Arjun, U and Ranjith, KM and Jesche, A and Hirschberger, F and Sarma, DD and Gegenwart, P (2023) Adiabatic demagnetization refrigeration to millikelvin temperatures with the distorted square lattice magnet NaYbGeO4. In: Physical Review B, 108 (22).
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Abstract
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. © 2023 American Physical Society.
| Item Type: | Journal Article |
|---|---|
| Publication: | Physical Review B |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | Crystal lattices; Demagnetization; Germanium compounds; Magnetocaloric effects; Refrigeration; Sodium compounds; Temperature; Ytterbium compounds, Adiabatic demagnetization; Candidate materials; Lattice arrangements; Low temperature thermodynamics; Measurements of; Millikelvin; Millikelvin temperatures; Spin 1/2; Square lattices; Thermodynamic measurements, Specific heat |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 16 Nov 2024 15:59 |
| Last Modified: | 16 Nov 2024 15:59 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85324 |
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