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Condensed Matter Seminar: "Quantum Magnetism in LiZn2Mo3O8"

SpeakerAsst. Professor Tyrel McQueen, Johns Hopkins University
Date Oct 11, 2013
Time 1:00 pm  
Location 190 Engineering Sciences Bldg - corner Goodwin & Springfield 
Sponsor Physics
Contact Jason Maldonado
Phone 217.300.6431
Event type Seminar/Symposium
Views 6438

Numerous materials possess a geometrically frustrated arrangement of magnetic atoms; such materials have magnetic moments arranged on frustrated topologies such as triangular lattices, kagomé lattices, hyper-kagomé lattices, and edge sharing tetrahedra. A rich diversity of properties result depending on the magnitude of the per-site spin and orbital occupancies. Yet, the presence of local structural distortions [1], and a degree of site mixing between non-magnetic and magnetic layers are still key limiters in the quest for new quantum states of matter [2]. In this talk, I will present recent physical property measurements on LiZn2Mo3O8, a material in which small clusters of 4d metal atoms replace individual magnetic ions, greatly limiting the degree of site mixing and suppressing first order Jahn-Teller distortions [3]. In particular, 7Li NMR, µSR, ESR, [4] and inelastic neutron scattering experiments [5] are all consistent with the existence of valence bond pairs in LiZn2Mo3O8, with a spatial extent extending beyond nearest neighbors. Progress toward identifying their dynamic or static nature will be discussed.


[1] See, e.g., K. Pene, N. Shannon, and H. Shiba, Phys. Rev. Lett. 93, 197203 (2004).

[2] See, e.g., D.E. Freedman, et al., J. Am. Chem. Soc. 132, 16185-16190 (2010).

[3] J.P. Sheckelton, et al., Nat. Mater. 11, 493-496 (2012).

[4] J.P. Sheckelton, et al., Submitted (2013).

[5] M. Mourigal, et al., Submitted (2013).

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