Short-Range Correlations in the Magnetic Ground State of Na4Ir3O8

Published

December 12, 2014

Author(s)

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

Abstract

The magnetic ground state of the J_eff = 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 Τ_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 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.

Citation

Physical Review Letters

Volume

113

Issue

24

Pub Type

Journals

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Keywords

Neutron Scattering, Magnetic Materials

Citation

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 Na₄Ir₃O₈, Physical Review Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=917213 (Accessed July 17, 2024)