Abstract
Direct demagnetization has been made for two-dimensional solid in both the paramagnetic and the antiferromagnetic phases. The lowest temperature is about , judging from the observed magnetization for the paramagnetic solid . The magnetization of the antiferromagnetic solid shows a gradual increase to about for the phase adsorbed on both one layer of and two layers of HD preplated graphite. This strongly suggests that the triangular antiferromagnet with the higher order multiple exchange has a quantum spin liquid ground state with nearly zero or extremely small spin gap less than .
- Received 28 April 2003
DOI:https://doi.org/10.1103/PhysRevLett.92.025301
©2004 American Physical Society