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Neutron diffraction study of RMn4Al8 (R = Nd,Dy, Ho,Er), ErCr4Al8 and ErCu4Al8 |
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| Authors: | G Baio O Moze G Amoretti R Sonntag N Stüße K H J Buschow |
| Institution: | 1. Istituto Nazionale per la Fisica della Materia, Dipartimento di Fisica, Università di Parma, Viale della Scienze, I-43100, Parma, Italy 2. Hahn-Meitner Institut, Glienicker Strasse 100, D-14109, Berlin, Germany 3. Institute of Crystallography, Universit?t Tübingen, D-72070, Tübingen, Germany 4. Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstrasse, 651018, XE Amsterdam, The Netherlands |
| Abstract: | Neutron powder diffraction has been used to investigate the magnetic order in a series of RMn4Al8 (space group I4/mmm) compounds with R = (Nd, Dy, Ho and Er). For compounds with Mn, no magnetic order was detected down to 1.6 K, whilst for the compound ErCr4Al8, two very weak magnetic reflections were observed at 1.6 K. The observed magnetic peaks cannot be indexed on the tetragonal unit cell, indicating a possible incommensurate magnetic structure. For ErCu4Al8, a type 1 antiferromagnetic structure is observed. The magnitude and temperature dependence of the Er3+ magnetic moment can be adequately modelled by a combined isotropic exchange and tetragonal crystal field Hamiltonian within the Mean Field Approximation. |
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