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Dresden 2014 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Focus Session: Dynamics, Topology, and Fractionalisation

TT 16.4: Hauptvortrag

Montag, 31. März 2014, 16:45–17:15, HSZ 01

Molecular Quantum Magnetism in LiZn2Mo3O8 — •Collin Broholm — Johns Hopkins University, Baltimore, USA

I shall discuss the unusual quantum magnetism of LiZn2Mo3O8 where Mo3O13 molecules realize spin-1/2 degrees of freedom on a triangular lattice and the spin system remains in a quantum fluctuating state deep into the low temperature regime [1]. Neutron scattering experiments on a powder sample show apparently gapless (Δ <0.2 meV) magnetic excitations extending at least to 2.5 meV [2]. The data are consistent with a disordered valence bond solid or a resonating valence bond state involving nearest-neighbor and next-nearest-neighbor spins.
J. P. Sheckelton, J. R. Neilson, D. G. Soltan, and T. M. McQueen, Nature Mater. 11, 493496 (2012)
M. Mourigal, W. T. Fuhrman, J. P. Sheckelton, A. Wartelle, J. A. Rodriguez-Rivera, T. M. McQueen, C. L. Broholm, arXiv:1309.1165 (2013).

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