Automated Hall effect measurements using the van der Pauw method within the physical property measurement system...

Area of Science:

• Materials Science
• Condensed Matter Physics
• Electrical Engineering

Background:

• Accurate electronic transport measurements are crucial for characterizing materials.
• Traditional Hall resistivity measurements often require complex setups with external components.
• The Physical Property Measurement System (PPMS) is a standard platform for material property characterization.

Purpose of the Study:

• To develop an integrated, user-friendly system for Hall resistivity measurements within the PPMS.
• To eliminate the need for external switching circuits and auxiliary software.
• To enhance the accuracy and reproducibility of van der Pauw (vdP) measurements.

Main Methods:

• Developed a custom sample holder with integrated vdP switching architecture.
• Utilized the native MultiVu interface of the PPMS for measurement control.
• Performed Hall-coefficient measurements on high-purity germanium single crystals.

Main Results:

• Achieved resistance measurements from 4 μΩ to 4 MΩ within the PPMS.
• Enabled measurements across the full PPMS temperature range (1.8-400 K) and magnetic fields up to 9 T.
• Validated system performance with results in excellent agreement with literature data for germanium.

Conclusions:

• The custom instrumentation provides a simplified, self-contained, and highly reproducible workflow for Hall-effect experiments.
• This approach reduces experimental complexity and cost for vdP measurements.
• Establishes a new standard for electronic transport measurements on the PPMS platform.