Journal Article

FZJ-2020-05315

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetization Density Distribution of Sr 2 IrO 4 : Deviation from a Local j eff = 1 / 2 Picture

Jeong, J. (Corresponding author) ; Lenz, B. ; Gukasov, A. ; Fabrèges, X. ; Sazonov, A. ; Hutanu, V.RWTH* ; Louat, A. ; Bounoua, D. ; Martins, C. ; Biermann, S. ; Brouet, V. ; Sidis, Y. ; Bourges, P. (Corresponding author)

2020
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/26615  doi:10.1103/PhysRevLett.125.097202

Abstract: 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.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
3. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. POLI: Polarized hot neutron diffractometer (SR9a)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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