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

dc.contributor.author Tokiwa, Yoshifumi
dc.contributor.author Piening, Boy
dc.contributor.author Jeevan, Hirale
dc.contributor.author Bud’ko, Sergey
dc.contributor.author Canfield, Paul
dc.contributor.author Gegenwart, Philipp
dc.contributor.department Ames National Laboratory
dc.contributor.department Department of Physics and Astronomy
dc.contributor.department Ames Laboratory
dc.date 2020-01-16T18:32:12.000
dc.date.accessioned 2020-06-30T06:20:44Z
dc.date.available 2020-06-30T06:20:44Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 2016
dc.date.issued 2016-09-09
dc.description.abstract <p>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 K. However, usage of the gas has been increasingly difficult because of the current worldwide 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 Yb1−xScxCo2Zn20 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. This study opens new possibilities of using itinerant magnetic moments for cryogen-free refrigeration.</p>
dc.description.comments <p>This article is published as Tokiwa, Yoshifumi, Boy Piening, Hirale S. Jeevan, Sergey L. Bud’ko, Paul C. Canfield, and Philipp Gegenwart. "Super-heavy electron material as metallic refrigerant for adiabatic demagnetization cooling." <em>Science Advances</em> 2, no. 9 (2016): e1600835. DOI: <a href="http://dx.doi.org/10.1126/sciadv.1600835" target="_blank">10.1126/sciadv.1600835</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/physastro_pubs/572/
dc.identifier.articleid 1572
dc.identifier.contextkey 16201686
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath physastro_pubs/572
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/57357
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/physastro_pubs/572/2016_CanfieldPaul_SuperHeavy.pdf|||Sat Jan 15 00:59:34 UTC 2022
dc.source.uri 10.1126/sciadv.1600835
dc.subject.disciplines Physics
dc.subject.keywords Adiabatic demagnetization refrigeration
dc.subject.keywords heavy fermion
dc.subject.keywords quantum critical point
dc.title Super-heavy electron material as metallic refrigerant for adiabatic demagnetization cooling
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
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