PrMn1.6Fe0.4Ge2 Alaşımının Curie Sıcaklığı Üzerindeki Antiferromanyetik Yapısı

Abstract

ThCr2Si2-tipi kristal yapılı PrMn1.6Fe0.4Ge2 alaşımının manyetik özelliği ve manyetik yapısı zayıf alan mıknatıslanma ölçümü ve nötron toz kırınımı ile incelenmiştir. Düşük alan mıknatıslanma ölçümleri Curie sıcaklığının üzerinde antiferromagnetik düzenlenimin olduğunu göstermektedir. Bu antiferromagnetik düzenlenimin manyetik yapısı, Curie sıcaklığı = 230 K’ in üzerinde değişik sıcaklıklarda nötron toz kırınımı ile belirlenmiştir.

Keywords

• Manyetik ölçümler, Manyetik yapı, Nötron toz kırınımı

Antiferromagnetic Structure of the PrMn1.6Fe0.4Ge2 Compound above Curie Temperature

Abstract

The magnetic properties and structure of PrMn1.6Fe0.4Ge2 compound that crystallize in ThCr2Si2-type tetragonal structure (space group: I4/mmm) have been investigated by magnetic measurements and neutron diffraction experiments. The result of magnetic measurements in a weak external field shows that there is an antiferromagnetic ordering above Curie temperature. The magnetic structure of this antiferromagnetic ordering has been determined by powder neutron diffraction at the different temperature above Curie temperature T = 230 K.

Keywords

• Magnetic measurements, Magnetic structure, Neutron powder diffraction

References

1. 1. Duman E, Acet M, Elerman Y, Elmali A, Wassermann E F. Magnetic interactions in Pr1-xTbxMn2Ge2, J. Magn. Magn. Mater. 238, 11-21 (2002).
2. 2. Elerman Y, Dincer I, Elmali A, Ehrenberg H, Fuess H, Duman E, Acet M. Magnetic properties of Pr1- xGdxMn2Ge2, J. Phys: Condens. Matter. 16, 405-414 (2004).
3. 3. Ban Z, Sikirica M. The Crystal Structure of Ternary Silicides ThM2Si2 (M = Cr, Mn, Fe, Co, Ni and Cu), Acta Crystallogr. 18, 594-599 (1965).
4. 4. Szytula A, Leciejewicz J, in Handbook on the Physics and Chemistry of Rare Earths, edited by K. A. Gschneider, Jr. and L. Erwin, Elsevier, Amsterdam, Vol. 12, pp. 133, (1989).
5. 5. Nowık I, Levi Y, Felner I, Bauminger E R. New multiple magnetic phase transitions and structures, J. Magn. Magn. Mater. 147, 373-384, (1995).
6. 6. Welter R, Venturini G, Ressouche E, Malaman B. Neutron diffraction study of CeMn2Ge2, PrMn2Ge2 and NdMn2Ge2: evidence of dominant antiferromagnetic components within (001) Mn planes in ferromagnetic ThCr2Si2-type manganese ternary compounds, J. Alloys Compounds, 218, 204- 215, (1995).
7. 7. Venturini G, Welter R, Ressouche E, Malaman B. Neutron diffraction study of Nd0.35La0.65Mn2Si2: A SmMn2Ge2-like magnetic behaviour comound, J. Magn. Magn. Mater. 150, 197-212, (1995).
8. 8. Ijjaali I, Venturini G, Malaman B, Ressouche E. Neutron diffraction study of the La1-xYxMn2Si2 solid solution (0 ≤ x ≤ 1), J. Alloys Compounds, 266, 61-70, (1998).

9. 9. Rodriguez-Carvajal J. Recent advances in magnetic structure determination by neutron powder diffraction, Physica B. 192, 55-69, (1993).
10. 10. Lange R J, Fisher I R, Canfield PC, Antropov V P, Lee S J, Harmon B N, Lynch D W. Observation of a metamagnetic phase transition in an itinerant 4f system via the magneto-optic Kerr effect: Ce(Fe1- xCox)2, Phys. Rev B, 62, 7084-7092, (2000).
11. 11. Cullity B D, Introduction to Magnetic Materials, Addison-Wesley, Massachusets, (1972).