‘Griffiths phase’ versus chemical disorder in low-doped manganites: La0.9Sr0.1MnO3 crystal revisited

2011 ◽  
Vol 109 (7) ◽  
pp. 07D902 ◽  
Author(s):  
E. Rozenberg ◽  
M. Auslender ◽  
A.I. Shames ◽  
I. Felner ◽  
D. Mogilyansky ◽  
...  
Keyword(s):  
Griffiths Phase ◽  
Phase Versus ◽  
Chemical Disorder ◽  
Doped Manganites

Evidence of the Griffiths Phase in Doped Manganites Studied by Electron Paramagnetic Resonance Measurements

2004 ◽  
Vol 21 (11) ◽  
pp. 2285-2288 ◽  
Author(s):  
Yuan Song-Liu ◽  
Liu Sheng ◽  
Cao Heng ◽  
Shang Jing-Lin ◽  
Dong Bo ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Griffiths Phase ◽  
Paramagnetic Resonance ◽  
Doped Manganites ◽  
Electron Paramagnetic

A-site-disorder-dependent percolative transport and Griffiths phase in doped manganites

2004 ◽  
Vol 70 (22) ◽  
Author(s):  
N. Rama ◽  
M. S. Ramachandra Rao ◽  
V. Sankaranarayanan ◽  
P. Majewski ◽  
S. Gepraegs ◽  
...  
Keyword(s):  
Griffiths Phase ◽  
Site Disorder ◽  
Doped Manganites ◽  
A Site

Chemical disorder induced positive magnetoimpedance in La0.7Pb0.3Mn0.35Fe0.65O3- and La0.7Pb0.3Mn0.3Fe0.7O3- manganites

2021 ◽  
Author(s):  
Priyanka Singh ◽  
Brajendra Singh ◽  
Mukul Gupta
Keyword(s):  
Magnetic Field ◽  
Magnetic Field Measurement ◽  
Fe Doping ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Magnetic Region ◽  
X Ray ◽  
Chemically Modified ◽  
Chemical Disorder ◽  
Doped Manganites

We report structural, magnetic and magnetoimpedance properties of La0.7Pb0.3Mn0.35Fe0.65O3- and La0.7Pb0.3Mn0.3Fe0.7O3- manganites. Bulk samples were prepared by solid state method. Rietveld refinement of the X-ray diffraction pattern shows the crystallization of these samples in trigonal crystal system. Fe doping at Mn site in La0.7Pb0.3MnO3 increases the lattice parameters and induces oxygen non stoichiometry in the lattice of La0.7Pb0.3Mn0.35Fe0.65O3-and La0.7Pb0.3Mn0.3Fe0.7O3-. La0.7Pb0.3Mn0.3Fe0.7O3-composition shows ~180% positive magnetoimpedance at 1Tesla magnetic field while La0.7Pb0.3Mn0.35Fe0.65O3- shows ~75% positive magnetoimpedance at 320K. Magnetization versus applied magnetic field measurement curves show the magnetic moment of La0.7Pb0.3Mn0.35Fe0.65O3-and La0.7Pb0.3Mn0.3Fe0.7O3-do not saturate up to 2 tesla magnetic field at 300K. Fe doping at Mn site in these manganites created chemically modified systems where the origin of positive magnetoimpedance is found due to the presence of magnetic region inside of the nonmagnetic regions. Huge positive magnetoimpedance in 65% and 70% Fe doped manganites originated by maxwell wagner effect due to the chemical disorder induced by Fe in manganite lattice.

THE DYNAMICS OF DISORDERED MAGNETS IN THE GRIFFITHS PHASE, INVESTIGATED BY NEUTRON SCATTERING

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1047-C8-1048
Author(s):  
R. G. Lloyd ◽  
P. W. Mitchell ◽  
R. C. C. Ward ◽  
M. Cherrill
Keyword(s):  
Neutron Scattering ◽  
Griffiths Phase ◽  
Disordered Magnets

The temperature dependence of the low field magnetoresistance in electron-doped manganites: La1 xTexMnO3(x= 0.04,0.1)

2004 ◽  
Vol 16 (8) ◽  
pp. 1447-1453 ◽  
Author(s):  
Guotai Tan ◽  
Ping Duan ◽  
Guang Yang ◽  
Shouyu Dai ◽  
Bolin Cheng ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Low Field ◽  
Doped Manganites

scholarly journals Anion ordering enables fast H− conduction at low temperatures

2021 ◽  
Vol 7 (23) ◽  
pp. eabf7883
Author(s):  
Hiroki Ubukata ◽  
Fumitaka Takeiri ◽  
Kazuki Shitara ◽  
Cédric Tassel ◽  
Takashi Saito ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Room Temperature ◽  
Structural Transition ◽  
Hexagonal Lattice ◽  
Ionic Conductors ◽  
Activation Barriers ◽  
Energy Devices ◽  
Energy Applications ◽  
Chemical Disorder ◽  
New Energy

The introduction of chemical disorder by substitutional chemistry into ionic conductors is the most commonly used strategy to stabilize high-symmetric phases while maintaining ionic conductivity at lower temperatures. In recent years, hydride materials have received much attention owing to their potential for new energy applications, but there remains room for development in ionic conductivity below 300°C. Here, we show that layered anion-ordered Ba2−δH3−2δX (X = Cl, Br, and I) exhibit a remarkable conductivity, reaching 1 mS cm−1 at 200°C, with low activation barriers allowing H− conduction even at room temperature. In contrast to structurally related BaH2 (i.e., Ba2H4), the layered anion order in Ba2−δH3−2δX, along with Schottky defects, likely suppresses a structural transition, rather than the traditional chemical disorder, while retaining a highly symmetric hexagonal lattice. This discovery could open a new direction in electrochemical use of hydrogen in synthetic processes and energy devices.

scholarly journals Epidemic growth and Griffiths effects on an emergent network of excited atoms

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
T. M. Wintermantel ◽  
M. Buchhold ◽  
S. Shevate ◽  
M. Morgado ◽  
Y. Wang ◽  
...  
Keyword(s):  
Complex Systems ◽  
Power Laws ◽  
Excitation Density ◽  
Griffiths Phase ◽  
Many Body ◽  
Excited Atoms ◽  
Equilibrium Dynamics ◽  
Many Body Systems ◽  
Excitation Number ◽  
Non Equilibrium

AbstractWhether it be physical, biological or social processes, complex systems exhibit dynamics that are exceedingly difficult to understand or predict from underlying principles. Here we report a striking correspondence between the excitation dynamics of a laser driven gas of Rydberg atoms and the spreading of diseases, which in turn opens up a controllable platform for studying non-equilibrium dynamics on complex networks. The competition between facilitated excitation and spontaneous decay results in sub-exponential growth of the excitation number, which is empirically observed in real epidemics. Based on this we develop a quantitative microscopic susceptible-infected-susceptible model which links the growth and final excitation density to the dynamics of an emergent heterogeneous network and rare active region effects associated to an extended Griffiths phase. This provides physical insights into the nature of non-equilibrium criticality in driven many-body systems and the mechanisms leading to non-universal power-laws in the dynamics of complex systems.

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