Magnetic Order and Magneto-Elasticity in the Electronic Excitations of Gd-$i$-MAX
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
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2024
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| author | Panda, Kartik Potashnikov, Daniel Pesach, Asaf Barbier, Maxime Eyal, Anna Ouisse, Thierry Keren, Amit Bachar, Nimrod |
| author_facet | Panda, Kartik Potashnikov, Daniel Pesach, Asaf Barbier, Maxime Eyal, Anna Ouisse, Thierry Keren, Amit Bachar, Nimrod |
| contents | We report the investigation of electronic collective modes in rare-earth-based magnets (Mo$_{2/3}$RE$_{1/3}$)$_2$AlC (also known as RE-$i$-MAX phases), where RE=Gd, Yb, and Dy, using single crystal samples. A detailed investigation of the Raman spectra of Gd-$i$-MAX samples at low temperatures, with a focus on the phonon behavior in relation to the antiferromagnetic (AFM) phase transition at 26 K is presented. Significant shifts in the central frequencies of several low-frequency phonon modes were observed below 25 K, correlating with the Néel transition. Integrated Raman intensity measurements indicated a reduction in the electronic background below the AFM transition temperature, suggesting the opening of a magnetic gap. Our analysis showed no new phonon modes. Therefore, we do not see any indication of a Brillouin zone folding of phonon mode to the $Γ$-point in our measurement. However, the hardening of all phonon modes at low temperatures points to a strong spin-phonon coupling effect. Using a temperature-dependent model of phonon frequency, we determined the spin-phonon coupling constant $λ$ to be less than 0.1 cm$^{-1}$ for all frequencies, which is of the same order of magnitude as found in other antiferromagnetic materials such as MnF$_{2}$ and FeF$_{2}$ with $T_N=68~K$ and $T_N=78~K$, respectively, but significantly lower than that of $CuO$ with $T_N=213~K$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_02436 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic Order and Magneto-Elasticity in the Electronic Excitations of Gd-$i$-MAX Panda, Kartik Potashnikov, Daniel Pesach, Asaf Barbier, Maxime Eyal, Anna Ouisse, Thierry Keren, Amit Bachar, Nimrod Strongly Correlated Electrons We report the investigation of electronic collective modes in rare-earth-based magnets (Mo$_{2/3}$RE$_{1/3}$)$_2$AlC (also known as RE-$i$-MAX phases), where RE=Gd, Yb, and Dy, using single crystal samples. A detailed investigation of the Raman spectra of Gd-$i$-MAX samples at low temperatures, with a focus on the phonon behavior in relation to the antiferromagnetic (AFM) phase transition at 26 K is presented. Significant shifts in the central frequencies of several low-frequency phonon modes were observed below 25 K, correlating with the Néel transition. Integrated Raman intensity measurements indicated a reduction in the electronic background below the AFM transition temperature, suggesting the opening of a magnetic gap. Our analysis showed no new phonon modes. Therefore, we do not see any indication of a Brillouin zone folding of phonon mode to the $Γ$-point in our measurement. However, the hardening of all phonon modes at low temperatures points to a strong spin-phonon coupling effect. Using a temperature-dependent model of phonon frequency, we determined the spin-phonon coupling constant $λ$ to be less than 0.1 cm$^{-1}$ for all frequencies, which is of the same order of magnitude as found in other antiferromagnetic materials such as MnF$_{2}$ and FeF$_{2}$ with $T_N=68~K$ and $T_N=78~K$, respectively, but significantly lower than that of $CuO$ with $T_N=213~K$. |
| title | Magnetic Order and Magneto-Elasticity in the Electronic Excitations of Gd-$i$-MAX |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2408.02436 |