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Field-dependent collective ESR mode in YbRh2Si2

  • Author(s): Holanda, LM
  • Duque, JGS
  • Bittar, EM
  • Adriano, C
  • Pagliuso, PG
  • Rettori, C
  • Hu, RW
  • Petrovic, C
  • Maquilon, S
  • Fisk, Z
  • Huber, DL
  • Oseroff, SB
  • et al.

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.

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