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Title: Systematics of the temperature-dependent interplane resistivity in Ba(Fe 1-xM x)₂As₂ (M=Co, Rh, Ni, and Pd)

Temperature-dependent interplane resistivity ρ c(T) was measured systematically as a function of transition-metal substitution in the iron-arsenide superconductors Ba(Fe 1-xM x)₂As₂, M=Ni, Pd, Rh. The data are compared with the behavior found in Ba(Fe 1-xCo x)₂As₂, revealing resistive signatures of pseudogap. In all compounds we find resistivity crossover at a characteristic pseudogap temperature T* from nonmetallic to metallic temperature dependence on cooling. Suppression of T* proceeds very similarly in cases of Ni and Pd doping and much faster than in similar cases of Co and Rh doping. In cases of Co and Rh doping an additional minimum in the temperature-dependent ρ c emerges for high dopings, when superconductivity is completely suppressed. These features are consistent with the existence of a charge gap covering part of the Fermi surface. The part of the Fermi surface affected by this gap is notably larger for Ni- and Pd-doped compositions than in Co- and Rh-doped compounds.
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Publication Date:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 84; Journal Issue: 1; Related Information: CHORUS Timestamp: 2017-04-06 04:44:13; Journal ID: ISSN 1098-0121
American Physical Society
Sponsoring Org:
Country of Publication:
United States
OSTI Identifier: