تقرير
Multiferroicity and magneto-electric effect in Gd$_2$BaNiO$_5$
| العنوان: | Multiferroicity and magneto-electric effect in Gd$_2$BaNiO$_5$ |
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| المؤلفون: | Chowki, S., Basu, Tathamay, Singh, K., Mohapatra, N., Sampathkumaran, E. V. |
| المصدر: | J. Appl. Phys. 115, 214107 (2014) |
| سنة النشر: | 2014 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | We report the observation of electric polarization in the magnetically ordered state of the Haldane chain compound, Gd$_2$BaNiO$_5$, with strongly correlated magnetic and dielectric properties. The results of dc magnetic susceptibility and heat capacity measurements indicate two magnetic transitions,one corresponding to the anti-ferromagnetic order at T$_N$ around 55 K and the other to spin-reorientation transition at T$_{SR}$ around 24 K. The dielectric permittivity ($\epsilon'$) and loss (tan$\delta$) also exhibit anomalies in the vicinity of T$_{SR}$ and T$_N$ respectively. Below the spin-reorientation transition, concurrently magnetic-field-induced spin-flop and the meta-electric transitions are observed at a critical magnetic field in isothermal magnetization and magneto-dielectric results respectively. Another interesting finding is that the change in dielectric constant changes its sign at the critical magnetic field. The origin of the observed magneto-electric effect is discussed on the basis of spin-phonon coupling. Comment: published in JAP |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/1.4881531 |
| URL الوصول: | http://arxiv.org/abs/1407.5307 |
| رقم الأكسشن: | edsarx.1407.5307 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/1.4881531 |
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