title: Strong spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4.
abstract: We present a first-principles study of spin-orbit coupling effects on the Fermi surface of Sr2RuO4 and Sr2RhO4. For nearly degenerate bands, spin-orbit coupling leads to a dramatic change of the Fermi surface with respect to nonrelativistic calculations; as evidenced by the comparison with experiments on Sr2RhO4, it cannot be disregarded. For Sr2RuO4, the Fermi surface modifications are more subtle but equally dramatic in the detail: Spin-orbit coupling induces a strong momentum dependence, normal to the RuO2 planes, for both orbital and spin character of the low-energy electronic states. These findings have profound implications for the understanding of unconventional superconductivity in Sr2RuO4.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany.
authors.forename: M W
authors.initials: MW
authors.lastname: Haverkort
authors.forename: I S
authors.initials: IS
authors.lastname: Elfimov
authors.forename: L H
authors.initials: LH
authors.lastname: Tjeng
authors.forename: G A
authors.initials: GA
authors.lastname: Sawatzky
authors.forename: A
authors.initials: A
authors.lastname: Damascelli