Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 8: Measurement Technology and Cryogenics

TT 8.2: Talk

Monday, March 17, 2025, 15:15–15:30, H32

Magnetocaloric upgrade for the Quantum Design PPMS^® — •Marvin Klinger, Jorginho Villar Guerrero, Anna Klinger, Tim Treu, Anton Jesche, and Philipp Gegenwart — EP VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg

Achieving millikelvin temperatures presents significant challenges in experimental physics. While many laboratories operate liquid helium cryostats at 2 K, reaching very low temperatures traditionally requires dilution refrigeration - a technique demanding both specialized expertise and substantial resources. We developed an upgrade for the Quantum Design Physical Property Measurement System (PPMS^®) that overcomes these limitations. Our system employs adiabatic demagnetization refrigeration (ADR) to achieve temperatures well below 50 mK for multiple hours. The exceptional performance stems from novel quantum ADR materials that overcome disadvantages of traditional hydrated paramagnetic salts [1]. The upgrade consists of a user-friendly insert that integrates seamlessly with existing PPMS^® systems. Its modular design allows researchers to easily swap the low-temperature assembly to accommodate different experimental needs, currently supporting electrical transport, stress/strain, and heat capacity measurements. This versatility and accessibility can make sub-50 mK measurements available to a broader scientific community without the complexity of dilution refrigeration.

[1] T. Treu et al., J. Phys. Condens. Matter 37, 013001 (2025)

Keywords: magnetocalorics; adiabatic demagnetization refrigeration; physical property measurement system; low temperature upgrade