تقرير
Diffuse spin waves, zero modes and cluster excitations in the spin-3/2 kagom\'e antiferromagnet chromium jarosite, KCr$_3$(OD)$_6$(SO$_4$)$_2$
| العنوان: | Diffuse spin waves, zero modes and cluster excitations in the spin-3/2 kagom\'e antiferromagnet chromium jarosite, KCr$_3$(OD)$_6$(SO$_4$)$_2$ |
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| المؤلفون: | Holm-Janas, Sofie, Lolk, Sidse L., Andersen, Anders B. A., Guidi, Tatiana, Voneshen, David, Zivkovic, Ivica, Nielsen, Ulla Gro, Lefmann, Kim |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | The dynamics of the S = 3=2 kagome antiferromagnet chromium jarosite, KCr$_3$(OD)$_6$(SO$_4$)$_2$ was studied using high-resolution neutron time-of-flight spectroscopy on a polycrystalline sample with a nearly stoichiometric magnetic lattice (2.8(2)% Cr vacancies). Neutron spectroscopy reveals diffuse spin wave excitations in the ordered phase with an incomplete gap and significant finite life-time broadening as well as a pronounced zero mode. Using linear spin wave theory, we estimate the exchange couplings, with the leading nearest neighbor value being $J_1$ = 0:884 meV. Above $T_N$ diffuse excitations from cooperative paramagnetism dominate. A model for two-dimensional magnetic cluster excitations is shown to capture the essential features of the data in the cooperative paramagnetic phase. Comment: 24 pages, 11 figures. 6 pages supplementary information |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2206.07330 |
| رقم الأكسشن: | edsarx.2206.07330 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |