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|Type:||Artigo de periódico|
|Title:||Distinct High-T Transitions in Underdoped Ba1-xKxFe2As2|
|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.|
|Editor:||Amer Physical Soc|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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