THE EFFECT OF MAGNETIC AND NON-MAGNETIC DILUTION ON THE MAGNETIC ORDERING IN THE HEXAGONAL ANTIFERROMAGNET CsMnBr3

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1255-C8-1256
Author(s):  
D. Visser ◽  
A. Harrison ◽  
G. J. McIntyre
Keyword(s):  
Magnetic Ordering ◽  
Magnetic Dilution

Effect of magnetic dilution on magnetic ordering in NipMg1−pO

1991 ◽  
Vol 70 (10) ◽  
pp. 6161-6163 ◽  
Author(s):  
Z. Feng ◽  
V. Suresh Babu ◽  
J. Zhao ◽  
Mohindar S. Seehra
Keyword(s):  
Magnetic Ordering ◽  
Magnetic Dilution

Magnetic properties and site occupancy of iron in nontronite

Clay Minerals ◽  
1990 ◽  
Vol 25 (1) ◽  
pp. 3-13 ◽  
Author(s):  
P. R. Lear ◽  
J. W. Stucki
Keyword(s):  
Site Occupancy ◽  
Magnetic Ordering ◽  
Exchange Interactions ◽  
Oxidation States ◽  
Isomorphous Substitution ◽  
Computer Simulation Model ◽  
Antiferromagnetic Exchange ◽  
Magnetic Exchange Interaction ◽  
Magnetic Exchange ◽  
Magnetic Dilution

AbstractThe magnetic susceptibilities of seven different nontronites in their natural oxidation states were measured between 5 and 100 K. Results revealed that the magnetic exchange interaction in all samples was antiferromagnetic, except no clear minimum occurred at the Néel temperature. Possible explanations for this phenomenon which are discussed include magnetic dilution due to isomorphous substitution, and antiferromagnetic frustration due to either non-centrosymmetric distribution of octahedral Fe3+ or tetrahedral Fe3+ substitution. A computer simulation model was developed to demonstrate the effects of these variables on long-range magnetic ordering. Magnetic dilution and tetrahedral Fe3+ content could explain the anomalous antiferromagnetic behaviour in some, but not all, samples. The non-centrosymmetric model is the only one which explains the behaviour of all samples. In this model, at least 13% of the octahedral Fe3+ would occupy trans-dihydroxide sites, with the balance in cis sites. Magnetic frustration occurs because two Fe3+ neighbours of a third Fe3+ ion are also neighbours to each other, making the simultaneous satisfaction of all antiferromagnetic exchange interactions impossible.

Magnetic ordering in Garfield nontronite under applied magnetic fields

Clay Minerals ◽  
1990 ◽  
Vol 25 (3) ◽  
pp. 261-269 ◽  
Author(s):  
E. Murad ◽  
J. D. Cashion ◽  
L. J. Brown
Keyword(s):  
Magnetic Fields ◽  
Magnetic Order ◽  
Magnetic Ordering ◽  
Bulk Sample ◽  
Antiferromagnetic Order ◽  
Hyperfine Fields ◽  
Magnetic Dilution ◽  
Applied Fields ◽  
Magnetic Hyperfine Splitting

AbstractMössbauer spectra of Garfield nontronite H33a were taken at temperatures between 2·5 and 37 K under longitudinally applied magnetic fields up to 9 T. While no magnetic order was apparent in the absence of an applied field above 7 K, the application of external magnetic fields led to the induction of magnetic hyperfine splitting up to at least 19 K. Variation of the applied fields allowed determination of hyperfine fields of bulk nontronite, and indicated the bulk sample to have a Néel temperature of about 20 K. The non-ideal behaviour of this nontronite, leading to the lack of magnetic order in the absence of applied magnetic fields, is in line with the frustration of antiferromagnetic order in the octahedral sheets due to the presence of about 6% of the iron content in tetrahedral sites, although some influence of magnetic dilution cannot be excluded.

NUCLEAR MAGNETIC ORDERING

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1436-C6-1443 ◽  
Author(s):  
A. Abragam ◽  
V. Bouffard ◽  
M. Goldman ◽  
Y. Roinel
Keyword(s):  
Magnetic Ordering ◽  
Nuclear Magnetic

THEORY OF THE NUCLEAR MAGNETIC ORDERING IN Cu IN A FIELD

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-2051-C8-2052 ◽  
Author(s):  
Per-Anker Lindgård
Keyword(s):  
Magnetic Ordering ◽  
Nuclear Magnetic

MAGNETIC ORDERING IN DILUTE YTb AND YEr ALLOYS

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-355-C8-356
Author(s):  
B. D. Rainford ◽  
S. H. Kilcoyne ◽  
K. A. Mohammed ◽  
P. C. Lanchester ◽  
H. B. Stanley ◽  
...  
Keyword(s):  
Magnetic Ordering

NEUTRON DIFFRACTION STUDY OF THE MAGNETIC ORDERING IN GdBa2Cu3O7-δ

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-2171-C8-2172
Author(s):  
T. Chattopadhyay ◽  
H. Maletta ◽  
W. Wirges ◽  
K. Fischer ◽  
P. J. Brown
Keyword(s):  
Neutron Diffraction ◽  
Diffraction Study ◽  
Magnetic Ordering ◽  
Neutron Diffraction Study

Dipole magnetic ordering in nuclear spin-spin systems

1975 ◽  
Vol 116 (7) ◽  
pp. 485 ◽  
Author(s):  
V.G. Pokazan'ev ◽  
G.V. Skrotskii ◽  
L.I. Yakub
Keyword(s):  
Nuclear Spin ◽  
Magnetic Ordering ◽  
Spin Systems
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