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TT: Fachverband Tiefe Temperaturen

TT 65: Frustrated Magnets: General I

TT 65.4: Vortrag

Donnerstag, 21. März 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 We report a comparative study of various different Yb- and Gd-based oxides (including [1-4] and further unpublished results) and analyze the impact of geometrical frustration and site-randomness on their ADR performance.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