Metallic local-moment magnetocalorics as a route to cryogenic refrigeration
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866914779063386112 |
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| author | Gruner, Thomas Chen, Jiasheng Jang, Dongjin Banda, Jacintha Geibel, Christoph Brando, Manuel Grosche, F. Malte |
| author_facet | Gruner, Thomas Chen, Jiasheng Jang, Dongjin Banda, Jacintha Geibel, Christoph Brando, Manuel Grosche, F. Malte |
| contents | Commercial adiabatic demagnetisation refrigerators still employ the same hydrated salts that were first introduced over 85 years ago. The inherent limitations of these insulating magnetocalorics - poor thermal conductivity at sub-Kelvin temperatures, low entropy density, corrosiveness - can be overcome by a new generation of rare-earth based metallic magnetocalorics. Here, we present the metallic magnetocaloric YbNi1.6 Sn as an attractive alternative to conventional refrigerants. YbNi1.6Sn retains high entropy into the 100 mK regime and avoids the noble metal constituents of alternative refrigerants. Demagnetisation tests demonstrate that YbNi1.6Sn enables economical and durable alternatives to traditional cooling devices for temperatures reaching below 120 mK. We find that the magnetocaloric properties of this material are facilitated by unusually small Kondo and RKKY interactions, which position YbNi1.6Sn in the extreme local moment limit on the generalised Kondo lattice phase diagram. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_00460 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Metallic local-moment magnetocalorics as a route to cryogenic refrigeration Gruner, Thomas Chen, Jiasheng Jang, Dongjin Banda, Jacintha Geibel, Christoph Brando, Manuel Grosche, F. Malte Strongly Correlated Electrons Commercial adiabatic demagnetisation refrigerators still employ the same hydrated salts that were first introduced over 85 years ago. The inherent limitations of these insulating magnetocalorics - poor thermal conductivity at sub-Kelvin temperatures, low entropy density, corrosiveness - can be overcome by a new generation of rare-earth based metallic magnetocalorics. Here, we present the metallic magnetocaloric YbNi1.6 Sn as an attractive alternative to conventional refrigerants. YbNi1.6Sn retains high entropy into the 100 mK regime and avoids the noble metal constituents of alternative refrigerants. Demagnetisation tests demonstrate that YbNi1.6Sn enables economical and durable alternatives to traditional cooling devices for temperatures reaching below 120 mK. We find that the magnetocaloric properties of this material are facilitated by unusually small Kondo and RKKY interactions, which position YbNi1.6Sn in the extreme local moment limit on the generalised Kondo lattice phase diagram. |
| title | Metallic local-moment magnetocalorics as a route to cryogenic refrigeration |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2405.00460 |