Magnetic ordering of the R6Fe13Sn (R = Nd, Pr) compounds studied by neutron diffraction

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:218

Article

Schobinger-Papamantellos, P ; Buschow, KHJ ; de Groot, CH ; de Boer, FR ; Ritter, C

关键词: magnetic ordering;    neutron diffraction;    antiferromagnetism;    rare earth compounds;   

DOI  :  10.1016/S0304-8853(00)00351-6

来源: Elsevier

【 摘 要 】

The magnetic ordering of Nd, Fe,, Sn and Pr,Fe,, Sn powder samples was investigated by neutron diffraction. The data analysis reveals a collinear antiferromagnetic magnetic moment arrangement of the four Fe and the two R sublattices associated with the wave Vector q = (0 0 1) corresponding to the I-p magnetic lattice with anticentering translation. The moments of all sublattices located at (x y 0) layers, sandwiched between successive Sn layers perpendicular to z at z = - 0.25, 0.25 are confined to the same direction. These ferromagnetic blocks change their direction collectively when going to the next Sn layers at z = 0.25, 0.75. The structures of the two compounds differ essentially in the preferred direction of antiferromagnetism, which is perpendicular to the c-axis for the Pr,Fe,,Sn compound. For the Nd, Fe,, Sn compound it is along the c-axis for T > 150 K and 10 degrees off the c-axis at 1.5 K. The moment values of the R atoms at 1.5 K are 3.06(7)mu(B) and 2.45(4)mu(B),/Nd atom 2.9(1)mu(B) and 2.70(1)mu(B)/Pr atom while the average Value of the ordered Fe moment is 2.4 mu(B)/Fe for both compounds, in satisfactory agreement with Mossbauer results. (C) 2000 Elsevier Science B.V. All rights reserved.

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