Magnetic-field-induced critical dynamics in magnetoelectric TbPO$_4$
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910680922193920 |
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| author | Grams, Christoph P. Grüninger, Markus Hemberger, Joachim |
| author_facet | Grams, Christoph P. Grüninger, Markus Hemberger, Joachim |
| contents | We report on the magnetoelectric dynamics in the linear magnetoelectric antiferromagnet TbPO$_4$ studied by broadband dielectric spectroscopy. For the phase transition into the magnetoelectric antiferromagnetic phase at $T_{N} \approx 2.3$ K, a finite magnetic field $H$ induces critical behavior in the quasi-static permittivity $\varepsilon'$. Plotting the corresponding anomaly as function of $T/T_N(H)$, we observe the scaling behavior $Δ\varepsilon' \propto H^2$, a clear fingerprint of linear magnetoelectric antiferromagnets. Above the phase transition, we find a critical slowing down of the ferroic fluctuations in finite magnetic field. This behaviour can be understood via a magnetic-field-induced relaxational response that resembles the soft-mode behaviour in canonical ferroelectrics and multiferroics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_00726 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Magnetic-field-induced critical dynamics in magnetoelectric TbPO$_4$ Grams, Christoph P. Grüninger, Markus Hemberger, Joachim Strongly Correlated Electrons We report on the magnetoelectric dynamics in the linear magnetoelectric antiferromagnet TbPO$_4$ studied by broadband dielectric spectroscopy. For the phase transition into the magnetoelectric antiferromagnetic phase at $T_{N} \approx 2.3$ K, a finite magnetic field $H$ induces critical behavior in the quasi-static permittivity $\varepsilon'$. Plotting the corresponding anomaly as function of $T/T_N(H)$, we observe the scaling behavior $Δ\varepsilon' \propto H^2$, a clear fingerprint of linear magnetoelectric antiferromagnets. Above the phase transition, we find a critical slowing down of the ferroic fluctuations in finite magnetic field. This behaviour can be understood via a magnetic-field-induced relaxational response that resembles the soft-mode behaviour in canonical ferroelectrics and multiferroics. |
| title | Magnetic-field-induced critical dynamics in magnetoelectric TbPO$_4$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2312.00726 |