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000057845 084__ $$2WoS$$aPhysics, Condensed Matter
000057845 1001_ $$0P:(DE-Juel1)VDB787$$aKöbler, U.$$b0$$uFZJ
000057845 245__ $$aOne-dimensional bulk ferromagnets: NdAl2 and hcp cobalt
000057845 260__ $$aNew York, NY [u.a.]$$bElsevier Science$$c2006
000057845 300__ $$a301 - 305
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000057845 520__ $$aIt 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.
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000057845 65320 $$2Author$$alow-dimensional systems
000057845 65320 $$2Author$$aferromagnetism
000057845 65320 $$2Author$$aneutron diffraction
000057845 7001_ $$0P:(DE-Juel1)VDB655$$aHoser, A.$$b1$$uFZJ
000057845 7001_ $$0P:(DE-HGF)0$$aHoffmann, J.-U.$$b2
000057845 7001_ $$0P:(DE-Juel1)VDB1640$$aThomas, C.$$b3$$uFZJ
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000057845 8567_ $$uhttp://dx.doi.org/10.1016/j.ssc.2005.11.041
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