Investigation of LaMn2-xFexSi2 (0 ≤ x ≤ 1.2) by magnetic measurements and neutron diffraction

DİNÇER İ., ELMALI A., Elerman Y., Ehrenberg H., Fuess H., Daoud-Aladine A.

Journal of Alloys and Compounds, cilt.403, sa.1-2, ss.53-64, 2005 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 403 Sayı: 1-2
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.jallcom.2005.05.013
  • Dergi Adı: Journal of Alloys and Compounds
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.53-64
  • Anahtar Kelimeler: Magnetic measurements, Magnetic structure, Neutron diffraction, Rare-earth compounds, Transition metal compounds
  • Ankara Üniversitesi Adresli: Evet

Özet

The various magnetic structures and phase transitions in the LaMn 2 - xFexSi2 system have been thoroughly studied by X-ray powder diffraction, magnetic measurements and powder neutron diffraction. The substitution of Fe for Mn leads to a decrease in the lattice parameters and the magnetic interactions in the Mn sublattice crossover from a ferromagnetic character to an antiferromagnetic one. For the x = 0.475 sample, a field-induced metamagnetic transition from canted antiferromagnetism to canted ferromagnetism occurs at about 3 kOe. The magnetic structures of the LaMn 2 - xFexSi2 compounds with x = 0.2, 0.475, 0.5, 0.7 and 1.0 have been determined between 2 and 450 K by neutron diffraction. A typical SmMn2Ge2-like magnetic behavior is observed for the x = 0.475 sample. The magnetic phase transition from ferromagnetism to antiferromagnetism for this sample occurs at the intra-layer Mn-Mn distance dMn-Mna=2.89 Å. This value exceeds the well-known corresponding threshold value dMn-Mna=2.87 Å in the RMn2X2 compounds. The results are summarized in the LaMn2 - xFexSi2 magnetic phase diagram. © 2005 Elsevier B.V. All rights reserved.