Pressure Induced AF - F - AF Magnetic Phase Transformations in Pd Substituted FeRh Compound

2012 ◽  
Vol 190 ◽  
pp. 299-302 ◽  
Author(s):  
A.M. Chirkova ◽  
A.S. Volegov ◽  
D.S. Neznakhin ◽  
E.A. Stepanova ◽  
N.V. Baranov
Keyword(s):  
Phase Transition ◽  
Critical Temperature ◽  
Hydrostatic Pressure ◽  
Curie Temperature ◽  
Phase Transformations ◽  
Magnetic Phase ◽  
Ambient Pressure ◽  
Phase Evolution

At ambient pressure, the Fe0.49(Rh1-xPdx)0.51 alloys with the Pd concentration within 0 < x < 0.12 exhibit an antiferromagnetic (AF) state below the critical temperature Tt, while above x = 0.12 the alloys have a ferromagnetic (F) order up to the Curie temperature TC 650 K. The temperature and field dependences of the magnetization in the alloys with x = 0.08; 0.13 were investigated under hydrostatic pressure up to 10 kbar. The application of pressure of about 8.5 kbar is observed to induce the F-AF phase transition in the ferromagnetically ordered compound with x = 0.13. The AF-F-AF phase evolution was revealed with increasing pressure in the AF-ordered alloy with x = 0.08.

scholarly journals Влияние гидрирования на структуру, магнитные и магнитокалоричеcкие свойства сплавов Tb-Dy-Co со структурой фаз Лавеса

2019 ◽  
Vol 61 (7) ◽  
pp. 1229
Author(s):  
И.С. Терёшина ◽  
Т.П. Каминская ◽  
В.Б. Чжан ◽  
Ю.А. Овченкова ◽  
А.С. Трушева ◽  
...  
Keyword(s):  
Phase Transition ◽  
Phase Composition ◽  
Curie Temperature ◽  
Magnetic Phase ◽  
Surface Topology ◽  
Magnetocaloric Properties ◽  
Structure Phase ◽  
State Changes ◽  
Ordered State ◽  
Comprehensive Study

A comprehensive study of the structure, phase composition, surface topology, magnetic and magnetocaloric properties of the compounds TbCo2, Tb0.3Dy0.7Co2 and the hydride with a low hydrogen content Tb0.3Dy0.7Co2H0.5 was carried out. The features of the structure at the micro- and nano- levels, as well as changes in the fundamental and functional properties during hydrogenation, were established. It was shown that the introduction of a small amount of hydrogen into the crystal lattice of the Tb0.3Dy0.7Co2 compound leads to an increase in both the Curie temperature and the magnetic moment on the cobalt atoms. The type of magnetic phase transition from a paramagnetic to a magnetically ordered state changes from the first (in the compound Tb0.3Dy0.7Co2) to the second (in TbCo2, Tb0.3Dy0.7Co2H0.5), which leads to a significant decrease in the magnitude of the magnetocaloric effect.

scholarly journals Pressure Induced Suppression to the Valence Change Transition in EuPdAs

2015 ◽  
Vol 2015 ◽  
pp. 1-4
Author(s):  
Baoxuan Li ◽  
Jianzhong Liu ◽  
Yufeng Li ◽  
Xiyu Zhu ◽  
Hai-Hu Wen
Keyword(s):  
Phase Transition ◽  
Magnetic Susceptibility ◽  
Hydrostatic Pressure ◽  
Ambient Pressure ◽  
Parent Phase ◽  
Magnetic Behavior ◽  
Iron Based Superconductors ◽  
Space Group ◽  
Iron Based ◽  
Valence Change

By applying a hydrostatic pressure, we have successfully suppressed the valence change transition in EuPdAs. The studied compound EuPdAs crystallizes in a P63/mmc space group. Through resistivity and magnetic susceptibility measurements, we find that EuPdAs shows a phase transition at 180 K and another transition below 10 K at ambient pressure, as was reported before. The overall transport and magnetic behavior is to some extent similar to that of the parent phase of iron based superconductors. With application of a hydrostatic pressure, the transition at 180 K is sensitively suppressed with a pressure as low as 0.48 GPa. However, superconductivity has not been induced with pressure up to 1.90 GPa.

Bi-stimuli assisted engineering and control of magnetic phase in monolayer CrOCl

2020 ◽  
Vol 22 (22) ◽  
pp. 12806-12813 ◽  
Author(s):  
A. K. Nair ◽  
S. Rani ◽  
M. Venkata Kamalakar ◽  
S. J. Ray
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
Electric Field ◽  
Magnetic Phase ◽  
Phase Control ◽  
Antiferromagnetic Phase ◽  
Two Dimensional ◽  
And Control

Magnetic phase control in two-dimensional CrOCl can be achieved through the application of strain and electric field. This leads to a ferromagnetic to antiferromagnetic phase transition and remarkable enhancement of the Curie temperature to 450 K.

