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Two-stage evolution of magnetic correlations in spiral spin liquid material, Ca\\(_10\\)Cr\\(_7\\)O\\(_28\\)
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Two-stage evolution of magnetic correlations in spiral spin liquid material, Ca\\(_10\\)Cr\\(_7\\)O\\(_28\\)
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Paper
Two-stage evolution of magnetic correlations in spiral spin liquid material, Ca\\(_10\\)Cr\\(_7\\)O\\(_28\\)
2025
Overview
We present an X-band and tunable high-frequency/high-field electron spin resonance (HF-ESR) study of single-crystalline Ca\\(_10\\)Cr\\(_7\\)O\\(_28\\), 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 (\\(k_ BT J\\)). In contrast, at low temperatures (\\(k_ BT 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^* 7.5\\)~K. 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.
Publisher
Cornell University Library, arXiv.org
