scholarly journals Anomalous behavior above the Curie temperature in (Nd1−xGdx)0.55Sr0.45MnO3 (x = 0, 0.1, 0.3 and 0.5)

RSC Advances ◽  
2019 ◽  
Vol 9 (47) ◽  
pp. 27541-27548 ◽  
Author(s):  
R. Kamel ◽  
A. Tozri ◽  
E. Dhahri ◽  
E. K. Hlil
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Anomalous Behavior

Magnetic properties were studied just above the ferromagnetic–paramagnetic (FM–PM) phase transition of (Nd1−xGdx)0.55Sr0.45MnO3 with x = 0, 0.1, 0.3 and 0.5.

Cation distribution dependent magnetic properties in CoCr2−xFexO4 (x = 0.1 to 0.5): EXAFS, Mössbauer and magnetic measurements

2017 ◽  
Vol 46 (31) ◽  
pp. 10300-10314 ◽  
Author(s):  
D. Kumar ◽  
A. Banerjee ◽  
A. Mahmoud ◽  
Chandana Rath
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Cation Distribution ◽  
Magnetic Measurements ◽  
Magnetic Transitions ◽  
Ferrimagnetic Phase ◽  
Evolution Of Structure ◽  
Lock In

Evolution of structure and rich magnetic transitions such as paramagnetic to ferrimagnetic phase transition at Curie temperature (TC), spiral ordering temperature (TS) and lock-in temperature (TL) have been discussed in CoCr2O4 spinel multiferroic after substituting Fe.

scholarly journals Effects of temperature and concentration of La in the form of A1 transverse optical phonon in the PbTiO3 system

Cerâmica ◽  
2012 ◽  
Vol 58 (347) ◽  
pp. 313-316 ◽  
Author(s):  
M. R. Joya ◽  
J. J. Barba-O ◽  
P. S. Pizani
Keyword(s):  
Phase Transition ◽  
Curie Temperature ◽  
High Temperatures ◽  
Wide Temperature Range ◽  
Lead Titanate ◽  
Vibrational Mode ◽  
Structural Phase ◽  
Anomalous Behavior ◽  
Effects Of Temperature ◽  
Curie Temperature Tc

The structural phase transition from ferroelectric to paraelectric was studied by Raman scattering in the ceramic lead titanate (PbTiO3) doped with lanthanum (La). A1 vibrational mode contains some sub-peaks that have been associated in literature with PbTiO3 concentration (Ca, Ba), and effects of high temperatures as it approaches the Curie temperature (Tc). Raman new study shows that the anomalous behavior of the A1 mode is not only caused by the effects of concentration or temperature near Tc, but by anharmonicity and defects in the network in the PbTiO3 thermodynamically are inevitable. This effect was studied by a wide temperature range from 10 K to Tc in each sample (La = 0, 5, 10, 15, 20%), showing that the effect depends not only on the high temperatures in the pure PT.

Electrolytic Hydriding of La(Fe, Si)13 Based Materials and its Magnetocaloric Effect

2014 ◽  
Vol 809-810 ◽  
pp. 443-448 ◽  
Author(s):  
Kun Yang ◽  
Na Tian ◽  
Cai Yin You
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
External Field ◽  
Curie Temperature ◽  
Surface Morphology ◽  
Order Phase Transition ◽  
Magnetic Entropy Change ◽  
Entropy Change ◽  
Magnetic Entropy ◽  
Second Order Phase Transition

In this paper, the hydriding of La (Fe, Fe)13 based alloys was realized by the electrolytic method and the effect of electrolytic temperature on the hydriding was investigated. The phase components and surface morphology were analyzed by XRD and SEM. The magnetic properties of samples were characterized using VSM. Results showed that the electrolytic hydriding process was enhanced by increasing the electrolytic temperature. The Curie temperature was increased from 196 K to 325 K. Through Arrot-plot analyses, it was found that the phase transition of samples tends to be a second order phase transition. The magnetic entropy change was reduced from 8.03 J/(kg•K) to 2.03 J/(kg•K) under a maximum external field of 1.5 T.

scholarly journals Electronic and magnetic properties of monolayer α-RuCl3: a first-principles and Monte Carlo study

2018 ◽  
Vol 20 (2) ◽  
pp. 997-1004 ◽  
Author(s):  
S. Sarikurt ◽  
Y. Kadioglu ◽  
F. Ersan ◽  
E. Vatansever ◽  
O. Üzengi Aktürk ◽  
...  
Keyword(s):  
Phase Transition ◽  
Monte Carlo ◽  
Magnetic Properties ◽  
Curie Temperature ◽  
Specific Heat ◽  
First Principles ◽  
Monte Carlo Study ◽  
Electronic And Magnetic Properties ◽  
Chemical Exfoliation

Recent experiments revealed that monolayer α-RuCl3 can be obtained by a chemical exfoliation method and exfoliation or restacking of nanosheets can manipulate the magnetic properties of the materials. Thermal variations of magnetization and specific heat curves indicate that monolayer α-RuCl3 exhibits a phase transition between ordered and disordered phases at the Curie temperature of 14.21 K.

Suppression of Ferromagnetism in EuxCa1-xB6

2012 ◽  
Vol 190 ◽  
pp. 97-100 ◽  
Author(s):  
V.V. Glushkov ◽  
A.V. Kuznetsov ◽  
I. Sannikov ◽  
A.V. Bogach ◽  
S.V. Demishev ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Curie Temperature ◽  
Single Crystals ◽  
Effective Magnetic Moment ◽  
Paramagnetic State ◽  
Low Field ◽  
Wide Range ◽  
Free Ion ◽  
The Eu

We report the magnetic properties of EuxCa1-xB6 single crystals (0.756x1) studied in the wide range of temperatures (1.8-300 K) and magnetic fields (up to 50 kOe). It was found that low field magnetic susceptibility χ (T) follows the Curie-Weiss law χ~(T-Θp)-1 at high temperatures for all the concentrations studied. The effective magnetic moment of the Eu2+ ion estimated from the data diminishes from the free ion value μeff7.93μB (μB - Bohr magneton) for x=1 to μeff7.3μB for x=0.756. A universal behavior of magnetic susceptibility χ~(T-Θ)-α (α=1.5) is detected close to the Curie temperature TC in the paramagnetic state at both metallic (x>xC~0.8) and dielectric (xC.

scholarly journals Cooper Pair-Like Systems at High Temperature and their Role on Fluctuations Near the Critical Temperature

1998 ◽  
Vol 12 (29n31) ◽  
pp. 3216-3219 ◽  
Author(s):  
M. Ausloos ◽  
S. Dorbolo
Keyword(s):  
Phase Transition ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Critical Temperature ◽  
Oxygen Diffusion ◽  
Cooper Pair ◽  
Anomalous Behavior ◽  
Anomalous Effect ◽  
Linear Temperature ◽  
Ybco Sample

A logarithmic behavior is hidden in the linear temperature regime of the electrical resistivity R(T) of some YBCO sample below 2T c where "pairs" break apart, fluctuations occur and "a gap is opening". An anomalous effect also occurs near 200 K in the normal state Hall coefficient. In a simulation of oxygen diffusion in planar 123 YBCO, an anomalous behavior is found in the oxygen-vacancy motion near such a temperature. We claim that the behavior of the specific heat above and near the critical temperature should be reexamined in order to show the influence and implications of fluctuations and dimensionality on the nature of the phase transition and on the true onset temperature.

Sign in / Sign up

Export Citation Format

Share Document