Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/68335
Type: Artigo de periódico
Title: High field nuclear magnetic resonance in transition metal substituted BaFe2As2
Author: Garitezi, TM
Lesseux, GG
Rosa, PFS
Adriano, C
Reyes, AP
Kuhns, PL
Pagliuso, PG
Urbano, RR
Abstract: We report high field As-75 nuclear magnetic resonance (NMR) measurements on Co and Cu substituted BaFe2As2 single crystals displaying same structural/magnetic transition T-0 similar or equal to 128 K. From our anisotropy studies in the paramagnetic state, we strikingly found virtually identical quadrupolar splitting and consequently the quadrupole frequency nu(Q) similar or equal to 2: 57(1) MHz for both compounds, despite the claim that each Cu delivers 2 extra 3d electrons in BaFe2As2 compared to Co substitution. These results allow us to conclude that a subtle change in the crystallographic structure, particularly in the Fe-As tetrahedra, must be the most probable tuning parameter to determine T-0 in this class of superconductors rather than electronic doping. Furthermore, our NMR data around T-0 suggest coexistence of tetragonal/paramagnetic and orthorhombic/antiferromagnetic phases between the structural and the spin density wave magnetic phase transitions, similarly to what was reported for K-doped BaFe2As2 [Urbano et al., Phys. Rev. Lett. 105, 107001 (2010)]. (C) 2014 AIP Publishing LLC.
Country: EUA
Editor: Amer Inst Physics
Rights: aberto
Identifier DOI: 10.1063/1.4864442
Date Issue: 2014
Appears in Collections:Unicamp - Artigos e Outros Documentos

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