Phase Transitions between Magnetic Incommensurate States of Terbium Manganite in Magnetic Field

2014 ◽  
Vol 215 ◽  
pp. 71-76 ◽  
Author(s):  
Irina E. Chupis ◽  
Helen A. Kovtun
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Phase Transitions ◽  
Calculated Phase Diagram ◽  
Electric Polarization ◽  
Spin States ◽  
Magnetic Anisotropy Energy ◽  
Spin Cycloid ◽  
Modulation Vector ◽  
Good Agreement

Phase transitions between incommensurate spin states in ferroelectromagnet TbMnO3 in magnetic field along the modulation vector are phenomenologically analyzed. It is shown that the competition between different terms of the fourth order in magnetic anisotropy energy is a reason of the reorientation of spin-cycloid plane and electric polarization by 900 (polarization flop). Calculated phase diagram is in a good agreement with experimental data.

scholarly journals Mechanics of magnetic fluid active element in strong magnetic field

2018 ◽  
Vol 185 ◽  
pp. 09005
Author(s):  
V.M. Polunin ◽  
P.A. Ryapolov ◽  
E.V. Sheldeshova
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Saturation Magnetization ◽  
Strong Magnetic Field ◽  
Magnetic Fluid ◽  
Active Element ◽  
Magnetic Levitation ◽  
Static Displacement ◽  
Temporal Dependence ◽  
Good Agreement

Measurements and theoretical analysis of the processes of static displacement and oscillations of the magnetic fluid column confined by magnetic levitation in a strong magnetic field in a horizontally placed tube are carried out. The calculations of the saturation magnetization, made on the basis of the obtained results of the displacement and the oscillation frequency for the sample of the magnetic fluid under study, are in good agreement with the experimental data. The described technique is of interest when studying saturation magnetization, magnetophoresis, aggregation of nanoparticles and their temporal dependence in magnetic colloids.

Magnetized liquid 3He at finite temperature: A variational calculation approach

2016 ◽  
Vol 30 (22) ◽  
pp. 1650129 ◽  
Author(s):  
Gholam Hossein Bordbar ◽  
Mohammad Taghi Mohammadi Sabet
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Correlation Function ◽  
Finite Temperature ◽  
Spin Correlation ◽  
Energy Functional ◽  
Variational Calculation ◽  
A Value ◽  
Dependent Correlation ◽  
Good Agreement

Using the spin-dependent (SD) and spin-independent (SI) correlation functions, we have investigated the properties of liquid [Formula: see text] in the presence of magnetic field at finite temperature. Our calculations have been done using the variational method based on cluster expansion of the energy functional. Our results show that the low field magnetic susceptibility obeys Curie law at high temperatures. This behavior is in a good agreement with the experimental data as well as the molecular field theory results in which the spin dependency has been introduced in correlation function. Reduced susceptibility as a function of temperature as well as reduced temperature has been also investigated, and again we have seen that the spin-dependent correlation function leads to a good agreement with the experimental data. The Landau parameter, [Formula: see text], has been calculated, and for this parameter, a value about [Formula: see text] has been found in the case of spin–spin correlation. In the case of spin-independent correlation function, this value is about [Formula: see text]. Therefore, inclusion of spin dependency in the correlation function leads to a more compatible value of [Formula: see text] with experimental data. The magnetization and susceptibility of liquid [Formula: see text] have also been investigated as a function of magnetic field. Our results show a downward curvature in magnetization of system with spin-dependent correlation for all densities and relevant temperatures. A metamagnetic behavior has been observed as a maximum in susceptibility versus magnetic field, when the spin–spin correlation has been considered. This maximum occurs at [Formula: see text] for all densities and temperatures. This behavior has not been observed in the case of spin-independent correlation function.

Magnetic Properties of PrхY1-xFe3(BO3)4

2015 ◽  
Vol 233-234 ◽  
pp. 360-363
Author(s):  
A.I. Pankrats ◽  
A.A. Demidov ◽  
D.A. Velikanov ◽  
V.I. Tugarinov ◽  
V.L. Temerov
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Field Model ◽  
Field Approximation ◽  
Magnetization Curves ◽  
Extensive Experimental Data ◽  
Theory And Experiment ◽  
Good Agreement

The magnetic properties of trigonal PrxY1-xFe3(BO3)4 compound have been investigated. Anomalies on the magnetization curves induced by a magnetic field are observed for each composition. The calculations were performed using a molecular-field approximation and a crystal-field model for the rare-earth subsystem. Extensive experimental data on the magnetic properties of PrxY1-xFe3(BO3)4 have been interpreted and good agreement between theory and experiment has been achieved.

