ACTA

Magnetic Behaviour and Electronic Structure of the R₂PdSi₃ (R = Ce, Nd, Tb-Er) Compounds

A. Szytuła^a, M. Hofmann^b, B. Penc^a, M. Ślaski^c, Subham Majumdar^d, E.V. Sampathkumaran^d and A. Zygmunt^e
^a Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
^b Berlin Neutron Scattering Centre, Hahn-Meitner Institute, 14109 Berlin-Wannsee, Germany
^c School of Physics and Space Research, University of Birmingham, Birmingham, UK
^d Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai 400005, India
^e W. Trzebiatowski Institute of Low Temperatures and Structural Research, Polish Academy of Sciences, Okólna 2, 50-950 Wrocław, Poland

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The magnetic properties including the magnetic structure were determined by magnetometric and neutron diffraction measurements of the polycrystalline samples of R₂ PdSi₃ (R = Ce, Nd, Tb-Er). In Ce₂PdSi₃ the Ce moments order below 2.5 K. The Nd magnetic moments in Nd₂PdSi₃ exhibit ferromagnetic ordering below 17 K. In Tb₂PdSi₃, a complex situation is observed: in the temperature range from 1.5 K to (T_N=25 K), there is a coexistence of a ferromagnetic spiral (about 75% of the magnetic moment) and a spin-glass (about 25%). For the Dy, Ho, and Er compounds, below T_N (7.5, 8, and 7 K respectively), sinusoidally modulated structures are observed. The valence band and the core level photoemissions of 4d of rare-earth metal, 3d Pd, 2s and 2p Si were investigated by X-ray photoemission spectroscopy measurements.

DOI: 10.12693/APhysPolA.97.823
PACS numbers: 71.20.-b, 75.30.Cr, 75.30.Kz, 79.60.-i