C. Utfeld

Spin and orbital Ti magnetism at LaMnO3/SrTiO3 interfaces

In systems with strong electron-lattice coupling, such as manganites, orbital degeneracy is lifted, causing a null expectation value of the orbital magnetic moment. Magnetic structure is thus determined by spin-spin superexchange. In titanates, however, with much smaller Jahn-Teller distortions, orbital degeneracy might allow non-zero values of the orbital magnetic moment, and novel forms of ferromagnetic superexchange interaction unique to t(2g) electron systems have been theoretically predicted, although their experimental observation has remained elusive. In this paper, we report a new kind of Ti(3+) ferromagnetism at LaMnO(3)/SrTiO(3) epitaxial interfaces. It results from charge transfer to the empty conduction band of the titanate and has spin and orbital contributions evidencing the role of orbital degeneracy. The possibility of tuning magnetic alignment (ferromagnetic or antiferromagnetic) of Ti and Mn moments by structural parameters is demonstrated. This result will provide important clues for understanding the effects of orbital degeneracy in superexchange coupling.

Electronic structure of RNiC2 (R=Sm, Gd, and Nd) intermetallic compounds

First-principles calculations of the electronic structure of members of the

Bulk electronic structure of optimally doped Ba(Fe1-xCox)2As2

R

Measurement of Magnetic Exchange in Ferromagnet-Superconductor La2/3Ca1/3MnO3/YBa2Cu3O7 Bilayers

NiC

Bulk spin polarization of Co(1-x)FexS2

_2

Fermi surfaces of rare-earth nickel borocarbides

series are presented, and their Fermi surfaces investigated for nesting propensities which might be linked to the charge-density waves exhibited by certain members of the series (

The Bristol HIDAC 2D-ACAR Spectrometer

R

Bulk Spin Polarization of Co1-xFexS2

= Sm, Gd and Nd). Calculations of the generalized susceptibility,

Bulk Spin Polarization ofCo(1−x)FexS2

\chi_{0}({\bf q},\omega)

Bulk Spin Polarization of Co

, show strong peaks at the same