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Non-Fermi-liquid to Fermi-liquid transports in iron-pnictide Ba(Fe₁₋ₓCoₓ)₂As₂ and the electronic correlation strength in superconductors newly probed by the normal-state Hall angle

Wang, L M; Wang, Chih-Yi; Zen, Sha-Min; Chang, Jin-Yuan; Kuo, C N; Lue, C S; Chang, L J; Su, Y; Wolf, Th; Adelmann, P

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.


Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1088/1367-2630/aa649e
ISSN: 1367-2630
KITopen ID: 1000068804
HGF-Programm 43.21.01; LK 01
Erschienen in New journal of physics
Band 19
Heft 3
Seiten 033039
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