Magnetic dynamics in colossal magnetoresistive perovskite manganites

1998 ◽  
Vol 356 (1742) ◽  
pp. 1563-1575 ◽  
Author(s):  
T. G. Perring ◽  
G. Aeppli ◽  
S. M. Hayden ◽  
Y. Tokura ◽  
Y. Moritomo ◽  
...  
Keyword(s):  
Perovskite Manganites ◽  
Magnetic Dynamics ◽  
Colossal Magnetoresistive

scholarly journals Structural and Magnetic States in Layered Manganites: An Expanding View of the Phase Diagram

1999 ◽  
Vol 602 ◽  
Author(s):  
J.F. Mitchell ◽  
J.E. Millburn ◽  
C. Ling ◽  
D.N. Argyriou ◽  
H. N. Bordallo
Keyword(s):  
Degrees Of Freedom ◽  
Hole Concentration ◽  
Charge Ordering ◽  
Perovskite Manganites ◽  
Electronic Interactions ◽  
Colossal Magnetoresistive ◽  
Reduced Dimensions ◽  
Incommensurate Magnetic Structure ◽  
Extreme Sensitivity ◽  
Magnetic States

AbstractColossal magnetoresistive (CMR) manganites display a spectacular range of structural, magnetic, and electronic phases as a function of hole concentration, temperature, magnetic field, etc. Although the bulk of research has concentrated on the 3-D perovskite manganites, the ability to study anisotropic magnetic and electronic interactions made available in reduced dimensions has accelerated interest in the layered Ruddlesden-Popper (R-P) phases of the manganite class. The quest for understanding the coupling among lattice, spin, and electronic degrees of freedom (and dimensionality) is driven by the availability of high quality materials. In this talk, we will present recent results on synthesis and magnetic properties of layered manganites from the La2−2xSr1+2xMn2O7 series in the Mn4+-rich regime x > 0.5. This region of the composition diagram is populated by antiferromagnetic structures that evolve from the A-type layered order to G-type “rocksalt” order as x increases. Between these two regimes is a wide region (0.7 < x < 0.9) where an incommensurate magnetic structure is observed. The IC structure joins spin canting and phase separation as a mode for mixed-valent manganites to accommodate FM/AF competition. Transport in these materials is dominated by highly insulating behavior, although a region close to x = 0.5 exhibits metal-nonmetal transitions and an extreme sensitivity to oxygen content. We suggest two possible explanations for this transport behavior at doping just above x=0.5: localization by oxygen defects or charge ordering of Mn3+/Mn4+ sites.

Investigation of Nano-Sized Al2O3 on Pr-Sr-Mn-O Composites: Structural, Microstructural and Magnetic Properties

2020 ◽  
Vol 307 ◽  
pp. 3-8
Author(s):  
Kean Pah Lim ◽  
Lik Nguong Lau ◽  
Mohd Mustafa Awang Kechik ◽  
Soo Kien Chen ◽  
Shaari Abdul Halim ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Secondary Phase ◽  
Solid State Reaction Method ◽  
Perovskite Manganites ◽  
Structural Parameter ◽  
Effective Measure ◽  
Colossal Magnetoresistive ◽  
Sensor Applications ◽  
Atomic Force ◽  
Diffraction Patterns

Perovskite manganites have always been the research interest attributed to its intriguing colossal magnetoresistive (CMR) properties. Incorporation of an insulating secondary phase into the manganite composites has proven as an effective measure to enhance the low field magnetoresistance (LFMR). This paper reports the structural, microstructural and magnetic properties of (1-x) Pr0.7Sr0.3MnO3 (PSMO): x Al2O3 composites synthesized by the solid-state reaction method. Different compositions of nano-sized Al2O3 (x = 0.00, 0.05, 0.10, 0.15 and 0.20) were appended into the samples to investigate its effect on the physical properties. X-ray diffraction patterns show all samples exhibit polycrystalline PSMO as the major phase and strong orientation along (121) direction throughout the series. The crystal structural parameter is presented by Rietveld refinement. Nano-sized of Al2O3 has distorted the pure PSMO as changes have been observed in bond length and bond angle observed. Surface roughness and particle size show the increment along with increasing Al2O3 composition from the atomic force microscope (AFM) analysis. All samples possess the narrow hysteresis loop with weak ferromagnetic nature. The PSMO: Al2O3 presented in this study is a promising manganite composite which can be utilized in the magnetic sensor applications.

Chemical composition effects in the thin films of the colossal magnetoresistive perovskite manganates grown by MOCVD

1999 ◽  
Vol 09 (PR8) ◽  
pp. Pr8-659-Pr8-666 ◽  
Author(s):  
O. Yu. Gorbenko ◽  
I. E. Graboy ◽  
A. A. Bosak ◽  
V. A. Amelichev ◽  
A. Yu. Ganin ◽  
...  
Keyword(s):  
Thin Films ◽  
Chemical Composition ◽  
Colossal Magnetoresistive ◽  
Composition Effects

Regulating the magnetic dynamics of mononuclear β-diketone Dy(iii) single-molecule magnets through the substitution effect on capping N-donor coligands

2021 ◽  
Vol 50 (6) ◽  
pp. 2102-2111
Author(s):  
Jing Xi ◽  
Xiufang Ma ◽  
Peipei Cen ◽  
Yuewei Wu ◽  
Yi-Quan Zhang ◽  
...  
Keyword(s):  
Ab Initio ◽  
Single Molecule ◽  
Substitution Effect ◽  
Single Molecule Magnets ◽  
Magnetic Dynamics ◽  
Magnetic Investigation

Substituent change modulates the coordination symmetries and magnetic dynamics of five mononuclear β-diketonate-Dy(iii) complexes with capping N-donor coligands, which is studied by the combination of magnetic investigation and ab initio calculation.

scholarly journals Relationship between crystal structure and multiferroic orders in orthorhombic perovskite manganites

2018 ◽  
Vol 2 (10) ◽  
Author(s):  
Natalya S. Fedorova ◽  
Yoav William Windsor ◽  
Christoph Findler ◽  
Mahesh Ramakrishnan ◽  
Amadé Bortis ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Perovskite Manganites ◽  
Orthorhombic Perovskite

scholarly journals Magnetic dynamics with Weyl fermions

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Yaroslav Tserkovnyak
Keyword(s):  
Magnetic Dynamics ◽  
Weyl Fermions

scholarly journals Phase transition in perovskite manganites with orbital degree of freedom

2000 ◽  
Vol 61 (21) ◽  
pp. 14647-14655 ◽  
Author(s):  
S. Okamoto ◽  
S. Ishihara ◽  
S. Maekawa
Keyword(s):  
Phase Transition ◽  
Degree Of Freedom ◽  
Perovskite Manganites ◽  
Orbital Degree
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