Abstract
We report low temperature heat capacity data on a multiple-quantum-well GaAs/AlGaAs sample in the quantum Hall regime. Relative to its low field magnitude, exhibits up to -fold enhancement near where Skyrmions are the ground state of the confined two-dimensional electrons. We attribute the large to a Skyrmion-induced, strong coupling of the nuclear spin system to the lattice. The data are consistent with the Schottky nuclear heat capacity of Ga and As atoms in the quantum wells, except at very low where vs exhibits a remarkably sharp peak, suggestive of a phase transition in the electronic system.
- Received 13 February 1996
DOI:https://doi.org/10.1103/PhysRevLett.76.4584
©1996 American Physical Society