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Thermodynamic Study of Nodal Structure and Multiband Superconductivity of KFe2As2
Shunichiro Kittaka, Yuya Aoki, Naoki Kase +12
The temperature, field, and field-orientation dependences of the electronic specific heat Ce of the ironpnictide superconductor KFe2As2 have been investigated. Thermodynamic eviden…
Normal-state charge dynamics in doped BaFe2As2: Roles of doping and necessary ingredients for superconductivity
M. Nakajima, S. Ishida, T. Tanaka +11
We carried out a comparative study of the in-plane resistivity and optical spectrum of doped BaFe2As2 and investigated the doping evolution of the charge dynamics. For BaFe2As2, ch…
Strong electronic correlations in iron pnictides: Comparison of the optical spectra for BaFe2As2-related compounds
M. Nakajima, S. Ishida, T. Tanaka +11
We carried out combined transport and optical measurements for BaFe2As2 and five isostructural transition-metal (TM) pnictides. The low-energy optical conductivity spectra of these…
Superconducting gap with sign reversal between hole pockets in heavily hole-doped Ba1-xKxFe2As2
D. Watanabe, T. Yamashita, Y. Kawamoto +16
To gain insight into the unconventional superconductivity of Fe-pnictides with no electron pockets, we measure the thermal conductivity and penetration depth in the heavily…
Evidence for exclusion of the possibility of -wave superconducting-gap symmetry in Ba-doped KFeAs
Y. Ota, K. Okazaki, Y. Kotani +12
We have investigated the superconducting(SC)-gap anisotropy for several Ba-doped KFeAs samples using laser-based angle-resolved photoemission spectroscopy. We show that the…
Fermi surface in KFe2As2 determined via de Haas-van Alphen oscillation measurements
Taichi Terashima, Nobuyuki Kurita, Motoi Kimata +14
We have completely determined the Fermi surface in KFeAs via de Haas-van Alphen (dHvA) measurements. Fundamental frequencies , , , and are observed in KFeA…