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Spin liquid state in the S = 1/2 triangular lattice Ba 3 CuSb 2 O 9

Spin liquid state in the S = 1/2 triangular lattice Ba 3 CuSb 2 O 9. H. D. Zhou 1 , E. S. Choi 1 , G. Li 1 , L. Balicas 1 , C. R. Wiebe 2 , Y. Qiu 3,4 , J. R. D. Copley , 3 and J. S. Gardner 3,5 1 NHMFL/FSU, 2 U. Winnipeg, 3 NCNR, 4 U. Maryland, 5 Indiana U. DMR-0944772 DMR-0654118.

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Spin liquid state in the S = 1/2 triangular lattice Ba 3 CuSb 2 O 9

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  1. Spin liquid state in the S = 1/2 triangular lattice Ba3CuSb2O9 H. D. Zhou1, E. S. Choi1, G. Li1, L. Balicas1, C. R. Wiebe2, Y.Qiu3,4, J. R. D. Copley,3and J. S. Gardner3,5 1NHMFL/FSU, 2U. Winnipeg, 3NCNR, 4U. Maryland, 5Indiana U. DMR-0944772 DMR-0654118 Dan Neumann, National Institute of Standards and Technology, DMR 0944772 (a) Schematic crystal structure for Ba3CuSb2O9; (b) The layer structure along the c-axis; (c) The triangular lattice of Cu2+ ions in the ab plane. One of the current thrusts of modern condensed matter science has been the realization of an important model compound known as the quantum spin liquid (QSL). We unveil a new candidate spin liquid compound, Ba3CuSb2O9, in which the Cu2+ ions form a geometrically frustrated triangular lattice. The magnetic susceptibility and neutron scattering experiments on this material (using the CHRNS Disk Chopper Spectrometer) show no magnetic ordering down to 0.2 K despite moderately strong anti-ferromagnetic interactions with J ~ 32 K. The magnetic specific heat reveals a T-linear dependence with  = 43.4mJ/K2mol below 1.4 K, suggesting that a Fermi surface forms at finite temperatures in this inorganic insulator. (a) The temperature dependencies of CM/T and the magnetic entropy variation SM; (b) The temperature dependence of CM (open symbols). The solid lines are fits to CM. H. D. Zhou , E. S Choi, G. Li, L. Balicas, C. R. Wiebe, Y. Qiu, J. R.D. Copley, J. S. Gardner, Phys. Rev. Lett., 106, 147204 (2011).

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