TY  - JOUR
AU  - Jeong, Jaehong
AU  - Lenz, Benjamin
AU  - Gukasov, Arsen
AU  - Fabrèges, Xavier
AU  - Sazonov, Andrew
AU  - Hutanu, Vladimir
AU  - Louat, Alex
AU  - Bounoua, Dalila
AU  - Martins, Cyril
AU  - Biermann, Silke
AU  - Brouet, Véronique
AU  - Sidis, Yvan
AU  - Bourges, Philippe
TI  - Magnetization Density Distribution of Sr 2 IrO 4 : Deviation from a Local j eff = 1 / 2 Picture
JO  - Physical review letters
VL  - 125
IS  - 9
SN  - 1079-7114
CY  - College Park, Md.
PB  - APS
M1  - FZJ-2020-05315
SP  - 097202
PY  - 2020
AB  - 5d iridium oxides are of huge interest due to the potential for new quantum states driven by strong spin-orbit coupling. The strontium iridate Sr2IrO4is particularly in the spotlight because of the so-called jeff=1/2 state consisting of a quantum superposition of the three local t2g orbitals with, in its simplest version, nearly equal populations, which stabilizes an unconventional Mott insulating state. Here, we reportan anisotropic and aspherical magnetization density distribution measured by polarized neutron diffractionin a magnetic field up to 5 T at 4 K, which strongly deviates from a local jeff=1/2 picture even when distortion-induced deviations from the equal weights of the orbital populations are taken into account. Once reconstructed by the maximum entropy method and multipole expansion model refinement, the magnetization density shows four cross-shaped positive lobes along the crystallographic tetragonal axes with a large spatial extent, showing that the xy-orbital contribution is dominant.The analogy to the superconducting copper oxide systems might then be weaker than commonly thought.
LB  - PUB:(DE-HGF)16
C6  - 32915616
UR  - <Go to ISI:>//WOS:000562322000007
DO  - DOI:10.1103/PhysRevLett.125.097202
UR  - https://juser.fz-juelich.de/record/888910
ER  -