Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.14: Poster
Wednesday, March 24, 2010, 14:00–18:00, Poster D1
Electron spin resonance of the Yb 4f-moment in Yb(Rh1−xCox)2Si2 — •Thomas Gruner, Jörg Sichelschmidt, Christoph Klingner, Cornelius Krellner, Christoph Geibel, and Frank Steglich — Max-Planck-Institut für Chemische Physik fester Stoffe, Dresden, Germany
We present a detailed electron spin resonance (ESR) study on a series of single crystals Yb(Rh1−xCox)2Si2 with Cobalt concentrations x from 0 to 1. All compositions show well defined ESR spectra which can be ascribed to a bulk Yb3+ resonance. The pure system YbRh2Si2 is located in the vicinity of an antiferromagnetic quantum critical point. The magnetic ordering of this system (TN =72 mK) is stabilized by pressure as it is expected for Yb-Kondo lattice compounds. Doping with Cobalt corresponds to applying chemical pressure. Accordingly, the Néel-temperature is increased to TN =1.7 K in the pure system YbCo2Si2, confirming a decrease of the hybridization between conduction electrons and Yb3+ 4f-spins. The anisotropies of the ESR g-factor and the ESR linewidth Δ B for three different frequencies (L, X, Q-band) and in a temperature range from T ≈ 1.5 K to ≈ 10 K are presented and discussed here. A significant decrease of the anisotropy from x=0 to 1 is observed.