CALCULATIONS OF THE ZEEMAN SPLITTING FOR PLATINUM GROUP METALS AND NOBLE METALS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 271-274 ◽  
Author(s):  
ANDERS HJELM
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Electronic Structures ◽  
Noble Metals ◽  
Zeeman Splitting ◽  
Platinum Group Metals ◽  
Exchange Correlation ◽  
Orbital Magnetism ◽  
Platinum Group ◽  
Good Agreement

The electronic structures for Rh, Pd, Ir, Pt, Cu, Ag and Au are calculated including the effects of an external magnetic field, using the LMTO — ASA method. The field is included self consistently by adding the Zeeman term to the Hamiltonian in the variational step. The Zeeman splitting of cyclotron orbits on the Fermi surface as well as bulk susceptibilities are calculated for various exchange — correlation potentials. For the platinum group metals good agreement with experiments is found but for the noble metals effects creating orbital magnetism are exaggerated and the calculated susceptibilities as well as the cyclotron orbit Zeeman splitting are larger than the experimental data.

scholarly journals Low-Temperature Properties of Compensated Ge Films Used for Cryogenic Thermometers

2002 ◽  
Vol 719 ◽  
Author(s):  
V. F. Mitin ◽  
V. V. Kholevchuk ◽  
V. K. Dugaev ◽  
M. Vieira
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Low Temperature ◽  
Theoretical Study ◽  
Temperature Sensors ◽  
Temperature Resistance ◽  
Gaas Substrates ◽  
Heavily Doped ◽  
Low Temperature Resistance ◽  
Good Agreement

AbstractLow temperature microsensors are designed for cryogenic applications. As a material for the sensors we use heavily doped compensated Ge films deposited on the semi-insulating GaAs substrates. We present the results of experimental and theoretical study of the low temperature resistance as a function of temperature and magnetic field for some models of temperature sensors. The computer simulations show a good agreement with experimental data.

Analysis of the peak position and linewidth as a function of temperature for the phase transitions in LiKSO4

2016 ◽  
Vol 30 (05) ◽  
pp. 1650016 ◽  
Author(s):  
H. Yurtseven ◽  
M. Kurt
Keyword(s):  
Experimental Data ◽  
Phase Transitions ◽  
Peak Position ◽  
Energy Model ◽  
Infrared Band ◽  
Self Energy ◽  
External Mode ◽  
Temperature Dependences ◽  
Successive Phase ◽  
Good Agreement

Analysis of the peak position and the linewidths of various infrared modes is performed at high (300–850 K) and low (1.5–300 K) temperatures using the experimental data from the literature for LiKSO4 which exhibits a sequence of phase transitions. The temperature dependences of the frequency and the linewidth which are derived from the anharmonic self-energy are fitted to the observed peak positions and the linewidths of the S–O stretching modes (internal [Formula: see text] modes at 1135 cm[Formula: see text] and at 1180 cm[Formula: see text]), peak position of the S–O bending [Formula: see text] (internal) modes, the peak position and the linewidth of the Li mode at 429 cm[Formula: see text] (external mode), and of the infrared band at 363 cm[Formula: see text] for LiKSO4. Our calculated peak positions and the linewidths, which are in good agreement with the observed data show that the anharmonic self-energy model describes adequately the observed behavior of the successive phase transitions in LiKSO4.

scholarly journals Prediction of phase equilibria in the In-Sb-Pb system

2008 ◽  
Vol 73 (3) ◽  
pp. 377-384
Author(s):  
Dusko Minic ◽  
Dragan Manasijevic ◽  
Dragana Zivkovic ◽  
Nada Strbac ◽  
Zvonimir Stankovic
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Phase Equilibria ◽  
Binary Systems ◽  
Equilibrium Phase ◽  
Calculated Phase Diagram ◽  
Equilibrium Phase Diagram ◽  
Thermodynamic Prediction ◽  
Calculated Liquidus ◽  
Good Agreement

Binary thermodynamic data, successfully used for phase diagram calculations of the binary systems In-Sb, Pb-Sb and In-Pb, were used for the prediction of the phase equilibria in the ternary In-Sb-Pb system. The predicted equilibrium phase diagram of the vertical Pb-InSb section was compared with the results of differential thermal analysis (DTA) and optical microscopy. The calculated phase diagram of the isothermal section at 300 ?C was compared with the experimentally (SEM, EDX) determined composition of phases in the chosen alloys after annealing. Very good agreement between the binary-based thermodynamic prediction and the experimental data was found in all cases. The calculated liquidus projection of the ternary In-Sb-Pb system is also presented.

