Super-heavy electron material as metallic refrigerant for adiabatic demagnetization cooling

Tokiwa, Yoshifumi; Piening, Boy; Jeevan, Hirale S.; Bud'ko, Sergey L.; Canfield, Paul C.; Gegenwart, Philipp

doi:10.1126/sciadv.1600835

Title: Super-heavy electron material as metallic refrigerant for adiabatic demagnetization cooling

Journal Article · Fri Sep 09 00:00:00 EDT 2016 · Science Advances

DOI:https://doi.org/10.1126/sciadv.1600835· OSTI ID:1342908

Tokiwa, Yoshifumi ^[1]; Piening, Boy ^[2]; Jeevan, Hirale S. ^[2]; Bud'ko, Sergey L. ^[3]; Canfield, Paul C. ^[3]; Gegenwart, Philipp ^[4]

Gottingen Univ. (Germany). I. Physikalisches Inst.; Kyoto Univ. (Japan). Dept. of Physics; Univ. of Augsburg (Germany). Experimental Physics VI, Center for Electronic Correlations and Magnetism
Gottingen Univ. (Germany). I. Physikalisches Inst.
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Gottingen Univ. (Germany). I. Physikalisches Inst.; Univ. of Augsburg (Germany). Experimental Physics VI, Center for Electronic Correlations and Magnetism

Low-temperature refrigeration is of crucial importance in fundamental research of condensed matter physics, because the investigations of fascinating quantum phenomena, such as superconductivity, superfluidity, and quantum criticality, often require refrigeration down to very low temperatures. Currently, cryogenic refrigerators with ³He gas are widely used for cooling below 1 Kelvin. However, usage of the gas has been increasingly difficult because of the current world-wide shortage. Therefore, it is important to consider alternative methods of refrigeration. We show that a new type of refrigerant, the super-heavy electron metal YbCo₂Zn₂₀, can be used for adiabatic demagnetization refrigeration, which does not require ³He gas. This method has a number of advantages, including much better metallic thermal conductivity compared to the conventional insulating refrigerants. We also demonstrate that the cooling performance is optimized in Yb_1$$-$$xSc_xCo₂Zn₂₀ by partial Sc substitution, with x ~ 0.19. The substitution induces chemical pressure that drives the materials to a zero-field quantum critical point. This leads to an additional enhancement of the magnetocaloric effect in low fields and low temperatures, enabling final temperatures well below 100 mK. This performance has, up to now, been restricted to insulators. For nearly a century, the same principle of using local magnetic moments has been applied for adiabatic demagnetization cooling. Lastly, this study opens new possibilities of using itinerant magnetic moments for cryogen-free refrigeration.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1342908

Report Number(s):: IS-J-9139

Journal Information:: Science Advances, Vol. 2, Issue 9; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Cited By (2)

${YbPd}_{2} In$ : A promising candidate for strong entropy accumulation at very low temperature Gastaldo, F.; Gabáni, S.; Džubinská, A. Physical Review B, Vol. 100, Issue 17 https://doi.org/10.1103/physrevb.100.174422	journal	November 2019
Physical properties of the very heavy fermion YbCu4Ni Sereni, J. G.; Curlík, I.; Giovannini, M. arXiv https://doi.org/10.48550/arxiv.1805.08051	text	January 2018

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