E. Šantavá

The analysis of the specific heat of RFe2Si2 compounds

The series of isostructural intermetallics RFe 2 Si 2 (R = La, Pr, Nd) crystallizes in the tetragonal ThCr 2 Si 2 -type structure with the space group I4/mmm. The specific heat of high-quality single crystals PrFe 2 Si 2 and NdFe 2 Si 2 was studied in comparison with nonmagnetic polycrystalline LaFe 2 Si 2 in the 1.5-300K temperature region. The detailed analysis of the specific heat yielded the magnetic entropy and the crystal field level scheme of both crystals.

Specific features of the formation of the ground state in PrB6

The temperature dependences of the thermal conductivity and magnetization of a PrB6 single crystal in magnetic fields of 0–14 T have been measured. An analysis of the data amassed has revealed that, apart from the well-known magnetic phase transitions at T ∼ 7 and ∼4 K, there appears a spontaneous magnetization with a relatively small magnetic moment in PrB6 at temperatures below 20 K, which is initiated by the splitting of the ground state, apparently, due to dynamic structure distortions.

Influence of Ru on the Magnetic Properties of Y2T17 (T = Co, Fe)

Influence of Ru substitution on magnetic properties of Y2Fe17 and Y2Co17 (hexagonal structure of the Th2Ni17-type) has been studied on single-crystalline samples. Whereas in the Y2Fe17-xRux system ferromagnetism is transformed rapidly into antiferromagnetism with a field-induced metamagnetic transition, in Y2Co17-xRux only a monotonous decrease of spontaneous magnetic moment, Curie temperature and first anisotropy constant is observed.