# Effect of magnetic entropy in the thermoelectric properties of Fe-doped Fe2VAl full-Heusler alloy

https://mdr.nims.go.jp/datasets/bd29b1fc-e716-4bd9-be3d-7c5462540827

## File

- [MDI-Effect of magnetic entropy in the thermoelectric properties of Fe-doped Fe2VAl full-Heusler alloy.pdf](https://mdr.nims.go.jp/filesets/1330a6ea-41ee-482a-a204-634f0a1375e4/download) ([Detail](https://mdr.nims.go.jp/filesets/1330a6ea-41ee-482a-a204-634f0a1375e4.md))

## Id

bd29b1fc-e716-4bd9-be3d-7c5462540827

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-11-23T06:22:23.534946Z

## Updated at

2024-11-25T01:53:07.809916Z

## Published at

2026-10-10T23:20:52.737171Z

## Doi

https://doi.org/10.48505/nims.5025

## First published url

https://doi.org/10.1016/j.mtphys.2024.101568

## Date published

2024-10-11

## Recorded date published

2024-11

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Effect of magnetic entropy in the thermoelectric properties of Fe-doped Fe2VAl
    full-Heusler alloy
  title_type: original
  lang: en

## Description

- description: 'The effect of spin entropy on the transport of heat/charge carriers
    in the Fe-doped full-Heusler alloy Fe2+xVAl1-x with x = 0 - 0.1 has been studied
    through low-temperature magnetic and thermoelectric measurements. Magnetization
    (M) measurements confirm- itinerant-electron weak-ferromagnetic behavior. A systematic
    increase of the magnetic transition temperature TC (from 40 K to 223 K) and of
    the saturation magnetization (from 0.13 to 0.41μB/Fe) with increasing Fe doping
    (from x = 0 to 0.1) is observed. Applying a magnetic field causes significant
    suppression of the Seebeck coefficient (S) and the entropy term (S/T) with a negative
    magnetoresistance near TC for all weak-ferromagnetic samples, demonstrating a
    clear effect of spin fluctuations. Analyzing  M(T) and S(T), we rule out sizeable
    magnon drag contributions. A large spin fluctuations-induced enhancement in the
    thermoelectric power factor  PF  of about 18% is achieved for x = 0.1 near TC
    when compared to measurements in a magnetic field of 7 T. The actual improvement
    in PF is even much higher, as the S shows a significant enhancement (about 34%)
    compared to the estimated diffusion term of S(T) at TC. The number of point defects
    also increases with Fe doping, causing a significant reduction of the lattice
    thermal conductivity. This study demonstrates the role of spin fluctuations in
    enhancing the thermopower/ thermoelectric performance of Fe-doped Fe2VAl and opens
    a vista for the strategy''s applicability for various thermoelectric materials. '
  description_type: abstract
  lang: und

## Creator

- name: Tarachand
  role: author
  orcid: https://orcid.org/0000-0002-8516-6485
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: N. Tsujii
  role: author
  orcid: https://orcid.org/0000-0002-6181-5911
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: F. Garmroudi
  role: author
- name: E. Bauer
  role: author
- name: T. Mori
  role: author
  orcid: https://orcid.org/0000-0003-2682-1846
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: thermoelectric
  schema: not_defined

## Rights

- description: "© 2024. This manuscript version is made available under the CC-BY-NC-ND
    4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/"
  identifier: https://creativecommons.org/licenses/by-nc-nd/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo

start_date: 2024-10-11
end_date: 2026-10-11

## Journal

- title: Materials Today Physics
  issn: '25425293'
  volume: '48'
  article_number: '101568'

## Conference



## Related item



## Funding

- funder_name: Japan Science and Technology Agency
- identifier: 23K23029
  funder_name: Japan Society for the Promotion of Science
- identifier: 22H01761
  funder_name: Japan Society for the Promotion of Science
- identifier: JPMJMI19A1
  funder_name: JST-Mirai Program

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



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## Fileset

- id: 1330a6ea-41ee-482a-a204-634f0a1375e4
  filename: MDI-Effect of magnetic entropy in the thermoelectric properties of Fe-doped
    Fe2VAl full-Heusler alloy.pdf
  content_type: application/pdf
  size: 1603312
  md5: a03a85f3862b0b4c377f7fac6eab85eb

## Thumbnail

fileset_id: 1330a6ea-41ee-482a-a204-634f0a1375e4
filename: MDI-Effect of magnetic entropy in the thermoelectric properties of Fe-doped
  Fe2VAl full-Heusler alloy.pdf