Field-Orientation Dependent Heat Capacity Measurements at Low Temperatures with a Vector Magnet System

TL;DR

This paper presents a precise low-temperature heat capacity measurement system utilizing a vector magnet and mechanical rotator, enabling detailed study of magnetic field orientation effects with high reproducibility and angular resolution.

Contribution

The authors developed a novel measurement system combining a vector magnet and mechanical rotator for accurate, low-temperature heat capacity measurements with minimal mechanical heating.

Findings

Achieved angular resolution better than 0.01 degree.

Demonstrated high reproducibility of magnetic field orientation.

System applicable to various measurements requiring large sample space.

Abstract

We describe a heat capacity measurement system for the study of the field-orientation dependence for temperatures down to 50 mK. A "Vector Magnet" combined with a mechanical rotator for the dewar enables the rotation of the magnetic field without mechanical heating in the cryostat by friction. High reproducibility of the field direction, as well as an angular resolution of better than 0.01 degree, is obtained. This system is applicable to other kinds of measurements which require a large sample space or an adiabatic sample environment, and can also be used with multiple refrigerator inserts interchangeably.