title: Mechanisms of enhanced orbital dia- and paramagnetism: application to the Rashba semiconductor BiTeI.
abstract: We study the magnetic susceptibility of a layered semiconductor BiTeI with giant Rashba spin splitting both theoretically and experimentally to explore its orbital magnetism. Apart from the core contributions, a large temperature-dependent diamagnetic susceptibility is observed when the Fermi energy E(F) is near the crossing point of the Rashba spin-split conduction bands at the time-reversal symmetry point A. On the other hand, when E(F) is below this band crossing, the susceptibility turns to be paramagnetic. These features are consistent with first-principles calculations, which also predict an enhanced orbital magnetic susceptibility with both positive and negative signs as a function of E(F) due to band (anti)crossings. Based on these observations, we propose two mechanisms for the enhanced paramagnetic orbital susceptibility.
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo 113-8656, Japan. g.schober@thphys.uni-heidelberg.de
authors.forename: G A H
authors.initials: GA
authors.lastname: Schober
authors.forename: H
authors.initials: H
authors.lastname: Murakawa
authors.forename: M S
authors.initials: MS
authors.lastname: Bahramy
authors.forename: R
authors.initials: R
authors.lastname: Arita
authors.forename: Y
authors.initials: Y
authors.lastname: Kaneko
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura
authors.forename: N
authors.initials: N
authors.lastname: Nagaosa