# YbCo2: Large magnetic entropy change per volume in Yb-based metallic magnetic refrigerants for sub-Kelvin temperature

https://mdr.nims.go.jp/datasets/9ca24899-ce1c-45bb-9b14-e1f254559cb7

## File

- [YbCo2_ADR (002).pdf](https://mdr.nims.go.jp/filesets/09201798-9432-4198-944c-d19858c87ee4/download) ([Detail](https://mdr.nims.go.jp/filesets/09201798-9432-4198-944c-d19858c87ee4.md))

## Id

9ca24899-ce1c-45bb-9b14-e1f254559cb7

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-11-28T04:26:05.703463Z

## Updated at

2025-11-28T07:30:19.020071Z

## Published at

2025-11-28T07:21:59.787091Z

## Doi

https://doi.org/10.48505/nims.5939

## First published url

https://doi.org/10.1063/5.0287094

## Date published

2025-09-08

## Recorded date published

2025-9-8

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: 'YbCo2: Large magnetic entropy change per volume in Yb-based metallic magnetic
    refrigerants for sub-Kelvin temperature'
  title_type: original
  lang: en

## Description

- description: "A Yb-based intermetallic compound YbCo2 exhibiting a magnetic-field-induced
    order is known to show a giant specific heat divided by temperature, C/T ~ 6.5
    J/K2 mol, around 0.3 K. We investigate the potential of this substance as the
    magnetic refrigerants by measuring the thermodynamic properties down to 0.1 K.
    The entropy change per volume by applying magnetic field of 3 T is found to be
    -Delta_S_M ~ 0.15 J/K cm3 around 1K. This value is particularly large in the Yb-based
    metallic magnetic refrigerants to provide the sub-Kelvin temperature. In addition,\r\nwe
    demonstrate that a 2.2 g sample is cooled down to 0.26 K by the adiabatic demagnetization
    refrigeration from 1.8 K and 12 T. This cooling performance is attributed to the
    ground state, at zero field, locating around the boundary between the field-induced
    ordered phase and the paramagnetic one. Our study clarifies the utility of the
    sub-Kelvin magnetic refrigerants, which combine the large Delta_S_M and the high
    thermal conductivity of metal."
  description_type: abstract
  lang: und

## Creator

- name: Yasuyuki Shimura
  role: author
  orcid: https://orcid.org/0000-0002-2598-1277
- name: Ryoma Yokoo
  role: author
  orcid: https://orcid.org/0009-0009-0421-515X
- name: Kanta Watanabe
  role: author
  orcid: https://orcid.org/0009-0000-1195-5409
- name: Hiroto Furuie
  role: author
- name: Naohito Tsujii
  role: author
  orcid: https://orcid.org/0000-0002-6181-5911
- name: Kazunori Umeo
  role: author
  orcid: https://orcid.org/0000-0001-9442-4143
- name: Takahiro Onimaru
  role: author
  orcid: https://orcid.org/0000-0001-9990-3098

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: YbCo2
  schema: not_defined
- subject: Yb compounds
  schema: not_defined
- subject: Magnetic entropy
  schema: not_defined
- subject: Heavy Fermion
  schema: not_defined

## Rights

- description: 'This article may be downloaded for personal use only. Any other use
    requires prior permission of the author and AIP Publishing. This article appeared
    in Yasuyuki Shimura, Ryoma Yokoo, Kanta Watanabe, Hiroto Furuie, Naohito Tsujii,
    Kazunori Umeo, Takahiro Onimaru; YbCo2: Large magnetic entropy change per volume
    in Yb-based metallic magnetic refrigerants for sub-Kelvin temperature. Appl. Phys.
    Lett. 8 September 2025; 127 (10): 102403 and may be found at https://doi.org/10.1063/5.0287094.'
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Applied Physics Letters
  issn: '00036951'
  volume: '127'
  issue: '10'
  article_number: '102403'

## Conference



## Related item



## Funding

- identifier: JPMJFR2233
  funder_name: Fusion Oriented REsearch for disruptive Science and Technology
- identifier: JP22K03529
  funder_name: Japan Society for the Promotion of Science
- identifier: 23H04866
  funder_name: Japan Society for the Promotion of Science
- identifier: 23H04870
  funder_name: Japan Society for the Promotion of Science
- identifier: and 24K21692
  funder_name: Japan Society for the Promotion of Science
- identifier: '8'
  funder_name: Kyoto Technoscience Center
- identifier: 21KK-191
  funder_name: Mazda Foundation

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## Measurement method



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## Chemical composition



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## Fileset

- id: '09201798-9432-4198-944c-d19858c87ee4'
  filename: YbCo2_ADR (002).pdf
  content_type: application/pdf
  size: 4482217
  md5: ac22aa852dd5819d735f439448d37244

## Thumbnail

fileset_id: '09201798-9432-4198-944c-d19858c87ee4'
filename: YbCo2_ADR (002).pdf