Correction of the expression for the form of the nuclear-induction signal in linear magnetic systems

1984 ◽  
Vol 27 (7) ◽  
pp. 583-586
Author(s):  
V. P. Grigor'ev
Keyword(s):  
Magnetic Systems ◽  
Induction Signal ◽  
Nuclear Induction

The lineshape of the nuclear induction signal in disordered conductors

1992 ◽  
Vol 83 (4) ◽  
pp. 307-309
Author(s):  
I.A. Azarov ◽  
B.P. Vodop'yanov
Keyword(s):  
Induction Signal ◽  
Nuclear Induction

A double pulse method of N.Q.R. detection

1973 ◽  
Vol 26 (4) ◽  
pp. 859 ◽  
Author(s):  
KR Doolan ◽  
S Hacobian
Keyword(s):  
Relaxation Time ◽  
Spin Relaxation ◽  
Noise Level ◽  
Pulse Method ◽  
Spin Relaxation Time ◽  
Double Pulse ◽  
Induction Signal ◽  
Nuclear Induction ◽  
Nuclear Signal

A method of n.q.r. detection is described in which pairs of radiofrequency pulses from a super-regenerative oscillator excite and detect resonance. For large enough intervals of time between successive pairs of pulses, the nuclear signal produced by any pair decays well below noise level at the arrival of the next pair, so that the first pulse of each pair does not detect n.q.r. The second pulse is then moved along the nuclear induction signal, produced by the first pulse of each pair, to record its variation as a function of time. A method is given for the evaluation of the apparent spin-spin relaxation time from measurements taken using a sample of p-dichlorobenzene at 23°C.

Hedgehog structure in nematic and magnetic systems

1988 ◽  
Vol 49 (7) ◽  
pp. 1097-1101 ◽  
Author(s):  
N. Schopohl ◽  
T.J. Sluckin
Keyword(s):  
Magnetic Systems

Dynamical chaos in magnetic systems

1992 ◽  
Vol 162 (7) ◽  
pp. 81 ◽  
Author(s):  
K.N. Alekseev ◽  
G.P. Berman ◽  
V.I. Tsifrinovich ◽  
A.M. Frishman
Keyword(s):  
Dynamical Chaos ◽  
Magnetic Systems

The localized electron: magnetic properties

2018 ◽  
Author(s):  
Jean-Pierre Launay ◽  
Michel Verdaguer
Keyword(s):  
Single Molecule ◽  
Model Systems ◽  
Ferromagnetic Coupling ◽  
Single Chain ◽  
Single Molecule Magnets ◽  
Magnetic Systems ◽  
Orbital Interactions ◽  
Prussian Blue Analogues ◽  
Mononuclear Complexes

After preliminaries about electron properties, and definitions in magnetism, one treats the magnetism of mononuclear complexes, in particular spin cross-over, showing the role of cooperativity and the sensitivity to external perturbations. Orbital interactions and exchange interaction are explained in binuclear model systems, using orbital overlap and orthogonality concepts to explain antiferromagnetic or ferromagnetic coupling. The phenomenologically useful Spin Hamiltonian is defined. The concepts are then applied to extended molecular magnetic systems, leading to molecular magnetic materials of various dimensionalities exhibiting bulk ferro- or ferrimagnetism. An illustration is provided by Prussian Blue analogues. Magnetic anisotropy is introduced. It is shown that in some cases, a slow relaxation of magnetization arises and gives rise to appealing single-ion magnets, single-molecule magnets or single-chain magnets, a route to store information at the molecular level.

Description and symmetry of aperiodic crystals

2018 ◽  
Author(s):  
Ted Janssen ◽  
Gervais Chapuis ◽  
Marc de Boissieu
Keyword(s):  
Time Reversal ◽  
Mathematical Concept ◽  
New Materials ◽  
Magnetic Systems ◽  
Atomic Structures ◽  
Modulated Phases ◽  
Quasiperiodic Functions ◽  
Aperiodic Crystals ◽  
Superspace Description

This chapter first introduces the mathematical concept of aperiodic and quasiperiodic functions, which will form the theoretical basis of the superspace description of the new recently discovered forms of matter. They are divided in three groups, namely modulated phases, composites, and quasicrystals. It is shown how the atomic structures and their symmetry can be characterized and described by the new concept. The classification of superspace groups is introduced along with some examples. For quasicrystals, the notion of approximants is also introduced for a better understanding of their structures. Finally, alternatives for the descriptions of the new materials are presented along with scaling symmetries. Magnetic systems and time-reversal symmetry are also introduced.

Elastic behavior of magnetic systems with a narrow twofold-degenerate band

1987 ◽  
Vol 36 (7) ◽  
pp. 3868-3873 ◽  
Author(s):  
D. K. Ray ◽  
S. K. Ghatak
Keyword(s):  
Elastic Behavior ◽  
Magnetic Systems
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