Authors:

Adib Kabir

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About Paper:

Precise measurements of heat capacity are crucial for constructing ultra-sensitive thermometers on the mesoscopic scale to study the contributions from fermions, bosons, and anyons, and to identify the presence of a spin gap in quantum spin liquid (QSL) materials at low temperatures. This research aims to develop an ultra-sensitive heat capacity measurement platform for use within a dilution refrigerator, particularly at temperatures below 1.8 K under high magnetic fields, where traditional technologies like PPMS are less effective. The puck is constructed by placing two gold-coated optical fibers parallel on a circular PEEK washer, with a bare Cernox CX-1010 sensor positioned between the fibers. Initially, we aim to measure the heat capacity of the CX-1010 sensor as the addenda, capturing background and noise effects. Subsequently, we place the QSL crystal on the sensor and determine the total heat capacity. By subtracting the addenda measurement from the heat capacity of the entire system, we can determine the material's heat capacity with high sensitivity. This heat capacity measuring system will provide insights into the release of entropy for different quasiparticles and will serve as a platform for testing various thermometry methods. Keywords: Heat Capacity; Quantum Spin Liquid (QSL); Cernox CX-1010; Dilution Refrigerator; PPMS

Source:

Purdue University / 2024

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Co-authors:

Adib Kabir