Direct Imaging of Transition-Edge Sensors with Scanning SQUID Microscopy
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909333228355584 |
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| author | Walker, Samantha Kaczmarek, Austin Austermann, Jason Bennett, Douglas Duff, Shannon M. Hubmayr, Johannes Keller, Ben Morgan, Kelsey Murphy, Colin C. Swetz, Daniel Ullom, Joel Niemack, Michael D. Nowack, Katja C. |
| author_facet | Walker, Samantha Kaczmarek, Austin Austermann, Jason Bennett, Douglas Duff, Shannon M. Hubmayr, Johannes Keller, Ben Morgan, Kelsey Murphy, Colin C. Swetz, Daniel Ullom, Joel Niemack, Michael D. Nowack, Katja C. |
| contents | Significant advancements have been made in understanding the physics of transition-edge sensors (TESs) over the past decade. However, key questions remain, particularly a detailed understanding of the current-dependent resistance of these detectors when biased within their superconducting transition. We use scanning superconducting quantum interference device (SQUID) microscopy (SSM) to image the local diamagnetic response of aluminum-manganese alloy (Al-Mn) transition-edge sensors (TESs) near their critical temperature of approximately 175 mK. By doing so, we gain insights into how the device dimensions influence TES transition width, which in turn affects device operation and informs optimal device design. Our images reveal that the Al-Mn thin film near the niobium (Nb) leads exhibits an excess diamagnetic response at temperatures several milli-Kelvin (mK) higher than the bulk of the film farther from the contacts. A possible origin of this behavior is a longitudinal proximity effect between the Nb and Al-Mn where the TES acts as a weak link between superconducting leads. We discuss how this effect shapes the temperature dependence of the resistance as the spacing between the leads decreases. This work demonstrates that magnetic imaging with SSM is a powerful tool for local characterization of superconducting detectors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_01940 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Direct Imaging of Transition-Edge Sensors with Scanning SQUID Microscopy Walker, Samantha Kaczmarek, Austin Austermann, Jason Bennett, Douglas Duff, Shannon M. Hubmayr, Johannes Keller, Ben Morgan, Kelsey Murphy, Colin C. Swetz, Daniel Ullom, Joel Niemack, Michael D. Nowack, Katja C. Superconductivity Instrumentation and Methods for Astrophysics Mesoscale and Nanoscale Physics Significant advancements have been made in understanding the physics of transition-edge sensors (TESs) over the past decade. However, key questions remain, particularly a detailed understanding of the current-dependent resistance of these detectors when biased within their superconducting transition. We use scanning superconducting quantum interference device (SQUID) microscopy (SSM) to image the local diamagnetic response of aluminum-manganese alloy (Al-Mn) transition-edge sensors (TESs) near their critical temperature of approximately 175 mK. By doing so, we gain insights into how the device dimensions influence TES transition width, which in turn affects device operation and informs optimal device design. Our images reveal that the Al-Mn thin film near the niobium (Nb) leads exhibits an excess diamagnetic response at temperatures several milli-Kelvin (mK) higher than the bulk of the film farther from the contacts. A possible origin of this behavior is a longitudinal proximity effect between the Nb and Al-Mn where the TES acts as a weak link between superconducting leads. We discuss how this effect shapes the temperature dependence of the resistance as the spacing between the leads decreases. This work demonstrates that magnetic imaging with SSM is a powerful tool for local characterization of superconducting detectors. |
| title | Direct Imaging of Transition-Edge Sensors with Scanning SQUID Microscopy |
| topic | Superconductivity Instrumentation and Methods for Astrophysics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.01940 |