Lattice dynamics and spin-phonon coupling in the kagome spin ice HoAgGe
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866916646743965696 |
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| author | Wu, Shangfei Zhao, Lingxiao Song, Wei Tan, Mingshu Jin, Feng Ying, Tianping Yin, Jia-Xin Zhang, Qingming |
| author_facet | Wu, Shangfei Zhao, Lingxiao Song, Wei Tan, Mingshu Jin, Feng Ying, Tianping Yin, Jia-Xin Zhang, Qingming |
| contents | We employ polarization-resolved Raman spectroscopy and first-principles phonon calculations to study the lattice dynamics and spin-phonon coupling in the kagome spin ice compound HoAgGe. Upon cooling, HoAgGe shows transitions from a nonmagnetic state at 300 K to a partially magnetic-ordered phase below T2 = 11.6 K, eventually reaching a fully-magnetic ordered phase below T1 = 7 K. We detect eight of ten Raman-active phonon modes at room temperature, with frequencies consistent with first-principles phonon calculations. We find that the low-energy phonon modes harden upon cooling, soften slightly below T2, and finally harden again below T1, suggesting finite spin-phonon coupling in HoAgGe. Furthermore, one high-energy mode at 185 cm-1 with E' symmetry exhibits a Fano lineshape due to electron-phonon coupling. Our Raman results establish finite spin-phonon coupling and electron-phonon coupling in the magnetic phase of HoAgGe, providing a foundation for future studies of the novel field-induced phases at low temperatures in HoAgGe. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_15528 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Lattice dynamics and spin-phonon coupling in the kagome spin ice HoAgGe Wu, Shangfei Zhao, Lingxiao Song, Wei Tan, Mingshu Jin, Feng Ying, Tianping Yin, Jia-Xin Zhang, Qingming Strongly Correlated Electrons Materials Science We employ polarization-resolved Raman spectroscopy and first-principles phonon calculations to study the lattice dynamics and spin-phonon coupling in the kagome spin ice compound HoAgGe. Upon cooling, HoAgGe shows transitions from a nonmagnetic state at 300 K to a partially magnetic-ordered phase below T2 = 11.6 K, eventually reaching a fully-magnetic ordered phase below T1 = 7 K. We detect eight of ten Raman-active phonon modes at room temperature, with frequencies consistent with first-principles phonon calculations. We find that the low-energy phonon modes harden upon cooling, soften slightly below T2, and finally harden again below T1, suggesting finite spin-phonon coupling in HoAgGe. Furthermore, one high-energy mode at 185 cm-1 with E' symmetry exhibits a Fano lineshape due to electron-phonon coupling. Our Raman results establish finite spin-phonon coupling and electron-phonon coupling in the magnetic phase of HoAgGe, providing a foundation for future studies of the novel field-induced phases at low temperatures in HoAgGe. |
| title | Lattice dynamics and spin-phonon coupling in the kagome spin ice HoAgGe |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2502.15528 |