SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Focus Session: New Perspectives for Adiabatic Demagnetization Refrigeration in the Kelvin and sub-Kelvin Range (joint session TT/MA)

Dienstag, 28. März 2023, 09:30–13:15, HSZ 03

Efficient cooling into the Kelvin and sub-Kelvin range is a long-standing challenge relevant to both fundamental research and future quantum technologies. The standard cooling cycle based on vapor compression exploits expensive and rare helium. Low-temperature physicists world-wide are presently looking for cheaper and accessible alternatives, not to mention the need of compact cooling technology for desktop quantum technology, or special requirements for applications such as space missions and scanning tunneling microscopes. One of the key candidates is adiabatic demagnetization refrigeration (ADR). ADR is based on magnetic solids with a huge magnetocaloric effect and requires no helium. Even if paramagnetic salts are known and used for ADR applications for almost a century, there is an ongoing quest for materials with better magnetocaloric and mechanical properties, thermal conductivity, and vacuum compatibility. In this symposium, new fundamental ideas and the recent successful design and characterization of quantum materials for improved ADR will be highlighted. These materials exploit collective phenomena in correlated electron systems, such as the concept of geometrically frustrated magnetism to push the entropy to low temperatures, as well as heavy-fermion, and quantum-critical states.

Organizers: Andreas Honecker (CY Cergy Paris Université) and Jürgen Schnack (Universität Bielefeld)

	09:30	MA 13.1	Hauptvortrag: Self-cooling molecular spin quantum processors — •Marco Evangelisti, Fernando Luis, Elias Palacios, David Aguilà, and Guillem Aromí
	10:00	MA 13.2	Hauptvortrag: Triangular rare-earth borates for milli-Kelvin adiabatic demagnetization refrigeration — •Philipp Gegenwart
	10:30	MA 13.3	Hauptvortrag: A millikelvin scanning tunnelling microscope in ultra-high vacuum with adiabatic demagnetisation refrigeration — •Ruslan Temirov
	11:00		15 min. break
	11:15	MA 13.4	Hauptvortrag: ADR cryostats in low temperature physics and their applications — •Doreen Wernicke
	11:45	MA 13.5	Hauptvortrag: Frustrated dipolar materials for low-temperature magnetic refrigeration — •Mike Zhitomirsky
	12:15	MA 13.6	ADR based sub-Kelvin cryostats for applied quantum technologies — •Pau Jorba, Felix Rucker, Steffen Säubert, Alexander Regnat, Jan Spallek, and Christian Pfleiderer
	12:30	MA 13.7	ADR below the ordering temperature in triangular KBaGd(BO3)2 — •Noah Winterhalter-Stocker, Alexander Bellon, Fabian Hirschberger, Sebastian Bachus, Sebastian Erdmann, Alexander Tsirlin, Yoshifumi Tokiwa, Anton Jesche, and Philipp Gegenwart
	12:45	MA 13.8	The contribution has been withdrawn.
	13:00	MA 13.9	Study of the large rotational magnetocaloric effect in Ni(en)(H2O)4SO4·2H2O — •Róbert Tarasenko, Petro Danylchenko, Erik Čižmár, Vladimír Tkáč, Alexander Feher, Alžbeta Orendáčová, and Martin Orendáč