Magnetic phase diagram of the intermetallic LaMn2-xCuxSi2 silicides

Kilic A., Kervan S., Gencer A.

JOURNAL OF ALLOYS AND COMPOUNDS, cilt.379, sa.1-2, ss.31-35, 2004 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 379 Sayı: 1-2
  • Basım Tarihi: 2004
  • Doi Numarası: 10.1016/j.jallcom.2004.02.028
  • Dergi Adı: JOURNAL OF ALLOYS AND COMPOUNDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.31-35
  • Anahtar Kelimeler: rare-earth compounds, transition metal compounds, magnetically ordered materials, magnetic measurements, x-ray diffraction, differential scanning calorimetry, NEUTRON-DIFFRACTION, SOLID-SOLUTION, RMN2GE2 COMPOUNDS, 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1, TRANSITIONS, LAMN2SI2, LA, DY, ER, ND
  • Ankara Üniversitesi Adresli: Evet

Özet

X-ray diffraction (XRD), differential scanning calorimetry (DSC) techniques and AC magnetic susceptibility measurements have been carried out on polycrystalline LaMn2-xCuxSi2 (0.0 less than or equal to x less than or equal to 1.0) silicides to investigate how the ferromagnetic and antiferromagnetic regions in LaMn2Si2 are affected by Cu substitution. All compounds crystallize in the ThCr2Si2-type structure with the space group 14/mmm. Substitution of Cu for Mn leads to a linear decrease in the lattice constant c and the unit-cell volume V and a linear increase in the lattice constant a. In all the samples, ferromagnetic interactions within the Mn sublattice take place below the Curie temperature T-C(Mn). The onset of ferromagnetism at T-C(Mn) decreases with the copper content from 308 (x = 0) to 82 K (x = 1). The temperature dependence of the AC susceptibility shows a distinct feature for x less than or equal to 0.6 at temperatures below T-C(Mn). These samples have a mixed state composed of ferromagnetic and antiferromagnetic phases. The samples with x < 0.2 have a Neel temperature associated with antiferromagnetic behavior above room temperature. A magnetic phase diagram as a function of Cu concentration in LaMn2-xCuxSi2 has been constructed. (C) 2004 Elsevier B.V. All rights reserved.