Revelli, A., Sala, M. Moretti, Monaco, G., Magnaterra, M., Attig, J., Peterlini, L., Dey, T., Tsirlin, A. A., Gegenwart, P., Froehlich, T., Braden, M., Grams, C., Hemberger, J., Becker, P., van Loosdrecht, P. H. M., Khomskii, D. I., van den Brink, J., Hermanns, M. and Grueninger, M. (2022). Quasimolecular electronic structure of the spin-liquid candidate Ba3InIr2O9. Phys. Rev. B, 106 (15). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The mixed-valent iridate Ba3InIr2O9 has been discussed as a promising candidate for quantum spin-liquid behavior. The compound exhibits Ir4.5+ ions in face-sharing IrO6 octahedra forming Ir2O9 dimers with three t(2g) holes per dimer. Our results establish Ba3InIr2O9 as a cluster Mott insulator. Strong intradimer hopping delocalizes the three t(2g) holes in quasimolecular dimer states while interdimer charge fluctuations are suppressed by Coulomb repulsion. The magnetism of Ba3InIr2O9 emerges from spin-orbit entangled quasimolecular moments with yet unexplored interactions, opening up a new route to unconventional magnetic properties of 5d compounds. Using single-crystal x-ray diffraction we find the monoclinic space group C2/c already at room temperature. Dielectric spectroscopy shows insulating behavior. Resonant inelastic x-ray scattering reveals a rich excitation spectrum below 1.5 eV with a sinusoidal dynamical structure factor that unambiguously demonstrates the quasimolecular character of the electronic states. Below 0.3 eV, we observe a series of excitations. According to exact diagonalization calculations, such low-energy excitations reflect the proximity of Ba3InIr2O9 to a hopping-induced phase transition based on the condensation of a quasimolecular spin-orbit exciton. The dimer ground state roughly hosts two holes in a bonding j = 1/2 orbital and the third hole in a bonding j = 3/2 orbital.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Revelli, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sala, M. MorettiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Monaco, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Magnaterra, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Attig, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peterlini, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dey, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tsirlin, A. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gegenwart, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Froehlich, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Braden, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grams, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hemberger, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Becker, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Loosdrecht, P. H. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Khomskii, D. I.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van den Brink, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hermanns, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grueninger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-692672
DOI: 10.1103/PhysRevB.106.155107
Journal or Publication Title: Phys. Rev. B
Volume: 106
Number: 15
Date: 2022
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SCATTERING; PHYSICS; MODELMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69267

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