Three- to Two-Dimensional Transition of the Electronic Structure in CaFe2As2: A Parent Compound for an Iron Arsenic High-Temperature Superconductor

TitleThree- to Two-Dimensional Transition of the Electronic Structure in CaFe2As2: A Parent Compound for an Iron Arsenic High-Temperature Superconductor
Publication TypeJournal Article
Year of Publication2009
AuthorsLiu C, Kondo T, Ni N, Palczewski AD, Bostwick A, Samolyuk GD, Khasanov R, Shi M, Rotenberg E, Bud'ko SL, Canfield PC, Kaminski A
Journal TitlePhysical Review Letters
Volume102
Pages167004
Date Published04/24
ISBN Number0031-9007
Accession NumberISI:000265479300063
Keywordsgaps
Abstract

We use angle-resolved photoemission spectroscopy (ARPES) to study the electronic properties of CaFe2As2-parent compound of a pnictide superconductor. We find that the structural and magnetic transition is accompanied by a three- to two-dimensional (3D-2D) crossover in the electronic structure. Above the transition temperature (T-s) Fermi surfaces around Gamma and X points are cylindrical and quasi 2D. Below T-s, the Gamma pocket forms a 3D ellipsoid, while the X pocket remains quasi 2D. This finding strongly suggests that low dimensionality plays an important role in understanding the superconducting mechanism in pnictides.

URL<Go to ISI>://000265479300063
DOI10.1103/Physrevlett.102.167004