Short-Range Correlations in the Magnetic Ground State ofNa4Ir3O8

Rebecca Dally, Tom Hogan, Alex Amato, Hubertus Luetkens, Chris Baines, Jose Rodriguez-Rivera, Michael J. Graf, Stephen D. Wilson
2014 Physical Review Letters  
The magnetic ground state of the 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 T_F=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
more » ... y from the nominally dynamic response of a quantum spin liquid. 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.
doi:10.1103/physrevlett.113.247601 pmid:25541804 fatcat:yoinwxuw3jefxkbdbn5yav7x3q