T
T. Kawahara
Researcher at Tohoku University
Publications - 7
Citations - 619
T. Kawahara is an academic researcher from Tohoku University. The author has contributed to research in topics: Wave vector & Fermi surface. The author has an hindex of 6, co-authored 7 publications receiving 591 citations.
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Journal ArticleDOI
Fermi surface nesting induced strong pairing in iron-based superconductors.
K. Terashima,Y. Sekiba,J. H. Bowen,Kosuke Nakayama,T. Kawahara,Takafumi Sato,Pierre Richard,Yiming Xu,Lingli Li,Guanghan Cao,Zhu-An Xu,Hong Ding,Takashi Takahashi +12 more
TL;DR: The strong pairing strength is found to switch to the nested β FS, indicating an intimate connection between FS nesting and superconducting pairing, and strongly supporting the inter-FS pairing mechanism in the iron-based superconductors.
Journal ArticleDOI
Angle-resolved photoemission spectroscopy of the iron-chalcogenide superconductor Fe1.03Te0.7Se0.3: strong coupling behavior and the universality of interband scattering.
Kosuke Nakayama,Takafumi Sato,Pierre Richard,T. Kawahara,Y. Sekiba,Tian Qian,Tian Qian,G. F. Chen,J. L. Luo,Nanlin Wang,Hong Ding,Takashi Takahashi +11 more
TL;DR: The observed similarity of low-energy electronic excitations between iron-chalcogenides and iron-arsenides strongly suggests that common interactions which involve Q∼(π,π) scattering are responsible for the SC pairing.
Journal ArticleDOI
Universality of superconducting gaps in overdoped Ba 0.3 K 0.7 Fe 2 As 2 observed by angle-resolved photoemission spectroscopy
Kosuke Nakayama,Takafumi Sato,Pierre Richard,Pierre Richard,Yiming Xu,T. Kawahara,K. Umezawa,Tian Qian,Madhab Neupane,Genfu Chen,Hong Ding,Takashi Takahashi +11 more
TL;DR: In this article, angle-resolved photoemission spectroscopy was performed on the superconducting (SC) gap on each Fermi surface (FS) and the gap values varied from 4.4 to 7.9 meV on different FSs.
Journal ArticleDOI
Fermi surface dichotomy of the superconducting gap and pseudogap in underdoped pnictides
Yiming Xu,Yiming Xu,Pierre Richard,Pierre Richard,Kosuke Nakayama,T. Kawahara,Y. Sekiba,Tianmei Qian,Tianmei Qian,Madhab Neupane,Seigo Souma,Takafumi Sato,Takashi Takahashi,Huiqian Luo,Hai-Hu Wen,Genfu Chen,Genfu Chen,Nanlin Wang,Zhiwei Wang,Zhen Fang,Xingchao Dai,Hong Ding +21 more
TL;DR: In this article, the superconducting gap of underdoped pnictides scales linearly with the transition temperature, and a distinct pseudogap coexisting with the supercondensing gap develops on underdoping.
Journal ArticleDOI
Unconventional superconducting gap in NaFe 0 . 95 Co 0 . 05 As observed by angle-resolved photoemission spectroscopy
Zhonghao Liu,Pierre Richard,Pierre Richard,Kosuke Nakayama,Genfu Chen,S. Dong,J. He,D. M. Wang,Tian-Long Xia,K. Umezawa,T. Kawahara,Seigo Souma,Takafumi Sato,Takashi Takahashi,Tianmei Qian,Yaobo Huang,Nan Xu,Y.-B. Shi,Hong Ding,Shancai Wang +19 more
TL;DR: In this article, angle-resolved photo-emission measurements on superconducting electron-doped NaFe0.95Co0.05As (T-c similar to 18 K) were performed.