Abstract
Nanoscale thermometers with high sensitivity are needed in domains which study quantum and classical effects at cryogenic temperatures. Here, we present a micrometer sized and nanometer thick chromium selenide cryogenic temperature sensor capable of measuring a large domain of cryogenic temperatures down to tenths of K. Hexagonal Cr-Se flakes were obtained by a simple physical vapor transport method and investigated using scanning electron microscopy, energy dispersive X-ray spectrometry and X-ray photoelectron spectroscopy measurements. The flakes were transferred onto Au contacts using a dry transfer method and resistivity measurements were performed in a temperature range from 7 K to 300 K. The collected data have been fitted by exponential functions. The excellent fit quality allowed for the further extrapolation of resistivity values down to tenths of K. It has been shown that the logarithmic sensitivity of the sensor computed over a large domain of cryogenic temperature is higher than the sensitivity of thermometers commonly used in industry and research. This study opens the way to produce Cr-Se sensors for classical and quantum cryogenic measurements.
Highlights
The cryogenic industry is mainly focused on liquefaction for increased density and separation by distillation of gases. This can be observed if we look at the liquefied gases used in chemical and metallurgical processes and at the liquid fuel used by rocket engines for green energy
Going beyond the industrial needs, the scientific community is interested in nanoscale thermometers with high sensitivity because they are usable in emergent domains such as quantum thermodynamics [1], thermal Josephson Effect [2], quantum heat engines [3] or quantum thermoelectric effects [4,5]; the need for reliable, sensitive, and easy-to-produce thermometers is high
One should note that the electrical resistivity is roughly estimated around 1 Ωcm, the CrSe hexagons might be regarded as degenerate semiconductors
Summary
The main parameter of interest in cryogenics is temperature. This should be measured with high precision and be as localized as possible. The cryogenic industry is mainly focused on liquefaction for increased density and separation by distillation of gases. This can be observed if we look at the liquefied gases used in chemical and metallurgical processes and at the liquid fuel used by rocket engines for green energy. Going beyond the industrial needs, the scientific community is interested in nanoscale thermometers with high sensitivity because they are usable in emergent domains such as quantum thermodynamics [1], thermal Josephson Effect [2], quantum heat engines [3] or quantum thermoelectric effects [4,5]; the need for reliable, sensitive, and easy-to-produce thermometers is high
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
