Strong Magneto-Elastic Coupling in Mn$_3$X (X = Ge, Sn)
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866916429787299840 |
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| author | Theuss, Florian Ghosh, Sayak Chen, Taishi Tchernyshyov, Oleg Nakatsuji, Satoru Ramshaw, B. J. |
| author_facet | Theuss, Florian Ghosh, Sayak Chen, Taishi Tchernyshyov, Oleg Nakatsuji, Satoru Ramshaw, B. J. |
| contents | We measure the full elastic tensors of Mn$_3$Ge and Mn$_3$Sn as a function of temperature through their respective antiferromagnetic phase transitions. Large discontinuities in the bulk moduli at the Néel transitions indicate strong magnetoelastic coupling in both compounds. Strikingly, the discontinuities are nearly a factor of 10 larger in Mn$_3$Ge than in Mn$_3$Sn. We use the magnitudes of the discontinuities to calculate the pressure derivatives of the Néel temperature, which are 39 K/GPa 14.3 K/GPa for Mn$_3$Ge and Mn$_3$Sn, respectively. We measured in-plane shear modulus $c_{66}$, which couples strongly to the magnetic order, in magnetic fields up to 18 T and found quantitatively similar behavior in both compounds. Recent measurements have demonstrated strong piezomagnetism in Mn$_3$Sn: our results suggest that Mn$_3$Ge may be an even better candidate for this effect. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2203_06650 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Strong Magneto-Elastic Coupling in Mn$_3$X (X = Ge, Sn) Theuss, Florian Ghosh, Sayak Chen, Taishi Tchernyshyov, Oleg Nakatsuji, Satoru Ramshaw, B. J. Strongly Correlated Electrons We measure the full elastic tensors of Mn$_3$Ge and Mn$_3$Sn as a function of temperature through their respective antiferromagnetic phase transitions. Large discontinuities in the bulk moduli at the Néel transitions indicate strong magnetoelastic coupling in both compounds. Strikingly, the discontinuities are nearly a factor of 10 larger in Mn$_3$Ge than in Mn$_3$Sn. We use the magnitudes of the discontinuities to calculate the pressure derivatives of the Néel temperature, which are 39 K/GPa 14.3 K/GPa for Mn$_3$Ge and Mn$_3$Sn, respectively. We measured in-plane shear modulus $c_{66}$, which couples strongly to the magnetic order, in magnetic fields up to 18 T and found quantitatively similar behavior in both compounds. Recent measurements have demonstrated strong piezomagnetism in Mn$_3$Sn: our results suggest that Mn$_3$Ge may be an even better candidate for this effect. |
| title | Strong Magneto-Elastic Coupling in Mn$_3$X (X = Ge, Sn) |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2203.06650 |