Quantum 2025 – wissenschaftliches Programm

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THU: Thursday Contributed Sessions

THU 13: Poster Session: Applications

THU 13.90: Poster

Donnerstag, 11. September 2025, 16:30–18:30, ZHG Foyer 1. OG

Integrating Adiabatic Demagnetization Refrigeration with PPMS for Sub-50 mK Studies — •Marvin Klinger, Anna Klinger, Jorginho Villar Guerrero, Tim Treu, Anton Jesche, and Philipp Gegenwart — Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg

Accessing temperatures in the millikelvin regime is crucial for exploring fundamental quantum phenomena and advancing fields like quantum computing, superconductivity, and low-temperature physics. While 3He/4He dilution refrigeration has been the traditional approach, adiabatic demagnetization refrigeration (ADR) is gaining renewed attention as a cost-effective alternative [1]. Conventional ADR systems using hydrated salts face challenges regarding chemical instability and thermal contact degradation. To address these limitations, we have developed novel materials, enabling reliable measurements below 50 mK [2]. Our custom ADR insert for the Quantum Design PPMS achieves temperatures below 30 mK for several hours without any modification to the host cryostat. The system offers multiple experimental capabilities, including electrical transport, stress/strain and heat capacity measurements.
[1] T. Treu, M. Klinger, N. Oefele, P. Telang, A. Jesche and P. Gegenwart, J. Phys. Condens. Matter 37, 013001 (2025)
[2] Y. Tokiwa, S. Bachus, K. Kavita, A. Jesche, A. Tsirlin, and P. Gegenwart, Commun. Mater. 2 (2021) 42.

Keywords: Refrigeration; ADR; Frustrated magnetism; Low temperature; Demagnetization