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Short-Range Correlations in the Magnetic Ground State of Na4Ir3O8



Rebecca Dally, Tom Hogan, Alex Amato, Chris Baines, Jose Rodriguez Rivera, Michael J. Graf, Stephen D. Wilson


The magnetic ground state of the Jeff = 1/2 hyper-Kagome lattice in Na4Ir3O8 is explored via combined bulk magnetization, muon spin relaxation, and neutron scattering measurements. A short-range, frozen, state comprised of quasi-static moments develops below a characteristic temperature of ΤF=6 K, revealing an inhomogeneous distribution of spins occupying the entirety of the sample volume. Quasi-static, short-range, spin correlations persist until at least 20 mK and differ substantially from the nominally dynamic response of a quantum spin liquid, instead freezing into fragmented order with a response resembling that of frustrated spin-ice. Our data demonstrate that an inhomogeneous magnetic ground state arises in Na4Ir3O8 driven either by disorder inherent to the creation of the hyper-Kagome lattice itself or stabilized via quantum fluctuations.
Physical Review Letters


Neutron Scattering, Magnetic Materials


Dally, R. , Hogan, T. , Amato, A. , Baines, C. , Rodriguez Rivera, J. , Graf, M. and Wilson, S. (2014), Short-Range Correlations in the Magnetic Ground State of Na<sub>4</sub>Ir<sub>3</sub>O<sub>8</sub>, Physical Review Letters, [online], (Accessed June 16, 2024)


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Created December 11, 2014, Updated October 12, 2021