Metallic local-moment magnetocalorics as a route to cryogenic refrigeration

Thomas Gruner; Jiasheng Chen; Dongjin Jang; Jacintha Banda; Christoph Geibel; Manuel Brando; F. Malte Grosche

doi:10.1038/s43246-024-00494-4

Metallic local-moment magnetocalorics as a route to cryogenic refrigeration

Thomas Gruner^*
, Jiasheng Chen
, Dongjin Jang
, Jacintha Banda
, Christoph Geibel
, Manuel Brando
, F. Malte Grosche^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

11 Citations (Scopus)

2 Downloads (CityUHK Scholars)

Abstract

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 YbNi_1.6Sn as an attractive alternative to conventional refrigerants. YbNi_1.6Sn retains high entropy into the 100 mK regime and avoids the noble metal constituents of alternative refrigerants. Demagnetisation tests demonstrate that YbNi_1.6Sn 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 YbNi_1.6Sn in the extreme local moment limit on the generalised Kondo lattice phase diagram. © The Author(s) 2024.

Original language	English
Article number	63
Number of pages	7
Journal	Communications Materials
Volume	5
Online published	26 Apr 2024
DOIs	https://doi.org/10.1038/s43246-024-00494-4
Publication status	Published - 2024
Externally published	Yes

Funding

This work was supported by the EPSRC of the UK through grant EP/P023290/1. T.G. acknowledges support by the Alexander von Humboldt Foundation within the Feodor Lynen Research Fellowship and by Darwin College (Cambridge, UK). We are indebted to J.G. Sereni, I. Hepburn and R. Temirov for useful discussions. Moreover, we thank M. Baenitz and R. Hempel-Weber.

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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title = "Metallic local-moment magnetocalorics as a route to cryogenic refrigeration",

abstract = "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 YbNi1.6Sn 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. {\textcopyright} The Author(s) 2024.",

author = "Thomas Gruner and Jiasheng Chen and Dongjin Jang and Jacintha Banda and Christoph Geibel and Manuel Brando and Grosche, \{F. Malte\}",

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T1 - Metallic local-moment magnetocalorics as a route to cryogenic refrigeration

AU - Gruner, Thomas

AU - Chen, Jiasheng

AU - Jang, Dongjin

AU - Banda, Jacintha

AU - Geibel, Christoph

AU - Brando, Manuel

AU - Grosche, F. Malte

PY - 2024

Y1 - 2024

N2 - 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 YbNi1.6Sn 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. © The Author(s) 2024.

AB - 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 YbNi1.6Sn 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. © The Author(s) 2024.

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U2 - 10.1038/s43246-024-00494-4

DO - 10.1038/s43246-024-00494-4

M3 - RGC 21 - Publication in refereed journal

SN - 2662-4443

VL - 5

JO - Communications Materials

JF - Communications Materials

M1 - 63

ER -

Metallic local-moment magnetocalorics as a route to cryogenic refrigeration

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