Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Frustrated Magnets - Strong Spin-Orbit Coupling 1 (joint session TT/MA)

TT 35.10: Vortrag

Mittwoch, 18. März 2020, 12:15–12:30, HSZ 304

Magnetization density distribution of Sr2IrO4: Deviation from a local jeff=1/2 pictureJaehong Jeong1, •Benjamin Lenz2,3, Arsen Gukasov1, Xavier Fabreges1, Andrew Sazonov4, Vladimir Hutanu4, Alex Louat5, Cyril Martins6, Silke Biermann3,7, Veronique Brouet5, Yvan Sidis1, and Philippe Bourges11Laboratoire Léon Brillouin, CEA Saclay, Gif-sur-Yvette, France — 2IMPMC, Sorbonne Université, Paris, France — 3CPHT, Ecole Polytechnique, Palaiseau, France — 4Institute of Crystallography, RWTH Aachen, Germany — 5LPS, Université Paris-Saclay, Orsay, France — 6LCPQ, Université Paul Sabatier, Toulouse, France — 7Collège de France, Paris, France

5d iridium oxides are of huge interest due to the potential for new quantum states driven by strong spin-orbit coupling. The jeff=1/2 state of Sr2IrO4 is such a state and consists of a quantum superposition of the three t2g orbitals with nearly equal population, which stabilizes an unconventional Mott insulating state.
Here, we report an anisotropic and aspherical magnetization density distribution measured by polarized neutron diffraction in a magnetic field up to 5T at 4K, which strongly deviates from a local jeff=1/2 picture. Theoretical considerations based on a momentum-dependent composition of the jeff=1/2 orbital and an estimation of the different contributions to the magnetization density casts the applicability of an effective one-orbital jeff=1/2 Hubbard model into doubt.
The analogy to the superconducting copper oxide systems might thus be weaker than commonly thought.

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