Phys. Rev. Lett. 79, 3451–3454 (1997)Low Temperature Heat-Capacity Anomalies in Two-Dimensional Solid 3HeReceived 11 July 1997; published in the issue dated 3 November 1997 The heat capacity of second-layer solid 3He adsorbed on graphite has been measured down to extremely low temperatures below 100μK. We observed a double-peak structure for a low-density registered solid, which strongly suggests that the system is a highly frustrated spin- 1/2 two-dimensional (2D) antiferromagnet with a disordered ground state. As the density increases it approaches a 2D nearest-neighbor Heisenberg ferromagnet with a single rounded peak, which can be explained semiquantitatively by considering higher-order exchange processes up to six-spin exchange. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.79.3451
DOI:
10.1103/PhysRevLett.79.3451
PACS:
67.70.+n, 67.80.Jd, 75.10.Jm, 75.70.Ak
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