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TT: Fachverband Tiefe Temperaturen
TT 65: Frustrated Magnets: General I
TT 65.4: Talk
Thursday, March 21, 2024, 10:15–10:30, H 2053
Impact of magnetic frustration and site randomness on millikelvin adiabatic demagnetization refrigeration performance of rare-earth oxides — •Tim Treu1, Prachi Telang1, Marvin Klinger1, Unnikrishnan Arjun2, Anton Jesche1, and Philipp Gegenwart1 — 1Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg — 2Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore
Recently Ytterbium- and Gadolinium-oxide based frustrated magnets have been characterized as excellent millikelvin adiabatic demagnetization refrigerants. Compared to traditional paramagnetic hydrated salts, they offer several advantages: higher entropy density for similar minimal temperatures, chemical stability and UHV compatibility. We report a comparative study of various different Yb- and Gd-based oxides (including [1-4] and further unpublished results) and analyze the impact of geometrical frustration and site-randomness on their ADR performance.
Work supported by the German Research Foundation through project 514162746 (GE 1640/11-1).
[1] Y. Tokiwa et al., Commun. Mater. 2 (2021) 42
[2] A. Jesche et al., Phys. Rev. B 107 (2023) 104402
[3] U. Arjun et al., Phys. Rev. Applied 20 (2023) 014013
[4] U. Arjun et al., arXiv:2310.00961.
Keywords: Adiabatic demagnetization refrigeration; Sub-Kelvin temperature; Magnetic order