Neutron Diffraction Investigation of the Spiral Magnetic Structure in Cr2BeO4
作者： D. E. Cox , B. C. Frazer , R. E. Newnham , R. P. Santoro
DOI: 10.1063/1.1657557
关键词: Antiferromagnetism 、 Condensed matter physics 、 Neutron diffraction 、 Orthorhombic crystal system 、 Diffraction 、 Materials science 、 Magnetic susceptibility 、 Magnetic structure 、 Magnetism 、 Crystallography 、 Neutron
摘要: Cr2BeO4 is orthorhombic with the olivine (Mg2SiO4) type of crystal structure. Previous magnetic susceptibility, neutron diffraction and AFMR measurements have revealed that compound undergoes an antiferromagnetic transition at about 28°K, probably to a noncollinear spin arrangement. More accurate powder data now been obtained 4.5°K 1.1 2.5 A neutrons which reveal structure cycloidal spiral having propagation vector directed along c axis (Pbnm orientation). The periodicity 65 A, roughly 12 times unit cell length in this direction. observed intensities are accounted for reasonably well by simple model there modulation basic arrangement consisting G mode on Cr(I) inversion sites coupled Cr(II) mirror sites. moments lie ac plane, additional phase factor 90° between Cr ions two kinds site.
scitation.org
harvard.edu
aip.org
sci-hub.se 参考文章(6)
P R Elliston, G J Troup, Antiferromagnetic resonance in chromium chrysoberyl Proceedings of the Physical Society. ,vol. 92, pp. 1040- 1045 ,(1967) , 10.1088/0370-1328/92/4/326
R. E. Watson, A. J. Freeman, Hartree–Fock atomic scattering factors for the iron transition series Acta Crystallographica. ,vol. 14, pp. 27- 37 ,(1961) , 10.1107/S0365110X61000048
R. P. SANTORO, R. E. NEWNHAM, Magnetic Properties of Chromium Chrysoberyl Journal of the American Ceramic Society. ,vol. 47, pp. 491- 492 ,(1964) , 10.1111/J.1151-2916.1964.TB13796.X
R. P. Santoro, R. E. Newnham, Antiferromagnetism in LiFePO4 Acta Crystallographica. ,vol. 22, pp. 344- 347 ,(1967) , 10.1107/S0365110X67000672
C. E. Weir, A. van Valkenburg, Studies of Beryllium Chromite and Other Beryllia Compounds With R2O3 Oxides. Journal of Research of the National Bureau of Standards Section A: Physics and Chemistry. pp. 103- 106 ,(1960) , 10.6028/JRES.064A.008
R. E. Newnham, E.F. Farrell, J. H Fang, Refinement of the chrysoberyl structure American Mineralogist. ,vol. 48, pp. 804- 810 ,(1963)