Regensburg 2010 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 26: CE: Heavy Fermions
TT 26.3: Vortrag
Mittwoch, 24. März 2010, 14:30–14:45, H21
Ferromagnetic 4f Correlations in the Oxypnictides CeFe1−xRuxPO: A 31P NMR Study — •Eva Maria Brüning, Cornelius Krellner, Michael Baenitz, Christoph Geibel, and Frank Steglich — Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
CeTPO (T = Ru, Os, Fe), homologues of the new oxypnictide superconductors, show dissimilar types of ground states. CeRuPO is a rare example of a ferromagnetically ordered Kondo-lattice system (TC=15 K), whereas CeOsPO shows antiferromagnetic order and weak Kondo interaction (TN= 3.5 K) [1]. CeFePO is a paramagnetic heavy fermion system in the vicinity of ferromagnetic order [2]. Therefore it became very interesting to investigate the solid solution series CeFe1−xRuxPO (x = 0.1, 0.2) to trace the crossover from a ferromagnetically correlated heavy fermion system (x = 0) to a ferromagnetically ordered metal (x = 1) through a possible quantum critical point. We applied the microscopic NMR method on polycrystals and performed a temperature and field dependent 31P NMR study. The investigations of the Knight shift 31K(T) and spin-lattice-relaxation rate 31(1/T1) of the new systems CeFe1−xRuxPO (x = 0, x = 0.1, x= 0.2) are presented.
[1] C. Krellner, N. S. Kini, E. M. Brüning, K. Koch, H. Rosner, M. Nicklas, M. Baenitz, C. Geibel Phys. Rev. B, 76; 104418 (2007)
[2] E. M. Brüning, C. Krellner, M. Baenitz, A. Jesche, C. Geibel, F. Steglich, Phys. Rev. Lett, 101; 117206 (2008)