Magnetic Phase Transition and Magnetic Proporties of LaFe11.6Si1.4Bx Compounds

2013 ◽  
Vol 750-752 ◽  
pp. 919-922
Author(s):  
Kun Xie ◽  
Yin Liu ◽  
Mei Qing Cao ◽  
Peng Cheng Xia ◽  
Li Jie Yue
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
Magnetic Phase Transition ◽  
Magnetic Entropy Change ◽  
Magnetic Phase ◽  
Magnetic Transition ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
First Order ◽  
Melt Spun

The magnetic phase transition and magnetic entropy change of melt-spun LaFe11.6Si1.4Bx(x=0.0, 0.3, 0.5, 0.7) ribbons were investigated by measuring the magnetization as the function of temperature. Comparing with LaFe11.6Si1.4, the NaZn13-type structure of LaFe11.6Si1.4Bxdid not change after introducing B atoms, while the amount of α-Fe phase in the ribbons significantly decreased. The Curie temperature slightly changes after the addition of B. The LaFe11.6Si1.4Bx(x=0.3, 0.5) exhibits first-order magnetic transition and large magnetic entropy change as observed in LaFe11.6Si1.4compound.

Bethe Approximation in the Theory of "Average Spin"

2014 ◽  
Vol 900 ◽  
pp. 260-263 ◽  
Author(s):  
Leonid L. Afremov ◽  
Aleksandr Petrov
Keyword(s):  
Phase Transition ◽  
Ising Model ◽  
Curie Temperature ◽  
Short Range ◽  
Short Range Order ◽  
Magnetic Phase ◽  
Magnetic Moments ◽  
Crystalline Lattice ◽  
Nearest Neighbours ◽  
Average Spin

The modeling study of magnetic phase transition with account of short-range order has been carried out in the approximation of random interaction between atomic magnetic moments of the nearest neighbours and in the frame of Ising model. Curie temperature has been calculated for different kinds of crystalline lattice.

Magnetic Compton Scattering Studies of the Invar Effect in Fe3Pt

1994 ◽  
Vol 375 ◽  
Author(s):  
C. J. Yahnke ◽  
G. Srajer ◽  
D. R. Haeffner ◽  
D. M. Mills ◽  
L. Assoufid
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
Compton Scattering ◽  
Magnetic Phase Transition ◽  
Room Temperature ◽  
Magnetic Phase ◽  
Substantial Reduction ◽  
Compton Profile ◽  
Invar Effect ◽  
The Moment

AbstractWe have measured the magnetic Compton profile (MCP) of ordered and disordered Fe 3Pt samples both above and below their Curie temperature. From these measurements, we have determined the average moment per atom at room temperature to be 2.81μB ± 0.04μB for disordered Fe3Pt and 1.78μB ± 0.05μB for ordered Fe3Pt. At temperatures above Tc, we measured a substantial reduction in the moment (0.6μB ± 0.10μB for disordered Fe3Pt and 0.64μB ± 0.13μB ± for ordered Fe3Pt) and a change in the shape of the MCP. This suggests that the mechanism behind the Invar effect in Fe3Pt can be described by a high-spin to low-spin magnetic phase transition. The experimental MCPs for both ordered and disordered Fe3 Pt are analyzed within the framework of the Weiss 2γ model.

Survival of mouse blastocysts after low-temperature preservation under high pressure

2004 ◽  
Vol 52 (4) ◽  
pp. 479-487 ◽  
Author(s):  
Cs. Pribenszky ◽  
M. Molnár ◽  
S. Cseh ◽  
L. Solti
Keyword(s):  
Phase Transition ◽  
Hydrostatic Pressure ◽  
Low Temperature ◽  
High Hydrostatic Pressure ◽  
Room Temperature ◽  
Freezing Point ◽  
Significant Loss ◽  
Embryo Cryopreservation ◽  
Subzero Temperatures ◽  
Survival Capacity

Cryoinjuries are almost inevitable during the freezing of embryos. The present study examines the possibility of using high hydrostatic pressure to reduce substantially the freezing point of the embryo-holding solution, in order to preserve embryos at subzero temperatures, thus avoiding all the disadvantages of freezing. The pressure of 210 MPa lowers the phase transition temperature of water to -21°C. According to the results of this study, embryos can survive in high hydrostatic pressure environment at room temperature; the time embryos spend under pressure without significant loss in their survival could be lengthened by gradual decompression. Pressurisation at 0°C significantly reduced the survival capacity of the embryos; gradual decompression had no beneficial effect on survival at that stage. Based on the findings, the use of the phenomena is not applicable in this form, since pressure and low temperature together proved to be lethal to the embryos in these experiments. The application of hydrostatic pressure in embryo cryopreservation requires more detailed research, although the experience gained in this study can be applied usefully in different circumstances.

Sign in / Sign up

Export Citation Format

Share Document