Y. Takane et K. Nakamura, SPIN-DISORDERED STATES IN THE ANTIFERROMAGNETIC HEISENBERG-MODEL ON THE TRIANGULAR LATTICE, Physical review. B, Condensed matter, 50(13), 1994, pp. 9589-9591
To gain a starting point for an explanation of a recent experiment by
Takeda et al. on NaTiO2, the triangular-lattice antiferromagnetic Heis
enberg model with S = 1/2 is investigated by a fermion mean-field theo
ry. We find two self-consistent solutions that describe a spin disorde
red state with a finite excitation gap. Both phases are consistent wit
h the experiment and thereby should be regarded as promising candidate
s for the physical state realized in NaTiO2.