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Type: Artigo de periódico
Title: Distinct High-T Transitions in Underdoped Ba1-xKxFe2As2
Author: Urbano, RR
Green, EL
Moulton, WG
Reyes, AP
Kuhns, PL
Bittar, EM
Adriano, C
Garitezi, TM
Bufaical, L
Pagliuso, PG
Abstract: In contrast with the simultaneous structural and magnetic first order phase transition T-0 previously reported, our detailed investigation on an underdoped Ba0.84K0.16Fe2As2 single crystal unambiguously revealed that the transitions are not concomitant. The tetragonal (tau: I4/mmm)-orthorhombic (theta: Fmmm) structural transition occurs at T-S similar or equal to 110 K, followed by an adjacent long-range antiferromagnetic (AFM) transition at T-N similar or equal to 102 K. Hysteresis and coexistence of the tau and theta phases over a finite temperature range observed by NMR experiments confirm the first order character of the tau-theta transition and provide evidence that both T-S and T-N are strongly correlated. Our data also show that superconductivity develops in the theta phase below T-c = 20 K and coexists with AFM. This new observation, T-S not equal T-N, firmly establishes another similarity between the hole-doped BaFe2As2 and the electron-doped iron-arsenide superconductors.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevLett.105.107001
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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