Conduction Electron Spin Resonance In The Alpha-yb1-xfexalb4 (0 <= X <= 0.50) And Alpha-lualb4 Compounds

dc.creatorHolanda
dc.creatorL. M.; Lesseux
dc.creatorG. G.; Magnavita
dc.creatorE. T.; Ribeiro
dc.creatorR. A.; Nakatsuji
dc.creatorS.; Kuga
dc.creatorK.; Fisk
dc.creatorZ.; Oseroff
dc.creatorS. B.; Urbano
dc.creatorR. R.; Rettori
dc.creatorC.; Pagliuso
dc.creatorP. G.
dc.date2015-Jul
dc.date2016-06-07T13:13:24Z
dc.date2016-06-07T13:13:24Z
dc.date.accessioned2018-03-29T01:34:30Z
dc.date.available2018-03-29T01:34:30Z
dc.identifier
dc.identifierConduction Electron Spin Resonance In The Alpha-yb1-xfexalb4 (0 <= X <= 0.50) And Alpha-lualb4 Compounds. Iop Publishing Ltd, v. 27, p. Jul-2015.
dc.identifier0953-8984
dc.identifierWOS:000356082300014
dc.identifier10.1088/0953-8984/27/25/255601
dc.identifierhttp://iopscience.iop.org/article/10.1088/0953-8984/27/25/255601/meta;jsessionid=816B6ADDBD21C1D78FFA2E29D24986F5.c1.iopscience.cld.iop.org
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/241478
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1305176
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionbeta-YbAlB4 has become one of the most studied heavy fermion systems since its discovery due to its remarkable physical properties. This system is the first reported Yb-based heavy-fermion superconductor (HFS) for which the low-T superconducting state emerges from a non-fermi-liquid (NFL) normal state associated with quantum criticality Nakatsuji et al 2008 Nature 4 603. Additionally, it presents a striking and unprecedented electron spin resonance (ESR) signal which behaves as a conduction electron spin resonance (CESR) at high temperatures and acquires features of the Yb3+ local moment ESR at low temperatures. The latter, also named Kondo quasiparticles spin resonance (KQSR), has been defined as a 4f-ce strongly coupled ESR mode that behaves as a local probe of the Kondo quasiparticles in a quantum critical regime, Holanda et al 2011 Phys. Rev. Lett. 107 026402. Interestingly, beta-YbAlB4 possesses a previously known structural variant, namely the alpha-YbAlB4, phase which is a paramagnetic Fermi liquid (FL) at low temperatures Macaluso et al 2007 Chem. Mater. 19 1918. However, it has been recently suggested that the alpha-YbAlB4 phase may be tuned to NFL behavior and/or magnetic ordering as the compound is doped with Fe. Here we report ESR studies on the alpha-Yb1-xFexAlB4 (0 <= x <= 0.50) series as well as on the reference compound alpha-LuAlB4. For all measured samples, the observed ESR signal behaves as a CESR in the entire temperature range (10K less than or similar to T less than or similar to 300 K) in clear contrast with what has been observed for beta-YbAlB4. This striking result indicates that the proximity to a quantum critical point is crucial to the occurrence of a KQSR signal.
dc.description27
dc.description25
dc.description
dc.description
dc.description
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionAFOSR MURI (USA)
dc.descriptionNSF (USA)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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dc.description
dc.description
dc.languageen
dc.publisherIOP PUBLISHING LTD
dc.publisher
dc.publisherBRISTOL
dc.relationJOURNAL OF PHYSICS-CONDENSED MATTER
dc.rightsfechado
dc.sourceWOS
dc.subjectSystem Beta-ybalb4
dc.subjectHeavy
dc.subjectAbsorption
dc.subjectMetals
dc.titleConduction Electron Spin Resonance In The Alpha-yb1-xfexalb4 (0 <= X <= 0.50) And Alpha-lualb4 Compounds
dc.typeArtículos de revistas


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