A large enhancement of magnetocaloric effect by chemical ordering in manganites

2018 ◽  
Vol 6 (5) ◽  
pp. 1224-1228 ◽  
Author(s):  
Yanmei Wang ◽  
Yinyan Zhu ◽  
Hao Liu ◽  
Hanxuan Lin ◽  
Tian Miao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Magnetocaloric Effect ◽  
Length Scale ◽  
Electronic Phase Separation ◽  
Chemical Ordering ◽  
Electronic Phase ◽  
Large Enhancement

A dramatic enhancement of magnetocaloric effect by controlling the length scale of electronic phase separation in manganite films.

scholarly journals Chemical ordering suppresses large-scale electronic phase separation in doped manganites

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Yinyan Zhu ◽  
Kai Du ◽  
Jiebin Niu ◽  
Lingfang Lin ◽  
Wengang Wei ◽  
...  
Keyword(s):  
Phase Separation ◽  
Large Scale ◽  
Electronic Phase Separation ◽  
Chemical Ordering ◽  
Electronic Phase ◽  
Doped Manganites

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.

Exchange bias in a singleLaMnO3film induced by vertical electronic phase separation

2014 ◽  
Vol 89 (16) ◽  
Author(s):  
J. J. Peng ◽  
C. Song ◽  
B. Cui ◽  
F. Li ◽  
H. J. Mao ◽  
...  
Keyword(s):  
Phase Separation ◽  
Exchange Bias ◽  
Electronic Phase Separation ◽  
Electronic Phase

Direct evidence for charge ordering and electronic phase separation in BixSr1−xMnO3 at room temperature

2005 ◽  
Vol 370 (1-4) ◽  
pp. 172-177 ◽  
Author(s):  
A. Gupta ◽  
S.B. Samanta ◽  
V.P.S. Awana ◽  
H. Kishan ◽  
A.M. Awasthi ◽  
...  
Keyword(s):  
Phase Separation ◽  
Room Temperature ◽  
Direct Evidence ◽  
Charge Ordering ◽  
Electronic Phase Separation ◽  
Electronic Phase

Possible origin of electronic phase separation in La0.7Ca0.3MnO3

2008 ◽  
Vol 104 (6) ◽  
pp. 063717 ◽  
Author(s):  
P. R. Sagdeo ◽  
R. J. Choudhary ◽  
D. M. Phase
Keyword(s):  
Phase Separation ◽  
Electronic Phase Separation ◽  
Electronic Phase

scholarly journals Electronic Phase Separation in the Slightly Underdoped Iron Pnictide SuperconductorBa1−xKxFe2As2

2009 ◽  
Vol 102 (11) ◽  
Author(s):  
J. T. Park ◽  
D. S. Inosov ◽  
Ch. Niedermayer ◽  
G. L. Sun ◽  
D. Haug ◽  
...  
Keyword(s):  
Phase Separation ◽  
Iron Pnictide ◽  
Electronic Phase Separation ◽  
Electronic Phase
Sign in / Sign up

Export Citation Format

Share Document