Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 43: Correlated Electrons: Heavy Fermions 2

TT 43.7: Vortrag

Donnerstag, 26. März 2009, 17:30–17:45, HSZ 301

Electronic structure and thermodynamic properties of CeRh₂Sn₄ — •Monika Gamza^{1, 2}, Walter Schnelle¹, Roman Gumeniuk¹, Yuri Prots¹, Andrzej Slebarski², Helge Rosner¹, and Yuri Grin¹ — ¹MPI for Chemical Physics of Solids, Dresden — ²Institute of Physics, University of Silesia, Katowice, Poland

Compounds of the system Ce–Rh–Sn have attracted a considerable attention due to a variety of strongly correlated electron phenomena, including valence fluctuations, non-Fermi liquid behavior, heavy fermion states and magnetism with reduced moments [1, 2]. Some of these systems show also evidence for spin fluctuations due to the Rh 4d electrons [2].

Here, we present a combined study of the electronic structure and thermodynamic properties of CeRh₂Sn₄. The crystal structure has been determined from single crystal diffraction experiments. The Ce core-level XPS and Ce L_III XAS spectra unanimously indicate a stable 4f¹ configuration of the Ce ions. Thermodynamic measurements show a magnetic phase transition at T_N ≈ 3.16 K. The ground state magnetic structure is of a noncollinear antiferromagnetic type. There are clear indications for spin fluctuations in the thermodynamic data. A Fermi surface analysis reveals some parallel sections of the sheets, which could generate nesting instabilities and be responsible for the spin fluctuations.

[1] Ślebarski A et al. Philos. Mag. B (2002) 82 943;

[2] Gamża M et al. J. Phys.: Condens. Matter (2008) 20 025201; Ślebarski A et al. Phys. Rev. B (2006) 73 2051105