Journal Article

FZJ-2018-01472

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png 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

Wang, L. M. (Corresponding author) ; Wang, C.-Y. ; Zen, S.-M. ; Chang, J.-Y. ; Kuo, C. N. ; Lue, C. S. ; Chang, L. J. ; Su, Y.FZJ* ; Wolf, T. ; Adelmann, P.

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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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Streumethoden (JCNS-2)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2018

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Database coverage:
; ; ; ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; IF < 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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