Highly mobile carriers in orthorhombic phases of iron-based superconductors FeSe${}_{1-x}$S${}_x$

Abstract

The field and temperature dependencies of the longitudinal and Hall resistivity have been measured for FeSe${}_{1-x}$S${}_x$ (x=0.04, 0.09 and 0.19) single crystals. The sample FeSe${}_{0.81}$S${}_{0.19}$ does not show a transition to an orthorhombic phase and exhibits at low temperatures the transport properties quite different from those of orthorhombic samples. The behavior of FeSe${}_{0.81}$S${}_{0.19}$ is well described by the simple two band model with comparable values of hole and electron mobility. In particular, at low temperatures the transverse resistance shows a linear field dependence, the magnetoresistance follow a quadratic field dependence and obeys to Kohler's rule. In contrast, Kohler's rule is strongly violated for samples having an orthorhombic low temperature structure. However, the transport properties of the orthorhombic samples can be satisfactory described by the three band model with the pair of almost equivalent to the tetragonal sample hole and electron bands, supplemented with the highly mobile electron band which has two order smaller carrier number. Therefore, the peculiarity of the low temperature transport properties of the orthorhombic Fe(SeS) samples, as probably of many other orthorhombic iron superconductors, is due to the presence of a small number of highly mobile carriers which originate from the local regions of the Fermi surface, presumably, nearby the Van Hove singularity points.

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Cited by in corpus (13)

• Nematicity, magnetism and superconductivity in FeSe
• The key ingredients of the electronic structure of FeSe
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Evolution of the Fermi surface of the nematic superconductors FeSe1-xSx
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Growth of superconducting epitaxial films of sulfur substituted FeSe via pulsed laser deposition
• Close correlation between superconducting transition temperatures and carrier densities in Te- and S-substituted FeSe thin films
• Bulk and surface Dirac states accompanied by two superconducting domes in FeSe-based superconductors
• Charge carrier dynamics of FeSe thin film investigated by terahertz magneto-optical spectroscopy
• Nematic properties of FeSe${}_{1-x}$Te${}_x$ crystals with a low Te content
• Magnetotransport properties of FeSe in fields up to 50T
• Majority carrier type inversion in FeSe family and "doped semimetal" scheme in iron-based superconductors
• Phase separation near the charge neutrality point in FeSe${}_{1-x}$Te${}_x$ crystals with x $<$ 0.15