New Heat-Capacity Measurements of the Possible Order-Disorder Transition in the 4/7-phase of 2D Helium

TL;DR

This paper introduces a new heat-capacity measurement system using high-quality ZYX graphite to investigate the order-disorder transition in the 4/7-phase of 2D helium, providing preliminary data and detailed instrumentation.

Contribution

It presents a novel heat-capacity measurement setup with improved crystallinity and detailed instrumentation for studying 2D helium transitions.

Findings

Preliminary heat-capacity data obtained.

Instrumentation includes a hydraulic-pressure-operated heat switch.

Use of ZYX graphite enhances measurement quality.

Abstract

We have developed a new heat-capacity measuring system with ZYX graphite that is known to have much better crystallinity than Grafoil and started data collection. We report preliminary data as well as a detailed description of instrumentation including a mechanical heat-switch operated by hydraulic pressure of superfluid helium-4.