TY  - JOUR
AU  - Köbler, U.
AU  - Hoser, A.
AU  - Hoffmann, J.-U.
AU  - Thomas, C.
TI  - One-dimensional bulk ferromagnets: NdAl2 and hcp cobalt
JO  - Solid state communications
VL  - 137
SN  - 0038-1098
CY  - New York, NY [u.a.]
PB  - Elsevier Science
M1  - PreJuSER-57845
SP  - 301 - 305
PY  - 2006
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000235426400005
DO  - DOI:10.1016/j.ssc.2005.11.041
UR  - https://juser.fz-juelich.de/record/57845
ER  -