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Type: Artigo de periódico
Title: Quantum Critical Kondo Quasiparticles Probed By Esr In β-ybalb 4
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 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. © 2011 American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.107.026402
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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