Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q51: Quantum Spin Liquid III
3:00 PM–5:48 PM,
Wednesday, March 16, 2022
Room: McCormick Place W-474B
Sponsoring
Units:
GMAG DCMP
Chair: Shangshun Zhang, University of Minnesota
Abstract: Q51.00011 : Magnetic correlations in the semimetallic hyperkagome iridate Na3Ir3O8: a rare case of doping in a quantum spin liquid*
5:24 PM–5:36 PM
Presenter:
Philippe Mendels
(Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France)
Authors:
Philippe Mendels
(Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France)
Gediminas Simutis
(Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France)
Tomohiro Takayama
(Max Planck Institute for Solid State Physics)
Quentin Barthélemy
(Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France)
Fabrice Bert
(Laboratoire de Physique des Solides, Paris-Saclay University and CNRS, France)
HIDENORI TAKAGI
(Max Planck Institute for Solid State Physics)
Na3Ir3O8 has a different crystal structure, but the underlying hyperkagome arrangement of iridium ions is preserved. Moreover, the iridium valence in this system is 4.33+ and not 4+ like in the parent compound. Therefore, it can be seen as a 1/3 hole doped hyper-kagome spin system, a rare example of efficient doping achieved in a quantum spin liquid, following P.W. Anderson's seminal idea. Due to a complex interplay between inter-site hopping, Coulomb repulsion, crystal field splitting and spin-orbit coupling, it is a semi-metal.
We present a microscopic 23Na NMR study of the Na3Ir3O8 compound. The uniform q = 0 susceptibility is determined via shift measurements and the dynamical response by probing the spin-lattice relaxation rate. The susceptibility is consistent with a semimetal behavior, though with electronic bands substantially modified by correlations. Remarkably, the antiferromagnetic fluctuations present in the insulating parent compound Na4Ir3O8 survive in the studied compound. The spin dynamics are consistent with 120° excitations modes displaying short-range correlations.
*This project is supported by Agence Nationale de la recherche: SOCRATE (ANR-15-CE30-0009-01), LINK (ANR-18-CE30-0022).Gediminas Simutis was funded by the Swiss National Science Foundation Mobility Grant No. P2EZP2-178604 and PALM LabEx Grant No.ANR-10-LABX-0039-PALM.
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