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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/2507.11327 |
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| _version_ | 1866916844696240128 |
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| author | Cole, Mari C. Pelly, Maximilian T. Topping, Craig V. Reindl, Thomas Waizmann, Ulrike Weis, Jürgan Rost, Andreas W. |
| author_facet | Cole, Mari C. Pelly, Maximilian T. Topping, Craig V. Reindl, Thomas Waizmann, Ulrike Weis, Jürgan Rost, Andreas W. |
| contents | Specific heat is a powerful probe offering insights into the entropy and excitation spectrum of the studied material. While it is well established, a key challenge remains the measurements of microcrystals or thin films especially in the sub-Kelvin, high magnetic field regime. Here we present a setup combining the high sensitivity of SiN$_x$ membrane based calorimetry with the absolute accuracy of Coulomb blockade thermometry to realise a nanocalorimeter for such tasks. The magnetic field independent technique of Coulomb blockade thermometry provides an on-platform thermometer combining a primary thermometry mode for in-situ calibration with a fast secondary mode suitable for specific heat measurements. The setup is validated using measurements of a 20 $μ$g sample of Sr$_3$Ru$_2$O$_7$ achieving a resolution on the order of 0.1 nJ/K at 500 mK and an absolute accuracy limited by the determination of the sample's mass. Measurements of CeRh$_2$As$_2$ further highlight the benefits of measuring microcrystals with such a device. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_11327 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Coulomb blockade thermometry based nanocalorimetry Cole, Mari C. Pelly, Maximilian T. Topping, Craig V. Reindl, Thomas Waizmann, Ulrike Weis, Jürgan Rost, Andreas W. Strongly Correlated Electrons Superconductivity Specific heat is a powerful probe offering insights into the entropy and excitation spectrum of the studied material. While it is well established, a key challenge remains the measurements of microcrystals or thin films especially in the sub-Kelvin, high magnetic field regime. Here we present a setup combining the high sensitivity of SiN$_x$ membrane based calorimetry with the absolute accuracy of Coulomb blockade thermometry to realise a nanocalorimeter for such tasks. The magnetic field independent technique of Coulomb blockade thermometry provides an on-platform thermometer combining a primary thermometry mode for in-situ calibration with a fast secondary mode suitable for specific heat measurements. The setup is validated using measurements of a 20 $μ$g sample of Sr$_3$Ru$_2$O$_7$ achieving a resolution on the order of 0.1 nJ/K at 500 mK and an absolute accuracy limited by the determination of the sample's mass. Measurements of CeRh$_2$As$_2$ further highlight the benefits of measuring microcrystals with such a device. |
| title | Coulomb blockade thermometry based nanocalorimetry |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2507.11327 |