Strong electronic correlations in transition-metal-oxides give rise to many exciting phenomena such as unconventional superconductivity, multiferroic states or competing interactions. In this section we report how the electronic and magnetic properties can be tailored by the crystal growth and how the new properties can be observed as well as theoretically understood. In particular, we investigate the complex iridium oxide Na
3Ir
3O
8 with a chiral hyper-kagome lattice, the inverse-perovskites M
3TrO (Tr = tetrel element: Si, Ge, Sn, Pb), and also iron-based superconductors such as Fe
2Se
2. From the spectroscopic side, we employ inelastic neutron scattering, spin-polarized scanning tunneling microscopy, and magnetization measurements. Finally, we analyze the resulting electronic correlations theoretically, in particular, their non-Fermi-liquid behavior, the origin of quantum interference and provide insights to a Mott-insulating state by a many-electron wavefunction.
Semi-metallic ground state of hyper-kagome iridate Na3Ir3O8 produced by a competion of molecular orbital split and spin-orbit coupling
T. Takayama, A. Yaresko, A. Matsumoto, J. Nuss, and H. Takagi
Tilted inverse-perovskites, new class of three-dimensional Dirac electron systems
J. Nuss, A. W. Rost, C. Mühle, K. Hayama, V. Abdolazimi, and H. Takagi
Effect of Te doping on the structure and superconductivity of K0.8Fe2Se2-zTez single crystals
M. T. Li, W.P. Liu, and C. T. Lin
Electronic ordering in perovskites and the effects on the symmetry of crystal structures
M. Etter, M. Isobe, H. Sakurai, R. E. Dinnebier, and H. Takagi
Competing exchange interactions on the verge of a metal-insulator transition in the two-dimensional spiral magnet Sr3Fe2O7
J.-H. Kim, A. Jain, G. Khaliullin, D. C. Peets, C. Ulrich, A. C. Walters, D. S. Inosov, A. Maljuk, and B. Keimer
Atomic-scale imaging of magnetic order in strongly correlated electron systems
R. Aluru, M. Enayat, Z. Sun, U. R. Singh, S. Schmaus, A. Yaresko, Y. Liu, C. T. Lin, and P. Wahl
Polar instability through strong magneto-elastic coupling in bulk EuTiO3: Small cause, large impact
P. G. Reuvekamp, K. Caslin, R. K. Kremer, J. Köhler, and A. Bussmann-Holder
Non-Fermi liquid behavior in two-dimensional metals at the onset of incommensurate density wave order
T. Holder and W. Metzner
Interference effects in two-dimensional chiral metal with vacancies
P. M. Ostrovsky
Insight into the many-electron wavefunction of Mott-insulating antiferromagnets
L. R. Schwarz and A. Alavi