This title appears in the Scientific Report :
2006
Please use the identifier:
http://dx.doi.org/10.1016/j.physb.2006.02.007 in citations.
Crystal field effects in the 3d transition metal compounds
Crystal field effects in the 3d transition metal compounds
For most of the ionic 3d transition metal compounds the observed saturation magnetic moment is fairly consistent with the theoretical spin-only value. Verification of the spin quantum number, S, by means of the observed saturation moment is, however, ambiguous because it is not known how much the La...
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Personal Name(s): | Köbler, U. |
---|---|
Hoser, A. / Hoffmann, J.-U. | |
Contributing Institute: |
Streumethoden; IFF-ISM |
Published in: | Physica / B, 382 (2006) S. 98 - 104 |
Imprint: |
Amsterdam
North-Holland Physics Publ.
2006
|
Physical Description: |
98 - 104 |
DOI: |
10.1016/j.physb.2006.02.007 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) Kondensierte Materie |
Series Title: |
Physica B: Condensed Matter
382 |
Subject (ZB): | |
Publikationsportal JuSER |
For most of the ionic 3d transition metal compounds the observed saturation magnetic moment is fairly consistent with the theoretical spin-only value. Verification of the spin quantum number, S, by means of the observed saturation moment is, however, ambiguous because it is not known how much the Lande g-factor deviates from the spin-only value of g = 2.00. We use the universality of the magnetic order parameter at the stable fixed point T = 0 to determine the value of S for T -> 0 consistently. As we have shown earlier, for integer and half-integer spin values different universality classes hold at T = 0. It is therefore possible to get information on whether the spin is integer or half-integer from the temperature power function by which the order parameter approaches saturation. Only for Cr2O3, CoF2 and MnO we have observed that the universality class at T = 0 is not consistent with the theoretical spin only value. This is explained by a relevant crystal field which reduces the number of states, N = 2S + 1, by Delta N = 1. The discrete changes of N are associated with a crossover to another universality class, i.e. to another temperature power function of the order parameter. (c) 2006 Elsevier B.V. All rights reserved. |