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A Triangular Frustrated Eu(II)-Organic Framework for Sub-Kelvin Magnetic Refrigeration.
J Am Chem Soc
January 2025
Department of Chemistry, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Attaining sub-Kelvin temperatures remains technologically challenging and often relies on the scarce resource He, unless employing adiabatic demagnetization refrigeration. Herein, the active coolant typically consists of weakly coupled paramagnetic ions, whose magnetic interaction strengths are comparable in energy to the relevant temperature regime of cooling. Such interactions depend strongly on inter-ion distances, fundamentally hindering the realization of dense coolants for sub-Kelvin refrigeration.
View Article and Find Full Text PDFMagnetic-field coils for metastability-exchange optical pumping, spectroscopy, and magnetic resonance of helium.
Rev Sci Instrum
August 2024
Laboratoire Kastler Brossel, ENS-Université PSL, CNRS, Sorbonne Université, Collège de France, 24 rue Lhomond, 75005 Paris, France.
Optical pumping on the 23S-23P transition (1083 nm) of metastable 3He or 4He atoms is used for science and applications. Gas is usually enclosed in elongated cells with lengths ranging from several centimeters to several meters for efficient absorption. Good magnetic-field homogeneity is needed for weak diffusion-induced relaxation and long nuclear magnetic resonance (NMR) signal lifetimes.
View Article and Find Full Text PDFA study of helium-3 nuclear magnetic relaxation mechanism in contact with 20 nm DyF nanoparticles.
J Magn Reson
May 2024
Kazan Federal University, Institute of Physics, Kremlevskaya 18, Kazan 420008, Russian Federation.
The spin kinetics of adsorbed and liquid He in contact with a mixture of LaF (99.67 %) and DyF (0.33 %) 20 nm powders at temperatures of 1.
View Article and Find Full Text PDFFully gapped pairing state in spin-triplet superconductor UTe.
Sci Adv
February 2024
Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
The recently discovered superconductor UTe is a promising candidate for spin-triplet superconductors, but the symmetry of the superconducting order parameter remains highly controversial. Here, we determine the superconducting gap structure by the thermal conductivity of ultraclean UTe single crystals. We find that the -axis thermal conductivity divided by temperature κ/ in zero-temperature limit is vanishingly small for both magnetic field ‖ and ‖ axes up to / ∼ 0.
View Article and Find Full Text PDFMachine Learning and CT Texture Features in Ex-smokers with no CT Evidence of Emphysema and Mildly Abnormal Diffusing Capacity.
Acad Radiol
June 2024
Robarts Research Institute, Western University, 1151 Richmond St N, London, N6A 5B7, Canada (M.S., G.P.); Department of Medical Biophysics, Western University, London, Canada (M.S., G.P.); Division of Respirology, Department of Medicine (D.G.M., G.P.); School of Biomedical Engineering, Western University, London, Canada (G.P.). Electronic address:
Rationale And Objectives: Ex-smokers without spirometry or CT evidence of chronic obstructive pulmonary disease (COPD) but with mildly abnormal diffusing capacity of the lungs for carbon monoxide (DL) are at higher risk of developing COPD. It remains difficult to make clinical management decisions for such ex-smokers without other objective assessments consistent with COPD. Hence, our objective was to develop a machine-learning and CT texture-analysis pipeline to dichotomize ex-smokers with normal and abnormal DL (DL≥75% and DL<75%).
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