- Holanda, LM;
- Duque, JGS;
- Bittar, EM;
- Adriano, C;
- Pagliuso, PG;
- Rettori, C;
- Hu, RW;
- Petrovic, C;
- Maquilon, S;
- Fisk, Z;
- Huber, DL;
- Oseroff, SB
Electron spin resonance (ESR) experiments in YbRh2Si2 Kondo lattice (TK ≃ 25 K) at different field/frequencies (4.1 ≤ ν ≤ 34.4 GHz) and H⊥ c revealed: (i) a strong field dependent Yb3 + spin-lattice relaxation, (ii) a weak field and T-dependent effectiveg -value, (iii) a suppression of the ESR intensity beyond 15% of Lu-doping, and (iv) a strong sample and Lu-doping (≤ 15 %) dependence of the ESR data. These results suggest that the ESR signal in YbRh2Si2 may be due to a coupled Yb3 +-conduction electron resonant collective mode with a subtle field-dependent spins dynamic. © 2009 Elsevier B.V. All rights reserved.
