Thermodynamic and Electronic Properties of DyNi$_{4}$Si Compound

Electronic and thermodynamic properties of the ternary DyNi4Si compound, crystallizing in the hexagonal CaCu5 structure (P6/mmm space group) were studied by X-ray photoelectron spectroscopy (XPS) and heat capacity measurements. DyNi4Si is ferromagnetic with magnetic moment 7.9 muB/f.u. at 4.2 K (in H = 9 T) and Curie temperature TC = 11 K. The heat capacity measurements have shown that DyNi4Si is characterized by electronic heat capacity coefficient gamma = 72 mJ/mol K. Zero field heat capacity reveals a peak close to the magnetic ordering temperature, which gets suppressed in an applied field of 5 T. The valence band of the XPS spectra is determined mainly by the Ni(3d) and Dy(4f) contributions. The slight shift of peaks' positions towards the higher binding energy by about 0.3 eV in respect to the pure Dy is probably due to the different crystalline electric field for Dy in the DyNi4Si compound.

[1]  M. Falkowski,et al.  Magnetic properties of hexagonal RNi4Si (R = rare earth) compounds , 2007 .

[2]  M. Falkowski,et al.  Electronic Structure and Thermoelectric Power of CeNi4Si. , 2007 .

[3]  A. Kowalczyk,et al.  Electronic structure and thermoelectric power of CeNi4Si , 2007 .

[4]  G. Chełkowska,et al.  Magnetic properties and electronic structure of GdNi4Si compound , 2006 .

[5]  G. Chełkowska,et al.  Valence state and magnetism of CeNi4Si and YbNi4Si , 2006 .

[6]  T. Toliński,et al.  Physical properties of the RNi4Cu (R = rare earth) compounds , 2006 .

[7]  A. Hoser,et al.  Magnetic properties of TbNi4Al and DyNi4Al compounds: investigation via neutron diffraction and magnetometry , 2004 .

[8]  A. Hoser,et al.  Neutron diffraction, magnetic, and transport studies of NdNi 4 Al , 2003 .

[9]  A. Tari,et al.  The Specific heat of matter at low temperatures , 2003 .

[10]  J. Kováč,et al.  Magnetic properties of hexagonal RNi4B (R=Ce, Nd, Gd, Dy) compounds , 2002 .

[11]  J. Blanco,et al.  Resistivity anomalies in ferromagnetic RNi5 (R=Tb, Dy or Er) compounds , 1994 .

[12]  K. Buschow,et al.  Intermetallic compounds of rare-earth and 3d transition metals , 1977 .

[13]  E. A. Nesbitt,et al.  Magnetic Moments of Intermetallic Compounds of Transition and Rare‐Earth Elements , 1962 .

[14]  G. Miletić,et al.  Electronic structure and magnetic properties of selected compounds in the DyNi5−xAlx system , 2004 .

[15]  W. Wallace,et al.  Rare Earth Intermetallics , 1973 .