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Condensed Matter Seminars

ics Condensed Matter
Monday, January 19, 2004
4:00 PM
Physics Building, Room 204
Note special date.
Note special time.
Note special room.
Oleksandr Prokhnenko [Host: Despina Louca]
Institute of Physics, Academy of Sciences of the Czech Republic
"Magnetic Structures and Magnetovolume Anomalies in R2Fe17 intermetallic compounds"
Effects of high pressure and Mn substitution on the creation and evolution of different magnetic structures in R2Fe17 compounds with non-magnetic rare earths R = Y, Ce, Lu were studied by both microscopic (neutron diffraction) and macroscopic (magnetization) techniques. Main results show instability of the ferromagnetic ground state in all compounds whereas range of stability of incommensurate antiferromagnetic phase expands down to the lowest temperatures. This effect is described in terms of distance dependent interlayer exchange interaction giving the value of the lattice c-parameter as a critical parameter for the appearance of the ferromagnetic – antiferromagnetic transition in studied compounds.

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