnetic structure of intermetallic compounds Ce2Fe17 − x
Mn
x
(0 ≤ x ≤ 3) was studied using neutron diffraction. The neutron diffraction patterns measured at 4.2 K contain satellites indicating
a modulated structure with the wave vector k = [0, 0, τ]. As the concentration x increases, the value of τ increases, while the average magnetic moment of Fe/Mn atoms decreases. A change in the magnitudes
of the average magnetic moment and wave vector k is explained by competition between exchange interactions at distances of nearest neighbor transition element atoms. 相似文献
11.
O. A. Savinskaya A. P. Nemudry A. N. Nadeev S. V. Tsybulya N. Z. Lyakhov 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(8):1053-1054
The structure of high-temperature SrFe1 − x
Mo
x
O3 − z
(0 ≤ x ≤ 0.5) phases was studied. Such studies are necessary to understand the mechanism of oxygen transport in membrane materials
used for high-temperature oxygen separation. 相似文献
12.
I. R. Nuriyev M. A. Mehrabova N. H. Hasanov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2018,12(3):504-506
Cd1–xMn x Se (х = 0.03) epitaxial films are produced by the molecular beam condensation method in a vacuum chamber with a residual pressure of 10–4 Pa on mica and glass substrates. It is established that at room temperature and at a substrate temperature of T = 573 K films of polycrystalline structure grow on the mica substrates, but films of both polycrystalline and amorphous structure grow on the glass substrates. It is shown that the polycrystalline Cd1–xMn x Se (х = 0.03) films, unlike the bulk crystals, have a sphalerite-type structure with a lattice parameter of a = 6.05 Å. Increasing the substrate temperature to 673 K leads to epitaxial growth with the direction [111]. Dark aggregates, observed on the film surface, are removed using a source of compensating Se vapors during the growth process. The optimal conditions for the production of structurally perfect epitaxial films are defined. 相似文献
13.
G. M. Abramova G. A. Petrakovskii D. A. Velikanov A. M. Vorotynov M. S. Molokeev Y. Mita V. V. Sokolov G. S. Patrin 《Physics of the Solid State》2012,54(2):293-297
The Cr
x
Mn1 − x
S single crystals have been synthesized based on manganese monosulfide as a result of cation substitution, and their magnetic
properties have been studied. It has been established that the Cr
x
Mn1 − x
S solid solutions with a face-centered cubic NaCl structure are formed in the concentration region 0 ≤ x < 0.3. The unit cell parameter of the solid solution decreases as the degree of substitution increases due to the variation
in the ionic radius of cations. These substances are antiferromagnets. An increase in the degree of cation substitution in
the Cr
x
Mn1 − x
S solid solutions is accompanied by a decrease in the number of 3d electrons in the d shell of manganese monosulfide and causes a decrease in the magnetic transition temperature from 149 K (x = 0) to 96 K (x = 0.29), which differs from previously known results. 相似文献
14.
Guo-Long Tan Min Wang Kai Wang Lin Zhang Xue-Feng Yu 《Journal of nanoparticle research》2011,13(11):5799-5807
Cd1−x
Mn
x
Te (x = 0, 0.1, 0.2) nanocrystals have been synthesized by mechanical alloying (MA) Cd, Mn, and Se elemental powders. XRD patterns
and HRTEM images confirmed the formation of cubic Cd1−x
Mn
x
Te nanocrystals. All the diffraction peaks from elemental Cd, Mn, and Te powders disappeared completely in those XRD patterns
of as-milled Cd1−x
Mn
x
Te nanocrystals for more than 20 h. When the MA process was carried out for 40 h, typical zinc blende structure diffraction
mode was exhibited in the XRD pattern. Subsequently, capping the surface of as-milled Cd1−x
Mn
x
Te nanocrystals with long chain trioctylphosphine/trioctylphosphine oxide/nitric acid (TOP/TOPO/NA) molecules has achieved
colorful dispersion solution, which shows similar optical properties to those CdTe nanocrystals prepared by wet chemical process.
The grain size is within the range of 2–8 nm for the capped Cd1−x
Mn
x
Te nanocrystals being ball milled for 40 h. The PL excitation peak red shifts to longer wavelength side with increasing Mn
concentration. Pure CdTe nanocrystals show ferromagnetism behavior at room temperature, the saturation magnetization value
and magnetic hysteresis loop increase with the content of substituting Mn ions within the Cd1−x
Mn
x
Te nanocrystals. 相似文献
15.
G. M. Abramova G. A. Petrakovskii V. V. Sokolov D. A. Velikanov A. M. Vorotynov A. F. Bovina A. A. Amirov A. M. Aliev L. N. Khanov G. S. Patrin 《Physics of the Solid State》2012,54(3):531-536
This paper reports on first results of the synthesis and study of the thermal, structural, electrical, resonance, and magnetic
properties of new sulfide materials Me
x
Mn1 − x
S (Me = Cu, 0 < x < 0.2) synthesized based on manganese monosulfide. The materials have a NaCl cubic structure at 300 K and undergo a concentration
metal-insulator transition with increasing degree of substitution and with varying temperature. The magnetic transition occurs
in the region of the heat capacity anomaly. The Néel temperature is slightly dependent on the copper concentration. The samples
with a high copper content exhibit metallic conduction at T < 260 K and semiconductor conduction at T > 260 K. 相似文献
16.
17.
The electronic structure and ground state parameters of B2 RuAl-based refractory alloys have been investigated in the framework of the density functional theory using the exact muffin-tin
orbital method in combination with the coherent potential approximation. It has been demonstrated that the number of states
at the Fermi level for the Ru1 − x
Me
x
Al alloys as a function of the alloying metal content has a minimum, which indicates a change in the Fermi surface topology
and the presence of specific features in the behavior of elastic constants. It has been concluded that the electronic structure
of the alloys can be described in terms of the rigid band model. The nonlinear variations of the lattice parameters of the
alloys has been explained. 相似文献
18.
A. V. Germanenko G. M. Minkov O. E. Rut A. A. Sherstobitov B. N. Zvonkov 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(2):219-222
The temperature dependence of the conductivity of the two-dimensional hole gas in an asymmetric GaAs/In x Ga1 ? x As/GaAs quantum well has been investigated. It is shown that fast spin relaxation leads to metallic-like behavior of the temperature dependence of the conductivity. 相似文献
19.
20.
G. S. Patrin V. V. Beletskiĭ N. V. Volkov D. A. Velikanov O. V. Zakieva 《Journal of Experimental and Theoretical Physics》2007,105(1):1-3
The results of experimental investigation of magnetic and electric properties of Fe1?x Dy x Si crystals are reported. It is shown that the magnitude and position of the anomaly observed in the temperature dependences of magnetization are controlled to a considerable extent by the external magnetic field. It is found that the introduction of Dy ions leads to a weak magnetoresistive effect. 相似文献