Magnetic ordering of the Pr sublattice with the substitution of Cu for Mn in PrMn2Si2 intermetallics
JOURNAL OF PHYSICS-CONDENSED MATTER, cilt.16, sa.47, ss.8669-8674, 2004 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 16 Sayı: 47
- Basım Tarihi: 2004
- Doi Numarası: 10.1088/0953-8984/16/47/018
- Dergi Adı: JOURNAL OF PHYSICS-CONDENSED MATTER
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Sayfa Sayıları: ss.8669-8674
- Ankara Üniversitesi Adresli: Hayır
Özet
The magnetic properties of PrMn2-x, CuxSi2 (0 less than or equal to x less than or equal to1) were studied by field-cooled and zero-field-cooled magnetization measurements in the temperature range 5 K less than or equal to T less than or equal to 350 K in low external fields (5 mT) and by magnetic-field-dependent magnetization measurements in fields up to 5.5 T. 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. Earlier neutron diffraction experiments showed that Pr does not order down to 1.6 K in PrMn2Si2 while the ferromagnetic Mn planes are ordered antiparallel aiong the c axis. With the increasing Cu. content, the magnetization increases rapidly at low temperatures for the samples with 0.4 less than or equal to x less than or equal to 1. Cu substitution strongly changes the magnetic properties and leads to the magnetic ordering of the Pr sublattice. This is mainly deduced from the discussion of the values of the magnetic moments at low temperatures. Below the Curie temperatures T-C, the spins in the Mn sublattice are arranged parallel to the Pr sublattice. With increasing Cu, TC (x) has a maximum value of 155 K at x = 0.6 and decreases for samples with x greater than or equal to 0.7.