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Type: Artigo de periódico
Title: Quantum Critical Kondo Quasiparticles Probed By Esr In β-ybalb₄.
Author: Holanda, L M
Vargas, J M
Iwamoto, W
Rettori, C
Nakatsuji, S
Kuga, K
Fisk, Z
Oseroff, S B
Pagliuso, P G
Abstract: Electron spin resonance (ESR) can probe conduction electrons (CE) and local moment (LM) spin systems in different materials. A CE spin resonance (CESR) is observed in metallic systems based on light elements or with enhanced Pauli susceptibility. LM ESR can be seen in compounds with paramagnetic ions and localized d or f electrons. Here we report a remarkable and unprecedented ESR signal in the heavy-fermion superconductor β-YbAlB₄ [S. Nakatsuji et al., Nature Phys. 4, 603 (2008)] which behaves as a CESR at high temperatures and acquires characteristics of the Yb³⁺ LM ESR at low temperature. This dual behavior strikes as an in situ unique observation of the Kondo quasiparticles in a quantum critical regime. The proximity to a quantum critical point may favor the appearance of this dual character of the ESR signal in β-YbAlB₄.
Rights: aberto
Identifier DOI: 
Date Issue: 2011
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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