Home > Publications database > Non-Fermi-liquid to Fermi-liquid transports in iron-pnictide Ba(Fe 1− x Co x ) 2 As 2 and the electronic correlation strength in superconductors newly probed by the normal-state Hall angle |
Journal Article | FZJ-2018-01472 |
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2017
Dt. Physikalische Ges.
[Bad Honnef]
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Please use a persistent id in citations: http://hdl.handle.net/2128/17495 doi:10.1088/1367-2630/aa649e
Abstract: Electrical transports in iron-pnictide Ba(Fe1−x Co x )2As2 (BFCA) single crystals are heavily debated in terms of the hidden Fermi-liquid (HFL) and holographic theories. Both HFL and holographic theories provide consistent physic pictures and propose a universal expression of resistivity to describe the crossover of transports from the non-Fermi-liquid (FL) to FL behavior in these so-called 'strange metal' systems. The deduced spin exchange energy J and model-dependent energy scale W in BFCA are almost the same, or are of the same order of several hundred Kelvin for over-doped BFCA, which is in agreement with the HFL theory. Moreover, a drawn line of W/3.5 for BFCA in the higher-doping region up to the right demonstrates the crossover from non-FL-like behavior to FL-like behavior at high doping, and shows a new phase diagram of BFCA. The electronic correlation strength in superconductors has been newly probed by the normal-state Hall angle, which found that, for the first time, correlation strength can be characterized by the ratios of T c to the Fermi temperature T F, J/T F, and the transverse mass to longitudinal mass.
Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)
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