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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2501.17659 |
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| _version_ | 1866909469535895552 |
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| author | Kondedan, Neha Rydh, Andreas |
| author_facet | Kondedan, Neha Rydh, Andreas |
| contents | Heat capacity measurements under high pressure places high demands on the calorimeter. Here we describe the development of a miniaturized nanocalorimeter for high-pressure heat capacity measurements at low temperature. The device, fabricated on a silicon substrate, employs a high-frequency AC calorimetry technique and features a design with an outer diameter of 300 $μ$m and thickness of 25-40 $μ$m, small enough to fit into high pressure diamond anvil cells. Miniaturization is achieved by stacking all components, including thermometer and heaters, within a central area. The thin-film calorimeter thermometer measures 40 $μ$m square and maintains the sensitivity and properties of larger thermometers. The fabrication process uses controlled anisotropic etch to produce calorimeter chips with a balance between robustness and thickness, suitable for experiments at high pressures and low temperatures. The calorimeter operates at a relatively high characteristic frequency between 10 Hz and 1 kHz, constraining the thermal oscillation to an effective volume dominated by the sample, thereby avoiding the use of a suspended membrane that is the basis for conventional nanocalorimeters. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_17659 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Miniaturized chip calorimeter for high-pressure cells at low temperature Kondedan, Neha Rydh, Andreas Instrumentation and Detectors High Energy Physics - Experiment Heat capacity measurements under high pressure places high demands on the calorimeter. Here we describe the development of a miniaturized nanocalorimeter for high-pressure heat capacity measurements at low temperature. The device, fabricated on a silicon substrate, employs a high-frequency AC calorimetry technique and features a design with an outer diameter of 300 $μ$m and thickness of 25-40 $μ$m, small enough to fit into high pressure diamond anvil cells. Miniaturization is achieved by stacking all components, including thermometer and heaters, within a central area. The thin-film calorimeter thermometer measures 40 $μ$m square and maintains the sensitivity and properties of larger thermometers. The fabrication process uses controlled anisotropic etch to produce calorimeter chips with a balance between robustness and thickness, suitable for experiments at high pressures and low temperatures. The calorimeter operates at a relatively high characteristic frequency between 10 Hz and 1 kHz, constraining the thermal oscillation to an effective volume dominated by the sample, thereby avoiding the use of a suspended membrane that is the basis for conventional nanocalorimeters. |
| title | Miniaturized chip calorimeter for high-pressure cells at low temperature |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2501.17659 |