Ramification of complex magnetism in Nd$_2$Ir$_2$O$_7$ observed by Raman scattering spectroscopy
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| Auteurs principaux: | , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913581306478592 |
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| author | Xu, Yuanyuan Yang, Yang Teyssier, Jérémie Ohtsuki, Takumi Qiu, Yang Nakatsuji, Satoru van der Marel, Dirk Perkins, Natalia B. Drichko, Natalia |
| author_facet | Xu, Yuanyuan Yang, Yang Teyssier, Jérémie Ohtsuki, Takumi Qiu, Yang Nakatsuji, Satoru van der Marel, Dirk Perkins, Natalia B. Drichko, Natalia |
| contents | Using Raman scattering spectroscopy, we uncover a complex magnetic behavior of Nd$_2$Ir$_2$O$_7$ , which stands out among magnetic pyrochlores by the lowest temperature of the all-in-all-out (AIAO) Ir moments ordering ($T^\mathrm{N}_{\small\rm{Ir}}=33$~K) and the highest temperature at which AIAO order of rare-earth Nd ions is detected ($T^\mathrm{*}_{\small\rm{Nd}}$=15~K). Our findings suggest that in the temperature range between 15~K and 33~K, Nd magnetic moments exhibit strong fluctuations, possibly originating from spin ice behavior. This complex behavior emerges from the interplay of strong spin-orbit coupling, electronic correlations, and geometric frustration on two magnetic pyrochlore sublattices of Nd and Ir ions. The ordering of Ir magnetic moments is accompanied by an appearance of one-magnon Raman modes at 26.3 and 29.6 meV compatible with the AIAO order and of a broad mode at 14 meV, which could be associated with spinon continuum arising from Nd spin ice fluctuations. While two one-magnon excitations show minimal temperature evolution with decreasing temperature, the 14 meV mode shifts to higher frequencies as the temperature approaches a crossover to Nd AIAO order, broadens, and disappears below 15~K. An additional two-magnon excitation of the AIAO Nd order at around 33 meV appears in the spectra at low temperatures. These rather high energies of magnetic excitations of Nd moments make Nd$_2$Ir$_2$O$_7$ a particularly attractive playground to study the rare-earth magnetism on the pyrochlore lattice. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_00579 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Ramification of complex magnetism in Nd$_2$Ir$_2$O$_7$ observed by Raman scattering spectroscopy Xu, Yuanyuan Yang, Yang Teyssier, Jérémie Ohtsuki, Takumi Qiu, Yang Nakatsuji, Satoru van der Marel, Dirk Perkins, Natalia B. Drichko, Natalia Strongly Correlated Electrons Using Raman scattering spectroscopy, we uncover a complex magnetic behavior of Nd$_2$Ir$_2$O$_7$ , which stands out among magnetic pyrochlores by the lowest temperature of the all-in-all-out (AIAO) Ir moments ordering ($T^\mathrm{N}_{\small\rm{Ir}}=33$~K) and the highest temperature at which AIAO order of rare-earth Nd ions is detected ($T^\mathrm{*}_{\small\rm{Nd}}$=15~K). Our findings suggest that in the temperature range between 15~K and 33~K, Nd magnetic moments exhibit strong fluctuations, possibly originating from spin ice behavior. This complex behavior emerges from the interplay of strong spin-orbit coupling, electronic correlations, and geometric frustration on two magnetic pyrochlore sublattices of Nd and Ir ions. The ordering of Ir magnetic moments is accompanied by an appearance of one-magnon Raman modes at 26.3 and 29.6 meV compatible with the AIAO order and of a broad mode at 14 meV, which could be associated with spinon continuum arising from Nd spin ice fluctuations. While two one-magnon excitations show minimal temperature evolution with decreasing temperature, the 14 meV mode shifts to higher frequencies as the temperature approaches a crossover to Nd AIAO order, broadens, and disappears below 15~K. An additional two-magnon excitation of the AIAO Nd order at around 33 meV appears in the spectra at low temperatures. These rather high energies of magnetic excitations of Nd moments make Nd$_2$Ir$_2$O$_7$ a particularly attractive playground to study the rare-earth magnetism on the pyrochlore lattice. |
| title | Ramification of complex magnetism in Nd$_2$Ir$_2$O$_7$ observed by Raman scattering spectroscopy |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2302.00579 |