Magnetorefractive Effect in Doped La1-xKxMnO3 Thin Films

2014 ◽  
Vol 215 ◽  
pp. 163-166
Author(s):  
Elena A. Gan’shina ◽  
Yurii P. Sukhorukov ◽  
Andrey V. Telegin ◽  
Vladimir D. Bessonov ◽  
Andrey R. Kaul
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Thin Films ◽  
Kerr Effect ◽  
The Other ◽  
Infrared Range ◽  
Epitaxial Thin Films ◽  
Effect Theory ◽  
Magnetorefractive Effect ◽  
Good Agreement

Influence the deposition of La3+ ions by monovalent K+ ions on magnetorefractive effect on magnetoreflaction and magnetotransmission modes in the infrared range for La1-xKxMnO3 epitaxial thin-films (х=0.05, 0.10, 0.15 и 0.18) has been studied. It has been shown that the magnetorefractive effect, transversal Kerr effect and magnetoresistance reach the maximum in optimally doped films at highest Curie temperature. The good agreement between calculated in framework of magnetorefractive effect theory and experimental data takes place only for optimally doped films, with potassium concentrations of 15 % and 18 %. At the other doping levels the films become charge and magnetic inhomogeneous. Magnetic and charge homogeneity influence strongly on magnetooptical effects in films. The resonance-like lines in magnetoreflection spectra of films are connected with the shifting of reflection minimum before the phonon bands under a magnetic field has been observed.

Isothermal Dehydriding Kinetics of Mg2NiH4 Prepared under an External Magnetic Field

2013 ◽  
Vol 785-786 ◽  
pp. 638-641
Author(s):  
Jing Liu
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Solid Solution ◽  
External Magnetic Field ◽  
Magnetic Intensity ◽  
Hydrogen Atoms ◽  
Kinetics Of ◽  
Rate Controlling Step ◽  
Diffusion Of Hydrogen ◽  
Good Agreement

The Mg2NiH4hydrogen storage metal hydride was prepared by hydriding combustion synthesis under an external magnetic field. The dehydriding kinetics of the hydrides was measured under isotherm condition. The kinetics mechanism of Mg2NiH4materials was analyzed by model. The calculated results show that the theoretical calculation and the experimental data can reach a good agreement. The rate-controlling step is the diffusion of hydrogen atoms in the solid solution. The dehydriding activation energies of the sample synthesized under the optimized magnetic intensity of 6 T is 104 kJ/mol H2.

Electron transport properties of InP

1980 ◽  
Vol 58 (7) ◽  
pp. 923-930 ◽  
Author(s):  
H. J. Lee ◽  
J. Basinski ◽  
L. Y. Juravel ◽  
J. C. Woolley
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Thermoelectric Power ◽  
Room Temperature ◽  
Theoretical Calculations ◽  
Scattering Parameters ◽  
Electron Transport Properties ◽  
Predicted Values ◽  
Experimental Values ◽  
Good Agreement

Measurements of electrical conductivity σ and Hall coefficient RH have been made as a function of temperature in the range room temperature to 250 °C and as a function of magnetic field up to 3.2 T on single crystal n-type samples of InP with carrier concentrations in the range 3.5 × 1021 to 1.2 × 1024 m−3. Theoretical calculations of σ and RH have been made using the method of Fletcher and Butcher and the resulting values fitted to the experimental data by using various scattering parameters as adjustable. The parameters so obtained have then been used to predict further magnetoresistance values and values of thermoelectric power and Nernst–Ettingshausen coefficient. The predicted values of magnetoresistance and thermoelectric power show good agreement with experimental values but not those of the Nernst–Ettingshausen coefficient, possibly due to experimental problems.

Sign in / Sign up

Export Citation Format

Share Document