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TT: Fachverband Tiefe Temperaturen
TT 36: Nanotubes, BEC, Cryocoolers: Poster
TT 36.7: Poster
Mittwoch, 19. März 2025, 15:00–18:00, P3
Sub-50 mK Adiabatic Demagnetization Refrigeration with Frustrated Yb-Oxide Magnets in the PPMS — •Anna Klinger, Jorginho Villar Guerrero, Marvin Klinger, Tim Treu, Anton Jesche, and Philipp Gegenwart — Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg
Accessing temperatures in the millikelvin (mK) regime is a prerequisite for quantum-matter research and quantum technologies. Adiabatic demagnetization refrigeration (ADR) is a simple and sustainable alternative to 3He/4He dilution refrigeration. We have shown recently, that geometrically frustrated Yb-oxides feature important advantages compared to the traditionally utilized hydrated paramagnetic salts for mK-ADR [1,2]. We report the development of Yb-oxide-based customized ADR cooling platforms for the use in the Quantum Design Physical Property Measurement System (PPMS) ®. Temperatures below 50 mK and hold times of several hours are demonstrated. Our ADR insert offers multiple experimental capabilities, including electrical transport, stress/strain and heat capacity measurements.
[1] Y. Tokiwa et al., Commun. Mater. 2 (2021) 42.
[2] T. Treu et al., J. Phys. Condens. Matter 37, 013001 (2025).
Keywords: Adiabatic Demagnetization Refrigeration; low temperature