Adiabatic demagnetization refrigeration to millikelvin temperatures with the distorted square lattice magnet NaYbGeO4
- We report the synthesis, characterization, low-temperature magnetic, and thermodynamic measurements of the millikelvin adiabatic demagnetization refrigeration (mK-ADR) candidate material NaYbGeO4 which exhibits a distorted square lattice arrangement of YbO6 magnetic units. Magnetization and specific heat indicate weakly interacting effective spin-1/2 moments below 10 K, with a Curie-Weiss temperature of only 15 mK, that can be polarized by magnetic fields of order 1 T. For the ADR performance test, we start the demagnetization from 5 T at a temperature of ∼2K and reach a minimum temperature of 150 mK at zero field. The warming curve indicates a sharp magnetic transition in the heat capacity at 210 mK, implying only weak magnetic frustration. The entropy density of SGS≃101 mJK−1cm-3 and hold time below 2 K of 220 min are competitive while the minimal temperature is higher compared to frustrated Ytterbium-oxide ADR materials studied under similar conditions.
Author: | U. Arjun, K. M. Ranjith, Anton JescheORCiDGND, Fabian Hirschberger, D. D. Sarma, Philipp GegenwartORCiDGND |
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URN: | urn:nbn:de:bvb:384-opus4-1100931 |
Frontdoor URL | https://opus.bibliothek.uni-augsburg.de/opus4/110093 |
ISSN: | 2469-9950OPAC |
ISSN: | 2469-9969OPAC |
Parent Title (English): | Physical Review B |
Publisher: | American Physical Society (APS) |
Place of publication: | College Park, MD |
Type: | Article |
Language: | English |
Year of first Publication: | 2023 |
Publishing Institution: | Universität Augsburg |
Release Date: | 2023/12/12 |
Volume: | 108 |
Issue: | 22 |
First Page: | 224415 |
DOI: | https://doi.org/10.1103/physrevb.108.224415 |
Institutes: | Mathematisch-Naturwissenschaftlich-Technische Fakultät |
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik | |
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / Lehrstuhl für Experimentalphysik VI | |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Licence (German): | Deutsches Urheberrecht |