Gálico Diogo Alves, Murugesu Muralee
Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie, Ottawa, Ontario, K1N 6N5, Canada.
Angew Chem Int Ed Engl. 2023 Oct 2;62(40):e202309152. doi: 10.1002/anie.202309152. Epub 2023 Aug 29.
Remote temperature probing at the cryogenic range is of utmost importance for the advancement of future quantum technologies. Despite the notable achievements in luminescent thermometers, accurately measuring temperatures below 10 K remains a challenging endeavor. In this study, we propose a novel magneto-optical thermometric approach based on the magnetic-circular dichroism (MCD) technique, which offers unprecedented capabilities for meticulous temperature variation analysis at cryogenic temperatures. The inherent temperature sensitivity of the MCD C-term, in conjunction with both positive and negative signals, enables highly sensitive magneto-optical temperature probing. Additionally, a groundbreaking relative thermal sensitivity value of 95.3 % K at 2.54 K can be achieved using a mononuclear lanthanide complex, [[Ho(acac) (phen)], in the presence of a 0.25 T applied magnetic field and using a combination of multiparametric thermal read-out with multiple regression. These results unequivocally demonstrate the viability and effectiveness of our methodology for cryogenic temperature sensing.
在极低温范围内进行远程温度探测对于未来量子技术的发展至关重要。尽管发光温度计取得了显著成就，但精确测量低于10 K的温度仍然是一项具有挑战性的工作。在本研究中，我们提出了一种基于磁圆二色性（MCD）技术的新型磁光测温方法，该方法为在低温下细致分析温度变化提供了前所未有的能力。MCD C项固有的温度敏感性，结合正信号和负信号，实现了高灵敏度的磁光温度探测。此外，在0.25 T的外加磁场下，使用单核镧系配合物[[Ho(acac) (phen)]，并结合多参数热读出和多元回归，在2.54 K时可实现95.3 % K的突破性相对热灵敏度值。这些结果明确证明了我们的低温温度传感方法的可行性和有效性。
