# Phase transitions and slow spin dynamics of slightly inverted A-site spinel CoAl2−xGaxO4

https://mdr.nims.go.jp/datasets/0259e89c-46d9-484a-88a2-31bc7220c9d1

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## Id

0259e89c-46d9-484a-88a2-31bc7220c9d1

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2023-12-22T03:36:45.054444Z

## Updated at

2024-01-05T13:11:13.113705Z

## Published at

2023-12-25T07:30:27.217696Z

## Doi

https://doi.org/10.48505/nims.4312

## First published url

https://doi.org/10.1088/1361-648X/ad12fc

## Date published

2024-03-27

## Recorded date published

2024-3-27

## Resource type

journal_article

## Manuscript type

authors_original

## Collection



## Title

- title: Phase transitions and slow spin dynamics of slightly inverted A-site spinel
    CoAl2−xGaxO4
  title_type: original
  lang: en

## Description

- description: 'We report the properties of an A-site spinel magnet, CoAl2−xGaxO4,
    and analyze its anomalous, low-temperature magnetic behavior, which is derived
    from inherent, magnetically frustrated interactions. Rietveld analysis of the
    x-ray diffraction profile for CoAl2−xGaxO4 revealed that the metallic ions were
    randomly distributed in the tetrahedral (A-) and octahedral (B-) sites in the
    cubic spinel structure. The inversion parameter eta could be controlled by varying
    the gallium (Ga) composition in the range 0.055 ≤ eta ≤ 0.664. The composition-induced
    Néel-to-spin-glass (NSG) transition occurred between 0.05 ≤ eta ≤ 0.08 and was
    verified by measurements of DC-AC susceptibilities chi and thermoremanent magnetization
    (TRM) below the Néel transition temperature TN. The relaxation rate and derivative
    with respect to temperature of TRM increased at both TN and the spin glass (SG)
    transition temperature TSG.  The TRM decayed rapidly above and below these transitions.
    TRM was highly sensitive to macroscopic magnetic transitions that occurred in
    both the Néel and SG phases of CoAl2−xGaxO4. In the vicinity of the NSG boundary,
    there was a maximum of the TRM relaxation rate at Tmax < TN. With increasing inversion
    eta(x), the anomaly at Tmax merged with that of the Néel transition at a tricritical
    point (etatc, Ttc) = (0.08, 4.0 K), where the paramagnetic, Néel, and SG states
    met. We successfully extracted the relaxation time tau and other characteristic
    parameters from the TRM isothermal temporal evolution based on the Weron function
    derived for a purely stochastic process. To distinguish the magnetic states, we
    compared our results with previously studied inversion-free A-site spinel, CoRh2O4,
    and CoGa2O4 cluster glass. '
  description_type: abstract
  lang: eng

## Creator

- name: T Naka
  role: author
  orcid: https://orcid.org/0000-0002-0645-6952
- name: J Valenta
  role: author
- name: T Nakane
  role: author
- name: S Ishii
  role: author
- name: M Nakayama
  role: author
- name: H Mamiya
  role: author
  orcid: https://orcid.org/0000-0002-7840-3008
- name: K Takehana
  role: author
- name: N Tsujii
  role: author
  orcid: https://orcid.org/0000-0002-6181-5911
- name: Y Imanaka
  role: author
- name: Y Matsushita
  role: author
  orcid: https://orcid.org/0000-0002-4968-8905
- name: H Abe
  role: author
- name: T Uchikoshi
  role: author
- name: H Yusa
  role: author

## Contact agent



## Publisher

organization: IOP Publishing

## Managing organization



## Keyword

- subject: magnetic frustration
  schema: not_defined
- subject: thermoremanent magnetization
  schema: not_defined
- subject: magnetic phase diagram
  schema: not_defined
- subject: quantum critical point
  schema: not_defined

## Rights

- description: This is an author-created, un-copyedited version of an article accepted
    for publication/published in JOURNAL OF PHYSICS-CONDENSED MATTER. IOP Publishing
    Ltd is not responsible for any errors or omissions in this version of the manuscript
    or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-648X/ad12fc.
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



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## Embargo



## Journal

- title: JOURNAL OF PHYSICS-CONDENSED MATTER
  issn: 1361648X
  volume: '36'
  issue: '12'
  start_page: 125801
  end_page: 125801

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  content_type: application/pdf
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