Short-range antiferromagnetic ordering with spiral structure in the finite-doping regime

1990 ◽  
Vol 42 (1) ◽  
pp. 803-809 ◽  
Author(s):  
Z. Y. Weng ◽  
C. S. Ting
Keyword(s):  
Short Range ◽  
Spiral Structure ◽  
Antiferromagnetic Ordering

scholarly journals Stochastic star formation and spiral structure

1985 ◽  
Vol 106 ◽  
pp. 551-558
Author(s):  
Philip E. Seiden
Keyword(s):  
Star Formation ◽  
Long Range ◽  
Molecular Cloud ◽  
Short Range ◽  
Spiral Structure ◽  
Open Cluster ◽  
Gravitational Interaction ◽  
Range Order ◽  
Ionization Front ◽  
Long Range Order

Most approaches to explaining the long-range order of the spiral arms in galaxies assume that it is induced by the long-range gravitational interaction. However, it is well-known in many fields of physics that long-range order may be induced by short-range interactions. A typical example is magnetism, where the exchange interaction between magnetic spins has a range of only 10 ångströms, yet a bar magnet can be made as large as one likes. Stochastic self-propagating star formation (SSPSF) starts from the point of view of a short-range interaction and examines the spiral structure arising from it (Seiden and Gerola 1982). We assume that the energetic processes of massive stars, stellar winds, ionization-front shocks and supernova shocks, in an OB association or open cluster can induce the creation of a new molecular cloud from cold interstellar atomic hydrogen. In turn this new molecular cloud will begin to form stars that will allow the process to repeat, creating a chain reaction. The differential rotation existing in a spiral galaxy will stretch the aggregation of recently created stars into spiral features.

COEXISTENCE OF SUPERCONDUCTIVITY AND ANTIFERROMAGNETISM

1991 ◽  
Vol 05 (04) ◽  
pp. 563-645 ◽  
Author(s):  
Y.A. IZYUMOV ◽  
V.M. LAPTEV
Keyword(s):  
Spiral Structure ◽  
Theoretical Work ◽  
Superconducting Transition ◽  
Coupling Theory ◽  
Unified Approach ◽  
Eliashberg Equations ◽  
Antiferromagnetic Ordering ◽  
Nonmagnetic Impurities ◽  
Separate Treatment ◽  
Entire Treatment

An overview of the theoretical work on the problem of the influence of the antiferromagnetic ordering of localized spins on the superconducting state is provided. Effects of the exchange interaction of electrons with localized spins, are investigated. Separate treatment is given to the electron-magnon part of this interaction. The electron-magnon contribution is shown to affect both the singlet and triplet pairings. For different antiferromagnets — a collinear antiferromagnetic structure and a simple spiral structure — we investigate in detail the effect of the electron spectrum exchange readjustment due to the magnetic structure and analyse the relation of this effect to superconductivity. The influence of nonmagnetic impurities on the superconducting transition temperature in antiferromagnets is also noted. The entire treatment is carried out in terms of a unified approach of strong-coupling theory, by invoking the use of Eliashberg equations.

EPR study of antiferromagnetic ordering in CrVO4

1969 ◽  
Vol 47 (17) ◽  
pp. 1865-1867 ◽  
Author(s):  
P. R. Elliston
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Line Width ◽  
Short Range ◽  
Short Range Order ◽  
Range Order ◽  
Intensity Data ◽  
Néel Temperature ◽  
Paramagnetic Resonance ◽  
Antiferromagnetic Ordering ◽  
Electron Paramagnetic

The intensity and line width of the electron paramagnetic resonance have been studied above the Néel temperature in polycrystalline CrVO4. The intensity data give TN = 51 ± 1 °K. Both the intensity and line-width data suggest considerable short-range order above TN.

Short-Range Antiferromagnetic Ordering of Netlike S = 1/2 Linear Trimeric Units in the Copper Germanate K2Cu3Ge4O12

2018 ◽  
Vol 57 (22) ◽  
pp. 14421-14426
Author(s):  
Christiane Stoll ◽  
Oliver Janka ◽  
Rainer Pöttgen ◽  
Markus Seibald ◽  
Dominik Baumann ◽  
...  
Keyword(s):  
Short Range ◽  
Antiferromagnetic Ordering ◽  
Copper Germanate

SHORT RANGE ANTIFERROMAGNETIC ORDERING IN FLUORIDE GLASSES "PbMnFeF7 AND "Pb2MnFeF9"

1982 ◽  
Vol 43 (C9) ◽  
pp. C9-677-C9-680
Author(s):  
A. Le Bail ◽  
C. Jacoboni ◽  
R. De Pape
Keyword(s):  
Short Range ◽  
Fluoride Glasses ◽  
Antiferromagnetic Ordering

Density waves in disk galaxies

1967 ◽  
Vol 31 ◽  
pp. 313-317 ◽  
Author(s):  
C. C. Lin ◽  
F. H. Shu
Keyword(s):  
Mathematical Analysis ◽  
Spiral Structure ◽  
Stellar System ◽  
Collective Modes ◽  
Disk Galaxies ◽  
Spiral Pattern ◽  
Density Waves ◽  
The Galaxy ◽  
Detailed Mathematical Analysis

Density waves in the nature of those proposed by B. Lindblad are described by detailed mathematical analysis of collective modes in a disk-like stellar system. The treatment is centered around a hypothesis of quasi-stationary spiral structure. We examine (a) the mechanism for the maintenance of this spiral pattern, and (b) its consequences on the observable features of the galaxy.

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