We have studied the three-dimensional shapes of the Fermi surfaces (FSs) of BaFe2(As1-xPx)2 (x=0.38), where superconductivity is induced by isovalent P substitution, by angle-resolved photoemission spectroscopy. Moderately strong electron mass enhancement has been identified for both the electron and hole FSs. Among two observed hole FSs, the nearly two-dimensional one shows good nesting with the outer two-dimensional electron FS, but its orbital character is different from the outer electron FS. The three-dimensional hole FS shows poor nesting with the electron FSs. The present results suggest that the three-dimensionality and the difference in the orbital character weaken FS nesting, leaving partial nesting among the outer electron FSs of dxy character and/or that within the three-dimensional hole FS, which may lead to the nodal superconductivity.
@article{arxiv.1008.2080,
title = {Two- and Three-Dimensional Fermi Surfaces and their Nesting Properties in Superconducting BaFe2(As1-xPx)2},
author = {T. Yoshida and I. Nishi and S. Ideta and A. Fujimori and M. Kubota and K. Ono and S. Kasahara and T. Shibauchi and T. Terashima and Y. Matsuda and H. Ikeda and R. Arita},
journal= {arXiv preprint arXiv:1008.2080},
year = {2012}
}