Tracking the evolution from isolated dimers to many-body entanglement in NaLuxYb1-xSe2
Abstract
We synthesize homogeneous compositions of NaLuxYb1-xSe2, connecting non-magnetic NaLuSe2 to the triangular lattice spin liquid candidate NaYbSe2. Thermal and magnetic properties are studied as the system evolves from one with dilute magnetic defects to one of a dense magnetic lattice. The field and temperature dependent heat capacity show the carriers of entropy crossover from isolated magnetic ions to a correlated lattice borne from spin dimers. For the dilute system we estimate the single ion anisotropy (g/g =3.13) and also the dimer exchange couplings J(=5.4~K) and J(=9.6~K), in order to draw comparison to the half-doped and full magnetic compounds.
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