Unusual Temperature Dependence of Band Dispersion in Ba(Fe1-xRux)(2)As-2 and its Consequences for Antiferromagnetic Ordering

TitleUnusual Temperature Dependence of Band Dispersion in Ba(Fe1-xRux)(2)As-2 and its Consequences for Antiferromagnetic Ordering
Publication TypeJournal Article
Year of Publication2013
AuthorsDhaka RS, Hahn SE, Razzoli E, Jiang R, Shi M, Harmon BN, Thaler A, Bud'ko SL, Canfield PC, Kaminski A
Journal TitlePhysical Review Letters
Volume110
Pages067002
Date Published02
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberWOS:000314687700009
Keywords43 k, augmented-wave method, bafe2as2, superconductivity, transition
Abstract

We have performed detailed studies of the temperature evolution of the electronic structure in Ba(Fe1-xRux)(2)As-2 using angle resolved photoemission spectroscopy. Surprisingly, we find that the binding energy of both hole and electron bands changes significantly with temperature in both pure and Ru substituted samples. The hole and electron pockets are well nested at low temperature in unsubstituted (BaFe2As2) samples, which likely drives the spin density wave and resulting antiferromagnetic order. Upon warming, this nesting is degraded as the hole pocket shrinks and the electron pocket expands. Our results demonstrate that the temperature dependent nesting may play an important role in driving the antiferromagnetic-paramagnetic phase transition. DOI: 10.1103/PhysRevLett.110.067002

URL<Go to ISI>://WOS:000314687700009
DOI10.1103/PhysRevLett.110.067002