scholarly journals Electronic phase separation and magnetic-field-induced phenomena in molecular multiferroic (ND4)2FeCl5·D2O

2018 ◽  
Vol 98 (5) ◽  
Author(s):  
W. Tian ◽  
H. B. Cao ◽  
Amanda J. Clune ◽  
Kendall D. Hughey ◽  
Tao Hong ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Separation ◽  
Electronic Phase Separation ◽  
Electronic Phase

scholarly journals Optical Control of Superlattices States Formed Due to Electronic Phase Separation in Multiferroic Eu0.8Ce0.2Mn2O5

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1664
Author(s):  
Viktoriya Sanina ◽  
Boris Khannanov ◽  
Evgenii Golovenchits
Keyword(s):  
Magnetic Field ◽  
Phase Separation ◽  
Optical Pumping ◽  
Semiconductor Heterostructures ◽  
Optical Control ◽  
Self Organization ◽  
Electronic Phase Separation ◽  
Electronic Phase ◽  
Multiferroic Heterostructures ◽  
Crystal Volume

The effect of optical pumping and magnetic field on properties of the electronic phase separation regions, which are the multiferroic semiconductor heterostructures in the form of superlattices, have been studied in Eu0.8Ce0.2Mn2O5. These superlattices are formed due to self-organization in a dielectric crystal matrix as a result of the competing internal interactions balance and occupy a small crystal volume. The dynamical equilibrium states of superlattices are initially formed during cycling of as-grown samples in a magnetic field. The superlattices in such states are ferromagnetic and electrically neutral. Sets of ferromagnetic resonances were observed from individual layers of superlattices. Their features give rise information on properties of these layers and of a superlattice as a whole. The differences in the parameters of these resonances were due to different distributions of Mn3+ and Mn4+ ions in individual superlattices layers. It has been found that optical pumping having different powers allows us to control of multiferroic properties of superlattices layers by changing their magnetic and electric properties. It is shown that, under certain conditions, it is possible to significantly increase the temperatures at which multiferroic heterostructures exist.

scholarly journals Two-component electronic phase separation in the doped Mott insulator Y1−xCaxTiO3

2021 ◽  
Vol 104 (4) ◽  
Author(s):  
S. Hameed ◽  
J. Joe ◽  
D. M. Gautreau ◽  
J. W. Freeland ◽  
T. Birol ◽  
...  
Keyword(s):  
Phase Separation ◽  
Mott Insulator ◽  
Electronic Phase Separation ◽  
Electronic Phase ◽  
Two Component ◽  
Doped Mott Insulator

scholarly journals Low-temperature dielectric anomaly arising from electronic phase separation at the Mott insulator-metal transition

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
A. Pustogow ◽  
R. Rösslhuber ◽  
Y. Tan ◽  
E. Uykur ◽  
A. Böhme ◽  
...  
Keyword(s):  
Phase Separation ◽  
Mean Field Theory ◽  
Mean Field ◽  
Coulomb Repulsion ◽  
Mott Insulator ◽  
Electronic Phase Separation ◽  
First Order Phase Transition ◽  
Electronic Phase ◽  
Insulator Metal Transition ◽  
First Order Phase

AbstractCoulomb repulsion among conduction electrons in solids hinders their motion and leads to a rise in resistivity. A regime of electronic phase separation is expected at the first-order phase transition between a correlated metal and a paramagnetic Mott insulator, but remains unexplored experimentally as well as theoretically nearby T = 0. We approach this issue by assessing the complex permittivity via dielectric spectroscopy, which provides vivid mapping of the Mott transition and deep insight into its microscopic nature. Our experiments utilizing both physical pressure and chemical substitution consistently reveal a strong enhancement of the quasi-static dielectric constant ε1 when correlations are tuned through the critical value. All experimental trends are captured by dynamical mean-field theory of the single-band Hubbard model supplemented by percolation theory. Our findings suggest a similar ’dielectric catastrophe’ in many other correlated materials and explain previous observations that were assigned to multiferroicity or ferroelectricity.

Evidence of electronic phase separation in Er3+-doped La0.8Sr0.2MnO3

2003 ◽  
Vol 82 (17) ◽  
pp. 2865-2867 ◽  
Author(s):  
V. Ravindranath ◽  
M. S. Ramachandra Rao ◽  
R. Suryanarayanan ◽  
G. Rangarajan
Keyword(s):  
Phase Separation ◽  
Electronic Phase Separation ◽  
Electronic Phase

Electron Incoherent Scattering from Nanometer-Sized Charge Ordering in Colossal Magnetoresistive La2/3ca1/3mnO3

2001 ◽  
Vol 7 (S2) ◽  
pp. 434-435
Author(s):  
J. M. Zuo
Keyword(s):  
Phase Separation ◽  
Electron Diffraction ◽  
Degrees Of Freedom ◽  
Complex Oxides ◽  
Charge Ordering ◽  
Phase Separations ◽  
Length Scales ◽  
Colossal Magnetoresistive ◽  
Electronic Phase Separation ◽  
Electronic Phase

Electronic phase separation is known to occur in complex oxides ranging from high-Tc superconductors to colossal magnetoresisitive (CMR) manganites. Accumulating experimental evidences show regions of temperature dependent conducting and insulating regions, whose exact origin is unknown. Theoretically, it is has been shown that these systems are unstable from the strong interplay between the lattice, charge and spin degrees of freedom.The key to understand the electronic phase separation in complex oxides is the structure. Electron diffraction is the only probe that covers the length scales from angstroms to microns. Characterization at these length scales is critical (electronic phase separations are typically about nanometers in sizes). Traditionally, electron diffraction has been played important roles in discovering the new types of phase separations, but has contributed little to the quantitative understanding. The reason is the strong interaction of electrons with matter, which gives both strong inelastic background and multiple scattering.

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