Magnetoelastic effects in the metallic frustrated antiferromagnet CrB$_2$
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866914599291322368 |
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| author | Watanabe, Tadataka Watanabe, Mai Suganuma, Sakurako Bauer, Andreas Pfleiderer, Christian |
| author_facet | Watanabe, Tadataka Watanabe, Mai Suganuma, Sakurako Bauer, Andreas Pfleiderer, Christian |
| contents | Hexagonal chromium diboride CrB$_2$ is a metallic frustrated antiferromagnet with a Néel temperature $T_N \sim$ 88 K. In CrB$_2$, Cr 3$d$ electrons not only give rise to localized magnetic moments but also contribute to metallic conduction. We perform ultrasound velocity measurements on a single crystal of hexagonal CrB$_2$ to determine its elastic properties. The temperature dependence of the $ab$-plane shear elastic modulus exhibits Curie-type softening upon cooling from $\sim$120 K down to $T_N$. This behavior is interpreted as a precursor to a symmetry-lowering lattice distortion at $T_N$, indicating that magnetic frustration is relieved via transverse magnetoelastic coupling. In addition, the $a$-axis and $c$-axis compressive elastic moduli show unusual softness and their suppression upon cooling, which are naturally explained by Fermi-surface nesting and its suppression upon cooling. The present results suggest that, in CrB$_2$, longitudinal magnetoelastic coupling suppresses Fermi-surface nesting and enhances frustrated exchange interactions, while transverse magnetoelastic coupling plays a key role in relieving the frustration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_25564 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Magnetoelastic effects in the metallic frustrated antiferromagnet CrB$_2$ Watanabe, Tadataka Watanabe, Mai Suganuma, Sakurako Bauer, Andreas Pfleiderer, Christian Strongly Correlated Electrons Materials Science Hexagonal chromium diboride CrB$_2$ is a metallic frustrated antiferromagnet with a Néel temperature $T_N \sim$ 88 K. In CrB$_2$, Cr 3$d$ electrons not only give rise to localized magnetic moments but also contribute to metallic conduction. We perform ultrasound velocity measurements on a single crystal of hexagonal CrB$_2$ to determine its elastic properties. The temperature dependence of the $ab$-plane shear elastic modulus exhibits Curie-type softening upon cooling from $\sim$120 K down to $T_N$. This behavior is interpreted as a precursor to a symmetry-lowering lattice distortion at $T_N$, indicating that magnetic frustration is relieved via transverse magnetoelastic coupling. In addition, the $a$-axis and $c$-axis compressive elastic moduli show unusual softness and their suppression upon cooling, which are naturally explained by Fermi-surface nesting and its suppression upon cooling. The present results suggest that, in CrB$_2$, longitudinal magnetoelastic coupling suppresses Fermi-surface nesting and enhances frustrated exchange interactions, while transverse magnetoelastic coupling plays a key role in relieving the frustration. |
| title | Magnetoelastic effects in the metallic frustrated antiferromagnet CrB$_2$ |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2605.25564 |