Experimental apparatus for heat capacity measurements of 2D He-3 in magnetic fields

摘要

Previous heat capacity measurement in zero magnetic field for the low-density second-layer solid He-3 adsorbed on graphite showed a peculiar double peak structure. From this measurement a "quantum spin liquid (QSL)" ground state has been suggested. Increasing the magnetic field, theories predict a transition from a QSL phase to a long-range ordered phase called "uuud" at a certain threshold field, which is a measure of the spin gap of the QSL phase. Here we describe an experimental setup for heat capacity measurements of 2D He-3 to test the predictions at temperatures below 200 muK in magnetic fields up to 1.2 T. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 6]