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Two-stage evolution of magnetic correlations in the spiral spin liquid material Ca10Cr7O28

We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca10⁢Cr7⁢O28, which constitutes alternating antiferromagnetic and ferromagnetic kagome bilayers. At high temperatures, a phonon-assisted relaxation process is evoked to account for...

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Main Authors: Koo, Changhyun (Author) , Park, Jaena (Author) , Werner, Johannes (Author) , Lee, Suheon (Author) , Balz, Christian (Author) , Islam, A. T. M. Nazmul (Author) , Oshima, Yugo (Author) , Lake, Bella (Author) , Choi, Kwang-Yong (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 2025
In: Physical review
Year: 2025, Volume: 111, Issue: 12, Pages: 125144-1 - 125144-7
ISSN:2469-9969
DOI:10.1103/PhysRevB.111.125144
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevB.111.125144
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.111.125144
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Author Notes:Changhyun Koo, Jaena Park, Johannes Werner, Suheon Lee, Christian Balz, A. T. M. Nazmul Islam, Yugo Oshima, Bella Lake, Kwang-Yong Choi, and Rüdiger Klingeler
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Summary:We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca10⁢Cr7⁢O28, which constitutes alternating antiferromagnetic and ferromagnetic kagome bilayers. At high temperatures, a phonon-assisted relaxation process is evoked to account for the pronounced increase of the linewidth in an exchange-narrowing regime (𝑘B⁢𝑇≫𝐽). In contrast, at low temperatures (𝑘B⁢𝑇≲𝐽), a power-law behavior in line narrowing is observed. Our data reveal two distinct power-law regimes for the linewidth which crossover at 𝑇*≈7.5K. Notably, the intriguing evolution of the ESR linewidth in this alternating kagome bilayer system with opposite sign of exchange interactions highlights distinct spin dynamics compared to those in a uniform kagome antiferromagnet.
Item Description:Die Ziffern im Titel sind tiefgestellt
Online veröffentlicht: 19. März 2025
Gesehen am 05.11.2025
Physical Description:Online Resource
ISSN:2469-9969
DOI:10.1103/PhysRevB.111.125144

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