Two- and Three-Dimensional Fermi Surfaces and their Nesting Properties in Superconducting BaFe2(As1-xPx)2

TL;DR

This study uses angle-resolved photoemission spectroscopy to analyze the three-dimensional Fermi surfaces of BaFe2(As1-xPx)2, revealing how their shapes and orbital characters influence nesting properties and potentially affect superconductivity.

Contribution

It provides detailed three-dimensional Fermi surface mappings and insights into nesting properties in BaFe2(As1-xPx)2, highlighting the effects of three-dimensionality and orbital differences on superconductivity.

Findings

Moderately strong electron mass enhancement observed.

Good nesting found between certain hole and electron Fermi surfaces.

Three-dimensionality and orbital differences weaken Fermi surface nesting.

Abstract

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.