MRS Meetings and Events


QT06.07.02 2024 MRS Spring Meeting

Multipolar Ordering in CaIrO3 Thin Films

When and Where

Apr 24, 2024
3:45pm - 4:15pm

Room 447, Level 4, Summit



Regina Dittmann1,Marjana Lezaic2,Alexandros Sarantopoulos1,David Gustin2

PGI-71,Forschungszentrum Jülich GmbH2


Regina Dittmann1,Marjana Lezaic2,Alexandros Sarantopoulos1,David Gustin2

PGI-71,Forschungszentrum Jülich GmbH2
5<i>d</i>-transition metal oxides, where correlations and spin-orbit coupling play at the same energy scale, create a great playground in search for high-T<sub>C</sub> and unconventional superconductivity, spin liquids and novel magnetic ordering phenomena.<br/>The metastable perovskite phase of CaIrO<sub>3</sub> was previously grown in thin-film form and characterized as semimetallic by <i>ab-initio</i> calculations (Yang et al., J. Phys. Condens. Matter (2010) ), although the optical conductivity spectra were inconclusive in this respect, leaving open the possibility of a small-gap insulating state. We performed first-principles calculations which yield a small insulating gap, despite a large spatial extent of Ir 5<i>d </i>wavefunctions. Ordering of higher-order magnetic multipoles is shown to go hand-in-hand with the gap formation.<br/>In order to verify our calculations we have grown CaIrO<sub>3</sub> thin films on SrTiO<sub>3</sub> by pulsed laser deposition. Due to the high volatility of IrO<sub>3</sub> significant off-stoichiometry is observed despite a high crystalline quality and the formation of a stable perovskite structure. In order to obtain stoichiometric CaIrO<sub>3</sub> thin films, we had to adjust the growth kinetics while reducing the oxygen partial pressure to prevent the formation of volatile IrO<sub>3</sub>. We will discuss the electrical and magnetic properties of our films in the framework of the presence of multipolar ordering, gap formation and possible structural defects.


magnetic properties

Symposium Organizers

Lucas Caretta, Brown University
Yu-Tsun Shao, University of Southern California
Sandhya Susarla, Arizona State University
Y. Eren Suyolcu, Max Planck Institute

Publishing Alliance

MRS publishes with Springer Nature