Ferromagnetic Phase Transitions in Random Fields: The Breakdown of Scaling Laws

1976 ◽  
Vol 37 (14) ◽  
pp. 944-947 ◽  
Author(s):  
G. Grinstein
Keyword(s):  
Phase Transitions ◽  
Random Fields ◽  
Scaling Laws ◽  
Ferromagnetic Phase

scholarly journals Imaging the formation and surface phase separation of the CE phase

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Haibiao Zhou ◽  
Qiyuan Feng ◽  
Yubin Hou ◽  
Masao Nakamura ◽  
Yoshinori Tokura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transitions ◽  
Charge Ordering ◽  
Zero Magnetic Field ◽  
Ferromagnetic Phase ◽  
Emergent Properties ◽  
Orbital Ordering ◽  
Strong Electron ◽  
Antiferromagnetic Correlation ◽  
Ordering Transitions

AbstractThe CE phase is an extraordinary phase exhibiting the simultaneous spin, charge, and orbital ordering due to strong electron correlation. It is an ideal platform to investigate the role of the multiple orderings in the phase transitions and discover emergent properties. Here, we use a cryogenic high-field magnetic force microscope to image the phase transitions and properties of the CE phase in a Pr0.5Ca0.5MnO3 thin film. In a high magnetic field, we observed a clear suppression of magnetic susceptibility at the charge-ordering insulator transition temperature (TCOI), whereas, at the Néel temperature (TN), no significant change is observed. This observation favors the scenario of strong antiferromagnetic correlation developed below TCOI but raises questions about the Zener polaron paramagnetic phase picture. Besides, we discoverd a phase-separated surface state in the CE phase regime. Ferromagnetic phase domains residing at the surface already exist in zero magnetic field and show ultra-high magnetic anisotropy. Our results provide microscopic insights into the unconventional spin- and charge-ordering transitions and revealed essential attributes of the CE phase, highlighting unusual behaviors when multiple electronic orderings are involved.

Concentration Phase Transitions in Two-Sublattice Magnets

2012 ◽  
Vol 557-559 ◽  
pp. 731-734 ◽  
Author(s):  
Valery I. Belokon ◽  
Konstantin V. Nefedev ◽  
Olga I. Dyachenko
Keyword(s):  
Phase Transitions ◽  
Exchange Interaction ◽  
Critical Phenomena ◽  
Random Fields ◽  
Magnetic Phase ◽  
Critical Concentration ◽  
Magnetic Phase Transitions ◽  
System Of Equations ◽  
Sublattice Model ◽  
Interaction Method

Phase transitions and critical phenomena are investigated within a two-sublattice model. In the framework of the random fields with the exchange interaction method the system of equations is obtained. It allows us to establish conditions under which magnetic phase transitions are possible. Critical concentration of ferromagnetic atoms which is necessary for the existence of ferromagnetic, ferrimagnetic and antiferromagnetic phases is determined.

Mössbauer study of ferromagnetic phase transitions in(Pd1−xAgx)0.99Fe0.01alloys

1974 ◽  
Vol 9 (3) ◽  
pp. 1085-1091 ◽  
Author(s):  
R. A. Levy ◽  
J. J. Burton ◽  
D. I. Paul ◽  
J. I. Budnick
Keyword(s):  
Phase Transitions ◽  
Ferromagnetic Phase ◽  
Mössbauer Study

Improper ferromagnetic phase transitions in crystals

2005 ◽  
Vol 50 (5) ◽  
pp. 814-816
Author(s):  
S. V. Grigor’ev ◽  
B. M. Darinskii
Keyword(s):  
Phase Transitions ◽  
Ferromagnetic Phase

Phase transitions in diluted magnets: Critical behavior, percolation, and random fields

1984 ◽  
Vol 34 (5-6) ◽  
pp. 817-848 ◽  
Author(s):  
R. J. Birgeneau ◽  
R. A. Cowley ◽  
G. Shirane ◽  
H. Yoshizawa
Keyword(s):  
Phase Transitions ◽  
Critical Behavior ◽  
Random Fields
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