Academic Journal
Fe-57 Mossbauer study of unusual magnetic structure of multiferroic 3R-AgFeO2
| العنوان: | Fe-57 Mossbauer study of unusual magnetic structure of multiferroic 3R-AgFeO2 |
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| المؤلفون: | Sobolev, A., Rusakov, V., Moskvin, A., Gapochka, A., Belik, A., Glazkova, I., Akulenko, A., Demazeau, G., Presniakov, I. |
| المصدر: | J Phys Condens Matter ; Journal of Physics Condensed Matter |
| بيانات النشر: | Institute of Physics Publishing |
| سنة النشر: | 2017 |
| المجموعة: | Ural Federal University (URFU): ELAR / Уральский федеральный университет: электронный архив УрФУ |
| مصطلحات موضوعية: | ANISOTROPIC HYPERFINE MAGNETIC INTERACTIONS, FRUSTRATED MAGNETIC INTERACTIONS, MAGNETOSTRUCTURAL PHASE TRANSITIONS, MULTIFERROICS, MÖSSBAUER SPECTROSCOPY, NON-COLLINEAR SPIN CONFIGURATIONS, ANISOTROPY, DENSITY (OPTICAL), IRON OXIDES, MAGNETIC STRUCTURE, SPIN DENSITY WAVES, SPIN FLUCTUATIONS, SYNTHETIC METALS, TEMPERATURE DISTRIBUTION, MAGNETIC INTERACTIONS, MAGNETOSTRUCTURAL PHASE TRANSITION, SPIN CONFIGURATIONS, SSBAUER SPECTROSCOPIES, MAGNETISM |
| الوصف: | We report new results of a 57Fe Mössbauer study of hyperfine magnetic interactions in the layered multiferroic 3R-AgFeO2 demonstrating two magnetic phase transitions at T N1 and T N2. The asymptotic value β ∗ ≈ 0.34 for the critical exponent obtained from the temperature dependence of the hyperfine field H hf(T) at 57Fe the nuclei below T N1 ≈ 14 K indicates that 3R-AgFeO2 shows quasi-3D critical behavior. The spectra just above T N1 (T N1 < T < T ∗ ≈ 41 K) demonstrate a relaxation behavior due to critical spin fluctuations which indicates the occurrence of short-range correlations. At the intermediate temperature range, T N2 < T < T N1, the 57Fe Mössbauer spectra are described in terms of collinear spin-density-waves (SDW) with the inclusion of many high-order harmonics, indicating that the real magnetic structure of the ferrite appears to be more complicated than a pure sinusoidally modulated SDW. Below T < T N2 ≈ 9 K, the hyperfine field H hf reveals a large spatial anisotropy (ΔH anis ≈ 30 kOe) which is related with a local intra-cluster (FeO6) spin-dipole term that implies a conventional contribution of the polarized oxygen ions. We proposed a simple two-parametric formula to describe the dependence of H anis on the distortions of the (FeO6) clusters. Analysis of different mechanisms of spin and hyperfine interactions in 3R-AgFeO2 and its structural analogue CuFeO2 points to a specific role played by the topology of the exchange coupling and the oxygen polarization in the delafossite-like structures. © 2017 IOP Publishing Ltd. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | Fe-57 Mossbauer study of unusual magnetic structure of multiferroic 3R-AgFeO2 / A. Sobolev, V. Rusakov, A. Moskvin, et al. — DOI 10.1088/1361-648X/aa70ae // Journal of Physics Condensed Matter. — 2017. — Vol. 29. — Iss. 27. — 275803.; 9538984; Final; All Open Access, Green; https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020499750&doi=10.1088%2f1361-648X%2faa70ae&partnerID=40&md5=fd71508d81a17dfb2a674e0143799902; http://arxiv.org/pdf/1612.08926; http://elar.urfu.ru/handle/10995/102119; 85020499750 |
| DOI: | 10.1088/1361-648X/aa70ae |
| الاتاحة: | http://elar.urfu.ru/handle/10995/102119 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020499750&doi=10.1088%2f1361-648X%2faa70ae&partnerID=40&md5=fd71508d81a17dfb2a674e0143799902 http://arxiv.org/pdf/1612.08926 https://doi.org/10.1088/1361-648X/aa70ae |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.216A29AF |
| قاعدة البيانات: | BASE |
| DOI: | 10.1088/1361-648X/aa70ae |
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