This title appears in the Scientific Report :
2006
Please use the identifier:
http://dx.doi.org/10.1016/j.ssc.2005.11.041 in citations.
One-dimensional bulk ferromagnets: NdAl2 and hcp cobalt
One-dimensional bulk ferromagnets: NdAl2 and hcp cobalt
It is shown experimentally that NdAl2 and hcp cobalt are one-dimensional (1D) bulk ferromagnets. For hcp cobalt this is only under the condition that the sample is magnetically saturated, i.e. that all moments are aligned parallel to the hexagonal c-axis. In 1D magnets the transverse interactions ne...
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Personal Name(s): | Köbler, U. |
---|---|
Hoser, A. / Hoffmann, J.-U. / Thomas, C. | |
Contributing Institute: |
Neutronenstreuung; IFF-INS Streumethoden; IFF-ISM |
Published in: | Solid state communications, 137 (2006) S. 301 - 305 |
Imprint: |
New York, NY [u.a.]
Elsevier Science
2006
|
Physical Description: |
301 - 305 |
DOI: |
10.1016/j.ssc.2005.11.041 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) Kondensierte Materie |
Series Title: |
Solid State Communications
137 |
Subject (ZB): | |
Publikationsportal JuSER |
It is shown experimentally that NdAl2 and hcp cobalt are one-dimensional (1D) bulk ferromagnets. For hcp cobalt this is only under the condition that the sample is magnetically saturated, i.e. that all moments are aligned parallel to the hexagonal c-axis. In 1D magnets the transverse interactions need not to be zero but must be sufficiently weak such that the transverse correlation length does not diverge at the critical temperature. The transverse interactions are then not relevant and the phase transition is driven by the longitudinal interactions. On the other hand, magnetic Bragg scattering relies on finite transverse correlations. For NdAl2 no conventional magnetic Bragg scattering is observed if all moments are aligned vertical to the scattering plane by a magnetic field. For hcp cobalt the scattering intensity is considerably reduced in this geometry instead of having its maximum. From this observation it can be concluded that the transverse correlation length is practically zero in NdAl2 but has a finite value in hcp cobalt. The macroscopic magnetization shows normal ferromagnetic saturation. (c) 2005 Elsevier Ltd. All rights reserved. |