Spin Dynamics and Light-Induced Effects in EuZn$_2$P$_2$
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Dutra, M. Vasques, G. G. Sabino, P. C. Dias, J. G. Oliveira, J. F. Heringer, M. A. A. Cabrera-Baez, M. Baggio-Saitovitch, E. Benvenho, A. R. V. Avila, M. A. Munevar, J. |
| author_facet | Dutra, M. Vasques, G. G. Sabino, P. C. Dias, J. G. Oliveira, J. F. Heringer, M. A. A. Cabrera-Baez, M. Baggio-Saitovitch, E. Benvenho, A. R. V. Avila, M. A. Munevar, J. |
| contents | The magnetic spin dynamics and optical properties of EuZn$_2$P$_2$ are studied. Single crystals grown by the Sn-flux method crystallize in the $P\overline{3}m1$ (No.~164) space group and order antiferromagnetically at $T_N=23.5$~K. $^{151}$Eu Mössbauer spectroscopy confirms the presence of the Eu$^{2+}$ oxidation state only and the magnetic moment angle relative to the $c$-axis is $θ=46(3)$\textdegree. Temperature-dependent electron spin resonance (ESR) measurements reveal that spin-spin interactions predominantly govern the spin relaxation mechanisms, as evidenced by the linewidth behavior ($ΔH$). Positive $g$-shifts ($Δg)$ for $H \parallel ab$ indicate the presence of local electron polarization. The ESR data support the formation of anisotropic magnetic polarons, which trap spin carriers and contribute to increased electrical resistance. Angular-dependent ESR spectra at room temperature display anisotropic behavior in both $Δg(ϕ)$ and $ΔH(ϕ)$, with a dominant three-dimensional component $C_{3D}$, indicative of robust interlayer coupling and antiferromagnetic fluctuations. Under light illumination, a small broadening of $ΔH$ is observed. Furthermore, a photovoltaic effect is identified in EuZn$_2$P$_2$, with photodetector performance metrics suggesting promising capabilities for future optoelectronic devices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_07681 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Spin Dynamics and Light-Induced Effects in EuZn$_2$P$_2$ Dutra, M. Vasques, G. G. Sabino, P. C. Dias, J. G. Oliveira, J. F. Heringer, M. A. A. Cabrera-Baez, M. Baggio-Saitovitch, E. Benvenho, A. R. V. Avila, M. A. Munevar, J. Strongly Correlated Electrons The magnetic spin dynamics and optical properties of EuZn$_2$P$_2$ are studied. Single crystals grown by the Sn-flux method crystallize in the $P\overline{3}m1$ (No.~164) space group and order antiferromagnetically at $T_N=23.5$~K. $^{151}$Eu Mössbauer spectroscopy confirms the presence of the Eu$^{2+}$ oxidation state only and the magnetic moment angle relative to the $c$-axis is $θ=46(3)$\textdegree. Temperature-dependent electron spin resonance (ESR) measurements reveal that spin-spin interactions predominantly govern the spin relaxation mechanisms, as evidenced by the linewidth behavior ($ΔH$). Positive $g$-shifts ($Δg)$ for $H \parallel ab$ indicate the presence of local electron polarization. The ESR data support the formation of anisotropic magnetic polarons, which trap spin carriers and contribute to increased electrical resistance. Angular-dependent ESR spectra at room temperature display anisotropic behavior in both $Δg(ϕ)$ and $ΔH(ϕ)$, with a dominant three-dimensional component $C_{3D}$, indicative of robust interlayer coupling and antiferromagnetic fluctuations. Under light illumination, a small broadening of $ΔH$ is observed. Furthermore, a photovoltaic effect is identified in EuZn$_2$P$_2$, with photodetector performance metrics suggesting promising capabilities for future optoelectronic devices. |
| title | Spin Dynamics and Light-Induced Effects in EuZn$_2$P$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2506.07681 |