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Type: Artigo de periódico
Title: Magnetic field dependence and bottlenecklike behavior of the ESR spectra in YbRh2Si2
Author: Duque, JGS
Bittar, EM
Adriano, C
Giles, C
Holanda, LM
Lora-Serrano, R
Pagliuso, PG
Rettori, C
Perez, CA
Hu, RW
Petrovic, C
Maquilon, S
Fisk, Z
Huber, DL
Oseroff, SB
Abstract: Electron spin resonance (ESR) experiments at different fields or frequencies (4.1 <=nu <= 34.4 GHz) in the Kondo lattice (T-K similar or equal to 25 K) YbRh2Si2 single-crystal compounds confirmed the observation of a single anisotropic Dysonian resonance with g(perpendicular to c)congruent to 3.55 and no hyperfine components for 4.2 less than or similar to T less than or similar to 20 K. However, our studies differently reveal that (i) the ESR spectra for H-perpendicular to c show strong-field-dependent spin-lattice relaxation, (ii) a weak-field and temperature-dependent effective g value, (iii) a dramatic 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 a different scenario where the ESR signal may be associated to a coupled Yb3+-conduction electron resonant collective mode with a strong bottleneck and dynamiclike behavior.
Subject: Kondo effect
paramagnetic resonance
rhodium alloys
silicon alloys
spin-lattice relaxation
ytterbium alloys
Country: EUA
Editor: Amer Physical Soc
Citation: Physical Review B. Amer Physical Soc, v. 79, n. 3, 2009.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.79.035122
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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