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Description:

Yttrium and rare-earth iron garnets (R3Fe5O12) are ferrimagnetic insulators that have been widely studied for magnetic and spintronic applications. In this study, we report the thermal conductivity (κ) between 300 and 773 K for the single crystals of R3Fe5O12, where R = Y, Gd, Dy, and Yb. For Y3Fe5O12, the κ up to the Curie temperature (TC ≈ 555 K) can be described well with a pure phononic model, without considering conduction or scattering by the magnons. The iron garnets containing magnetic rare-earth ions exhibit smaller κ, with Dy3Fe5O12 showing the smallest values due to the strong interactions of heat-carrying phonons with the crystal field excitations of Dy3+ ions.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: thermal conductivity, heat capacity, iron garnets, single crystal, phonon, magnon

Date published: 2025-10-06

Publisher: IOP Publishing

Journal:

• Journal of Physics: Condensed Matter (ISSN: 09538984) vol. 37 issue. 40 405401

Funding:

• JST-Mirai JPMJMI19A1

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1088/1361-648x/ae09e6

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Updated at: 2025-10-21 16:05:59 +0900

Published on MDR: 2025-10-21 15:43:22 +0900