Neutron diffraction study on PrMn2-xFexGe2 and general magnetic phase diagram for RMn2-xFexGe2 (R : La-Sm)

Dincer I., Elmali A., Elerman Y., Ehrenberg H., Fuess H., Andre G.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.416, sa.1-2, ss.22-30, 2006 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 416 Sayı: 1-2
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1016/j.jallcom.2005.08.027
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.22-30
  • Anahtar Kelimeler: rare earth manganese germanides, magnetic structures, neutron diffraction, magnetic phase diagram, magnetic measurements, SOLID-SOLUTION, R=RARE EARTH, RARE-EARTH, TRANSITIONS, MN, SYSTEM, 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1, RMN(2)SI(2-X)GE(X), SILICIDES, CEMN2GE2
  • Ankara Üniversitesi Adresli: Hayır

Özet

We have investigated the magnetic structures and phase transitions of PrMn2-xFexGe2 (0 <= x <= 1) by the temperature dependence of weak-field magnetization and powder neutron diffraction. For the x = 0.6 sample, a typical SmMn2Ge2-like magnetic behavior is observed. The magnetic structures of the samples with x = 0.6, 0.8 and 1 have been determined between 1.5 and 305 K. Above T-C(inter) (x = 0.6) and T-N(inter) (x = 0.8 and 1) up to T-N(inter), these samples exhibit an intralayer antiferromagnetic structure in (001) Mn planes. For x = 0.6 sample, the magnetic structure is canted ferromagnetic along the c-axis between T-N(inter) and T-C(inter) and T-C(Pr). For the samples with x = 0.8 and 1, the magnetic structure is canted antiferromagnetic along the c-axis below T-N(inter). Pr moments order ferromagnetically along the c-axis for the x = 0.6 sample below T-C(Pr). The results are summarized in the PrMn2-xFexGe2 magnetic phase diagram. The general magnetic phase diagram for RMn2-xFexGe2 (R: La, Ce, Pr, Nd and Sm) is also constructed from previous and present works. For these compounds, the magnetic phase transition from ferromagnetic to antiferromagnetic occurs at different intralayer Mn-Mn distances for each system. These critical distances are larger than the corresponding threshold value d(Mn-Mn)(a) = 2.87 angstrom for the ternary end-member RMn2X2 compounds. (c) 2005 Elsevier B.V. All rights reserved.