RIXS interferometry and the role of disorder in the quantum magnet Ba3 Ti3-x Irx O9

@ARTICLE{Magnaterra2023,
	author = {Magnaterra, M. and Moretti Sala, M. and Monaco, G. and Becker, P. and Hermanns, M. and Warzanowski, P. and Lorenz, T. and Khomskii, D.I. and Van Loosdrecht, P.H.M. and Van Den Brink, J. and Grüninger, M.},
	title = {RIXS interferometry and the role of disorder in the quantum magnet Ba3 Ti3-x Irx O9},
	year = {2023},
	journal = {Physical Review Research},
	volume = {5},
	number = {1},
	doi = {10.1103/PhysRevResearch.5.013167},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85151382686&doi=10.1103%2fPhysRevResearch.5.013167&partnerID=40&md5=fc3c9f2ca07b6bb6f27c6c0fb0dd29a2},
	abstract = {Motivated by several claims of spin-orbit-driven spin-liquid physics in hexagonal Ba3Ti3-xIrxO9 hosting Ir2O9 dimers, we report on resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge for different x. We demonstrate that magnetism in Ba3Ti3-xIrxO9 is governed by an unconventional realization of strong disorder, where cation disorder affects the character of the local moments. RIXS interferometry, studying the RIXS intensity over a broad range of transferred momentum q, is ideally suited to assign different excitations to different Ir sites. We find pronounced Ir-Ti site mixing. Both ions are distributed over two crystallographically inequivalent sites, giving rise to a coexistence of quasimolecular singlet states on Ir2O9 dimers and spin-orbit-entangled j=1/2 moments of 5d5Ir4+ ions. RIXS reveals different kinds of strong magnetic couplings for different bonding geometries, highlighting the role of cation disorder for the suppression of long-range magnetic order in this family of compounds.  © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.},
	keywords = {Binary alloys; Magnetic couplings; Positive ions; Quantum entanglement; X ray scattering; Cation disorder; Local moments; Quantum magnets; Resonant inelastic x-ray scattering; Singlet state; Spin liquids; Spin orbits; Strong disorders; Transferred momentum; X-ray scattering intensity; Interferometry},
	type = {Article},
	publication_stage = {Final},
	source = {Scopus},
	note = {Cited by: 0; All Open Access, Gold Open Access, Green Open Access}
}