# Comparative experimental and theoretical study on anomalous Nernst effect of Heusler alloy Co 2 FeSi thin film: estimation of on-site Coulomb interaction at Co site
https://mdr.nims.go.jp/datasets/cdce1471-ff9a-4e3b-aaec-63228d538714
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## Id
cdce1471-ff9a-4e3b-aaec-63228d538714
## Local identifier
## Visibility
open_to_public
## State
published
## Created at
2025-10-30T07:46:45.943190Z
## Updated at
2025-11-06T03:30:05.889131Z
## Published at
2025-11-06T03:24:55.375791Z
## Doi
## First published url
https://doi.org/10.1080/14686996.2025.2564061
## Date published
2025-12-31
## Recorded date published
2025-12-31
## Resource type
journal_article
## Manuscript type
vor
## Collection
## Title
- title: |-
Comparative experimental and theoretical study on anomalous Nernst effect of Heusler alloy Co
2
FeSi thin film: estimation of on-site Coulomb interaction at Co site
title_type: original
lang: en
## Description
- description: Co2FeSi is considered a half-metallic ferromagnet and a Weyl semimetal,
however, its predicted properties have been shown to be heavily influenced by
how the on-site Coulomb interaction is incorporated, which remains controversial.
In this study, we measure the anomalous Nernst conductivity (αxy) and anisotropic
magnetoresistance (AMR) effect of a Co2FeSi thin film from low temperature to
room temperature, and compare the results with those of first-principles calculations
using different values for on-site Coulomb interaction at the Co site (UCo). Our
measurements reveal that αxy is less than 0.1 A m−1 K−1 at room temperature and
decreases slightly with the temperature. The observed values of αxy are more than
one order of magnitude smaller than the predictions unless a small but finite
UCo is incorporated. The AMR effect exhibits a notable sign change from negative
to positive with increasing temperature, which is inconsistent with the predicted
band structure calculated using a large UCo value. By combining these experimental
observations with first-principles calculations, we estimate that the appropriate
UCo value is approximately 1–2 eV. Our findings provide valuable insight into
the correlation effect in Co2FeSi, emphasizing the critical role of the on-site
Coulomb interaction in accurately describing the transport properties of Co-based
Heusler alloys.
description_type: abstract
lang: und
## Creator
- name: Weinan Zhou
role: author
orcid: https://orcid.org/0000-0003-2946-9913
- name: Keisuke Masuda
role: author
orcid: https://orcid.org/0000-0002-6884-6390
- name: Kazuki Sumida
role: author
orcid: https://orcid.org/0000-0002-5783-3703
- name: Yuichi Fujita
role: author
orcid: https://orcid.org/0000-0002-1798-1066
- name: Akio Kimura
role: author
orcid: https://orcid.org/0000-0002-1501-3918
- name: Yuya Sakuraba
role: author
orcid: https://orcid.org/0000-0003-4618-9550
## Contact agent
## Publisher
organization: Informa UK Limited
## Managing organization
## Keyword
- subject: Heusler alloy
schema: not_defined
- subject: Co2FeSi
schema: not_defined
- subject: on-site Coulomb interaction
schema: not_defined
- subject: anomalous Nernst effect
schema: not_defined
- subject: anomalous Nernst conductivity
schema: not_defined
- subject: anisotropic magnetoresistance effect
schema: not_defined
- subject: anomalous Hall effect
schema: not_defined
## Rights
- identifier: https://creativecommons.org/licenses/by/4.0/
## Other identifier(s)
## Data origin
## Embargo
## Journal
- title: Science and Technology of Advanced Materials
issn: '14686996'
volume: '26'
issue: '1'
article_number: '2564061'
## Conference
## Related item
## Funding
## Instrument
## Instrument operator
## Instrument managing organization
## Measurement method
## Specimen
## Chemical composition
## Structure for specimen
## Structural feature for specimen
## Specific property for specimen
## Process for specimen treatment
## Computational method
## Energy level/transition state
## Software
## Custom property
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fileset_id: d66f0e7e-f1b4-4513-af5d-75d0d3c6d571
filename: Comparative experimental and theoretical study on anomalous Nernst effect
of Heusler alloy Co2FeSi thin film estimation of on-site Coulomb interactio.pdf