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Anomalous structural properties of some RCu2Ge2 compounds (R = La, Gd-Tm)

Rusinek D., Niewolski J., Czub J., Gondek Ł, Szytuła A.

Materials Science Poland

2013

Vol. 31, No. 4

495--500

In this paper, we address the issue of possible quadrupole ordering in RCu2Ge2 compounds. In the literature, there are reports on anomalous behaviour of lattice parameters, however, lack of high quality data makes the relevant analysis dubious. Therefore, we attempt to perform precise, non-ambient XRD measurements within 12 – 300 K temperature range. Our results confirm peculiar temperature behaviour of the c-lattice parameter that exhibits a well defined minimum at about 60 – 120 K for majority of investigated compounds. However, in contrast to the literature, the anomalous behaviour does not exhibit discontinuities. On the other hand, such behaviour has been evidenced for La-based compounds (LaCu2Ge2 and LaNi2Ge2), where the 4f orbitals are unoccupied.

About negative magnetization in non-superconducting intermetallics

Suski W.

Materials Science Poland

2007

Vol. 25, No. 2

333--341

The negative magnetization for ternary and pseudoternary compounds with the tetragonal ThMn12 and rhombohedral Th2Zn17 type structure is presented considering various magnetic ordering types. This phenomenon has been observed in compounds of rare earth and uranium. Comparing pecularities of the temperature dependence of the magnetization/magnetic susceptibility we try to find a common reason for this behaviour. The most attractive seems to be the difference in the anisotropy magnitude and direction of the individual magnetic sublattices as well as the crystallographic imperfections.

Magnetic properties of the RMn12-xTx alloys in high magnetic field

Suski W., Belan B., Gilewski A., Mydlarz T., Wochowski K.

Materials Science

2003

Vol. 21, No. 1

107-113

The structure and magnetic properties of the tetragonal ThMn12 - type RMn12-xTx alloys (R=Nd, Sm; T=Co, Ni) have been studied in broad magnetic field ranges (up to 35 T). High pulsed magnetic field is applied at T = 4.2 K with the pulse duration of 10 ms. The NdMn12-xNix system has been investigated additionally in the temperature range extended up to about 750 K. The ternaries exist in, approximately, the 4 => x => 8 composition range. The alloys with x ~4 are frequently paramagnetic in a broad temperature range, whereas for other compositions complicated magnetic properties are observed. The results are discussed in relation to the free-ion values of the Nd and Sm ions .