Abstract
Thermodynamic properties of the proton-mediated single component dimer-Mott insulator of , which has a two-dimensional triangle lattice structure of spins, are reported. The extraordinary large electronic heat capacity coefficient observed by the low-temperature heat capacity measurements up to 6 T suggests the formation of the gapless spin liquid ground state. Although the magnetic interaction is quite different from those of other dimer-Mott spin liquids, the thermodynamic feature scales well with the Wilson ratio of 1.4–1.6. The heat capacity measurements also detected that the deuteration of the proton-linkage changes the ground state to the nonmagnetic one with almost vanishing γ. Using the data of the deuterated compound, the accurate temperature dependence of the magnetic heat capacity reflecting on the low-energy excitations from the gapless spin liquids ground state is discussed.
- Received 18 December 2016
- Revised 12 March 2017
DOI:https://doi.org/10.1103/PhysRevB.95.184425
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