# Negatively enhanced thermopower near a Van Hove singularity in electron-doped Sr2RuO4

https://mdr.nims.go.jp/datasets/4f14b3d7-3d52-46a4-93c3-47942e58f516

## File

- [PhysRevResearch.6.023222.pdf](https://mdr.nims.go.jp/filesets/ef815b62-34cb-4b51-a11e-4627edc01d0d/download) ([Detail](https://mdr.nims.go.jp/filesets/ef815b62-34cb-4b51-a11e-4627edc01d0d.md))

## Id

4f14b3d7-3d52-46a4-93c3-47942e58f516

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-06-01T16:40:48.316150Z

## Updated at

2024-06-03T03:30:13.041516Z

## Published at

2024-06-03T03:30:13.122805Z

## Doi



## First published url

https://doi.org/10.1103/physrevresearch.6.023222

## Date published

2024-05-31

## Recorded date published

2024-5

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Negatively enhanced thermopower near a Van Hove singularity in electron-doped
    Sr2RuO4
  title_type: original
  lang: en

## Description

- description: The layered perovskite Sr2RuO4 serves a model material of the two-dimensional
    (2D) Fermi liquid but also exhibits various emergent phenomena including the non-Fermi-liquid
    (NFL) behavior under external pertur- bations such as uniaxial pressure and chemical
    substitutions. Here we present the thermoelectric transport measurement of electron-doped
    system Sr(2-y)La(y)RuO(4), in which a filling-induced Lifshitz transition occurs
    at the Van Hove singularity (VHS) point of y ~ 0.2. We find that the sign of the
    low-temperature thermopower becomes negative only near the VHS point, where the
    NFL behavior has been observed in the earlier work. This observation is incompatible
    to either a numerical calculation within a constant relaxation-time approximation
    or a toy-model calculation for the 2D Lifshitz transition adopting an elastic
    carrier scattering. As an origin of the present results, we propose a skewed NFL
    state, in which an inelastic scattering with a considerable odd-frequency term
    plays a crucial role to negatively enhance the thermopower.
  description_type: abstract
  lang: und

## Creator

- name: Rei Nishinakayama
  role: author
- name: Yoshiki J. Sato
  role: author
  orcid: https://orcid.org/0000-0002-1750-0373
- name: Takayoshi Yamanaka
  role: author
  orcid: https://orcid.org/0000-0001-5330-0400
- name: Yoshiteru Maeno
  role: author
  orcid: https://orcid.org/0000-0002-3467-9416
- name: Hiroshi Yaguchi
  role: author
  orcid: https://orcid.org/0000-0002-9595-9083
- name: Naoki Kikugawa
  role: author
  orcid: https://orcid.org/0000-0003-3975-4478
- name: Ryuji Okazaki
  role: author
  orcid: https://orcid.org/0000-0001-5234-4110

## Contact agent



## Publisher

organization: American Physical Society (APS)

## Managing organization



## Keyword

- subject: Sr2RuO4, Non Fermi liquid, Lifshitz transition, Van Hove singularity, Thermopower
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Physical Review Research
  issn: '26431564'
  volume: '6'
  issue: '2'
  article_number: '023222'

## Conference



## Related item



## Funding

- identifier: 17H06136
  funder_name: Japan Society for the Promotion of Science
- identifier: 21H01033
  funder_name: Japan Society for the Promotion of Science
- identifier: 22H01166
  funder_name: Japan Society for the Promotion of Science
- identifier: 22H01168
  funder_name: Japan Society for the Promotion of Science
- identifier: 22K19093
  funder_name: Japan Society for the Promotion of Science

## 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



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## Fileset

- id: ef815b62-34cb-4b51-a11e-4627edc01d0d
  filename: PhysRevResearch.6.023222.pdf
  content_type: application/pdf
  size: 1866213
  md5: 1e1e919139e075749f130513f0e470ca

## Thumbnail

fileset_id: ef815b62-34cb-4b51-a11e-4627edc01d0d
filename: PhysRevResearch.6.023222.pdf